EP2206865B1 - Method for operating a door drive with overload protection and door drives equipped with same - Google Patents

Description

The invention relates to a method for overload protection of a door drive in order to avoid a thermal overload, and thus equipped door drives.

Door drives have motors, by means of which they are able to move a respectively connected door leaf, at least in the opening direction. In this case, door operators experience a thermal load when they are inspected by persons. Ambient temperature, set parameters on the door drive as well as the load from the normally-integrated normally-open springs in door drives can also overload the system.

Methods for overload protection of electrical devices are well known in the art. In order to avoid a thermal overload of the electrical device, thermal switches are known, which turn off the electrical device at least temporarily on reaching a certain temperature. If the electrical device cools down again, the device is usually put back into operation by the thermal switch. Such thermal switches may for example be formed of a bimetal, which triggers a switching operation due to temperature-induced deformation.

Furthermore, electrical devices are known, which are designed with a temperature sensor, so that a control constant monitoring of the temperature, for example in the electronics or in an electrical drive unit of the electrical device monitored. If a maximum permissible temperature is reached, the control switches off the drive unit, for example.
Such methods for thermal overload protection of electrical devices have the disadvantage that the electrical device is temporarily put out of operation. Furthermore, the electrical device is always switched off only when a limit temperature has already been reached or exceeded. The result is a necessary cooling time during which the electrical device can not be operated. If a thermal switch or a controller with a temperature sensor used for temperature monitoring in a door drive, it is particularly disadvantageous when the door drive must be at least temporarily disabled to avoid thermal overload. The disadvantages mentioned also occur in a door drive, provided that it is equipped with a conventional overload protection.
For example, it is off WO2005 / 021914A1 Such a generic method known.
It is therefore the object of the present invention to provide an improved method for operating a door drive with an overload protection.

This object is achieved by means of a method for operating a door drive according to claim 1 and a door drive according to claim 12. Advantageous developments of the invention are specified in the dependent claims.

The invention includes the technical teaching that for carrying out the method for overload protection of a door drive a electrical control is provided which receives the actual values of several operating parameters of the door drive in a step in a step and compares the recorded actual values of the operating parameters with an associated comparison value of the respective operating parameter in a subsequent step to determine a load height of the door drive. In this case, the continued operation of the door drive in a next step in response to the load height is adjusted by the controller so that a thermal overload of the door drive is avoided. As a result, an adaptation of the further operation already takes place at a time when the door drive has become warm, but not yet overheated. Ie. The door drive can be operated safely for much longer despite thermal stress.

The invention is based on the idea that the controller carries out a preferably continuous or periodic monitoring of the operating parameters of the door drive. The monitoring of several operating parameters takes place simultaneously. By monitoring a plurality of operating parameters, a load field is determined, wherein the more precisely determinable load forms a load level due to the operating parameters. For example, external operating parameters such as the ambient temperature and internal operating parameters such as the frequency of operation of the door drive individually can not form a limit load, but an accumulation of the individual loads can cause the achievement of an allowable limit load. Depending on the determined load height of the door drive is operated accordingly, the continued operation of the door drive is dynamically adjusted so that a thermal overload of the Door drive can be avoided. Will be a larger load height determined, there is a greater adaptation of the continued operation of the door drive to the larger load height, with a low load height, the adjustment of the continued operation of the door drive can be correspondingly low. This adaptation is made possible by the control by which the method according to the invention for overload protection of a door drive is carried out. Preferably, the method further comprises a step of measuring a temperature in the door drive, the temperature forming a first operating parameter. The door drive has a temperature sensor that measures the temperature in the door drive. To measure the temperature in the door drive several temperature sensors can be arranged at different locations in the door drive. For example, the measurement of the temperature of the drive motor is just as possible as the measurement of the temperature in the power supply or in the controller. However, it is of particular advantage to equip the door drive with only a single temperature sensor, which is placed at a suitable location in the door drive at which a representative measurement of the temperature in the door drive is made possible. At a correspondingly high temperature, there is consequently a high load level, which falls proportionately back to the first operating parameter, namely the high temperature.
A further increase in the load level can result from the Begehungsfrequenz the actuatable by the door drive door. Advantageously, therefore, the controller is formed in a step for detecting the Begehungsfrequenz of the door drive, wherein the Begehungsfrequenz forms a second operating parameter. The absolute load level thus results from a sum of the load level by the first operating parameter and the load level by the second operating parameter. For example, the total load level especially large when there is a high Begehungsfrequenz the door drive at a high temperature.

The method may further comprise additional steps of operating an electric motor of the door operator with a motor current and detecting the motor current, wherein the motor current forms a third operating parameter for determining the load level. Ie. The door operator has an electric motor which is operated with motor current. The controller is preferably designed to detect the motor current. For example, high wind forces can act on the door leaf of the door operated by the door drive, so that the door drive must work against the wind forces, which can also result in a higher load height of the door drive. However, a sluggishness of the door can cause an increase in the motor current, whereby the load level also increases. The result is an example of a total load height, which results from the operating parameters of the temperature, the Begehungsfrequenz and the motor current.

According to the invention, the adaptation of the further operation of the door drive by adjusting at least one output parameter of the door drive. The operation of a door operator offers several parameters that can be changed individually or together. The change of one or more output parameters can change the load height of the door drive. However, according to the invention, the door drive is not completely switched off, but only an adaptation of the or the output parameters of the door drive, so that the door operation can continue to take place and does not temporarily fail.

Preferably, the step of adjusting the at least one output parameter comprises a step of determining a respective one Adjustment value for the at least one output parameter based on the determined load level and a step of outputting the determined respective adjustment value for the at least one output parameter for controlling the respective element to be influenced.
The step of determining the respective adaptation value is advantageously carried out by reading out a mapping table on the basis of the recorded actual values. In the mapping table, predetermined actual values for operating parameters or actual value ranges for these operating parameters are assigned to respective adaptation values for output parameters of the door drive. Ie. The adjustment values to be output are read from the mapping table as a function of the comparison result between the recorded actual values and corresponding comparison values in the mapping table.
For example, it is advantageous if the torque of the closer shaft of the door drive forms a first output parameter. The door leaf is operatively connected to a closer shaft of the door drive, wherein the closer shaft performs a rotational movement in order to achieve pivoting of the door leaf. This results in a torque at the closer shaft, which can be adjusted as a first output parameter by the controller. With a dynamic limitation of a maximum torque of the closer shaft results in a lower acceleration of the moving masses, which are formed for example by the door leaf. Furthermore, during the opening movement, a closing spring must be tensioned, which also results in a portion of the torque on the closer shaft (the tensioning and relaxing of the closing spring does not necessarily take place via the closer shaft, but the movement introduced for this purpose in the closing spring movement analogous to a movement over the closer shaft can be understood). A limitation of the torque can be achieved for example by slowing down the opening movement of the door leaf, since the lower acceleration of the moving masses leads to a lower maximum torque in the closer shaft.

The delay or acceleration of the closing movement just before the final closing position of the door leaf by the electric motor can be reduced. In this case, a connection or disconnection of the motor support the closing movement can be adjusted as a second output parameter by the controller. If a large load height of the door drive is determined by the controller, the door drive can be converted into an operating mode in which the closing movement of the door leaf is effected exclusively by the closing spring.
It is also advantageous if preferably the door drive has a fan, wherein the operation of the fan is adjusted as a third output parameter. The fan in a door drive can be permanently in operation, but in a likewise permanently operated door drive wear, noise and power consumption of the fan are not desirable. If the controller detects only a small amount of load, the operation of the fan is not required. If the load height of the door drive increases, the operation of the fan can be adapted to the load height. In this case, the fan can either be switched on or off, wherein the fan can also have, for example, a plurality of operating points that can be adapted to the load level or the fan is set in accordance intermittently in operation.

The fan in the door drive can provide ventilation for the components in the door drive so that they can be cooled by air convection. Particularly advantageous is the arrangement of the temperature sensor in the vicinity of the fan, which may be designed as a suction fan, which blows warm air from the door drive. Consequently, the temperature sensor flows around the temperature sensor, which is sucked out of the door drive, so that an accurate determination of the fan temperature is made possible by the temperature sensor. In particular, the temperature sensor can be applied to a control module or to the control of the door drive. The arrangement of the temperature sensor is advantageously carried out such that a temperature in the door drive can be determined even without operation of the fan.

The method preferably further comprises a step of performing an opening movement of the door panel, and then a step of controlling an opening time of the door panel, wherein the open time of the door panel forms a fourth output parameter. Ie. the door drive preferably comprises a control, with which the open time of the door leaf is controlled after the opening movement of the door leaf. In particular, in the determination of a high Begehungsfrequenz and a correspondingly frequent activation of the door drive for pivoting the door leaf, an extension of the hold open time, a reduction in the number of door operations per time can be achieved while still maintaining a walk frequency. As a result, the load height of the door drive drops at least by a lower frequency of activation of the door drive.

It is of particular advantage if the adaptation of the output parameters by the controller is dependent on each other.

In this case, the adaptation can take place as a function of the respective actual value of the operating parameters.

For example, the third output parameter, namely the operation of the fan, preferably depending on the temperature detected by the temperature sensor in the door drive and thus in dependence on the first operating parameter, be adjusted.

Furthermore, a high bequest frequency as the second operating parameter may cause the holdover time to be adjusted as the fourth output parameter. In particular, however, each detected operating parameter can result in an adaptation of each individual output parameter.

The adaptation of an output parameter can influence actual values of other operating parameters. For example, an increase in the fan speed can cause the engine to be cooled and thus open and / or close again more often. In that case the hold-open time can be reduced again. Ie. In this case, the fan control influences the hold-open time and vice versa.

In the context of the present invention, the method is not limited to the present operating parameters to be detected and output parameters to be adapted. For example, several features of the door drive, such as the operation of a display for displaying information on the door drive can be adapted as further output parameters.

In the foreground of the adjustment of the output parameters is the continued operation of the door drive, a load field can be determined by means of which a load level can be determined, which is still to be achieved. Loading field in this context means a vector or a matrix with values of operating and / or Output parameters. If the controller determines a specific load point in the load field after it is expected that a maximum load level will be reached, the output parameters can be adjusted accordingly even before reaching the maximum load level, for example a maximum temperature. As a result, the continued operation of the door drive is ensured without first reaching a limit temperature in order to adjust an output parameter accordingly.
The present invention further relates to a door drive for a door with a controller, adapted to adapt at least one output parameter of the door drive as a function of the operating parameters by a method according to the type described above. The door drive has a temperature sensor on the output side with a data input coupled to the control of the door drive and also arranged in the door drive. The controller includes a time monitoring circuit for monitoring at least one time interval and logic for determining a number of inspections within the time interval. Ie. the controller begins at a time to count the inspections and additionally to determine the elapsed time. The controller also preferably evaluates how many inspections have taken place, that is, how many opening and / or closing movements were carried out by the door drive.
In the case of the mapping table described above, the controller is coupled to a nonvolatile memory in which the mapping table is stored. The data stored in the mapping table may vary Be predetermined factory or by means of a suitable input device locally entered or adapted. This is for example advantageous if other temperatures prevail at the site than at the manufacturer. The controller is coupled on the input side and / or output side to the electric motor of the door drive. Ie. the motor current can serve as an operating parameter and / or as an output parameter.

The door drive preferably also has a locking device which is set up to fix the door leaf at least in the open position. The controller in turn is coupled on the output side with the locking device. The locking can be done such that an opening of the door panel is still possible. This is for example possible by a locking device having a freewheel unit, which is rotatably arranged on a shaft of the door drive so that it rotates in the closing direction of the door leaf with the shaft and releases its rotation in the door leaf opening direction.

In this case, the controller can be designed as a control module in the form of a functional module, which is designed to add the door drive separately to the extension of the door drive to the function of the overload protection. This makes it possible to retrofit the door drive with an additional overload function.
The control module can be designed as a functional module, for example in the form of a plug-in card, which can be inserted in a standard slot of the control of the door drive. In particular, the control of the door drive can be designed such that it can also be operated without this function module. Only by the function module is an activation of the door drive for execution the method according to the invention. However, for example, individual components such as a temperature sensor can be arranged on the functional module, which consequently is inserted into the door drive only when the functional module is added. For example, door drives may have a mounting situation in which there is only a small load height of the door drive. Accordingly, the execution of the method according to the invention is not necessary. However, if a structurally identical door drive is used in an installation situation that would allow for a very high load height of the door drive, or if the use of the relevant door changes, the door drive can be added to the functional module for carrying out the method according to the invention for overload protection of the door drive.

Further, measures improving the invention will be described in more detail below together with the description of preferred embodiments of the invention with reference to FIGS.

Figur 1

ein Verfahren gemäß einer Ausführungsform der Erfindung,

Figur 2

eine schematische Ansicht der zur Ausübung des erfindungsgemäßen Verfahrens beteiligten Komponenten,

Figur 3

eine schematische Ansicht eines Türantriebs mit einer Steuerung zur Ausführung des erfindungsgemäßen Verfahrens und

Figur 4

ein Verfahren gemäß einer anderen Ausführungsform der Erfindung.

Show it:

FIG. 1

a method according to an embodiment of the invention,

FIG. 2

a schematic view of the components involved in the practice of the method according to the invention,

FIG. 3

a schematic view of a door drive with a controller for carrying out the method according to the invention and

FIG. 4

a method according to another embodiment of the invention.

FIG. 1 shows a method for overload protection of a door drive according to an embodiment of the invention. In a step S1, the relevant door drive is put into operation or started.

In a subsequent step S2, preferably actual values of predetermined operating parameters are recorded periodically or repeatedly, but at least once. The operating parameters preferably comprise at least one temperature in the door drive, a door frequency of the door drive and / or a motor current.

Then, in a subsequent step S3, a load height of the door drive is determined.

On the basis of the ascertained load level, it is determined in a subsequent step S4 whether an adaptation of the further operation of the door drive must take place via the adaptation of the values of predetermined output parameters. If not (no branch after step S4), it jumps to step S2. Otherwise (yes branch after step S4), the continued operation of the door drive is adapted in a subsequent step S5. This is done by outputting values for the output parameters to be adjusted. The following elements can be used as output parameters: Reduction of the acceleration of the mass moment of inertia of the door leaf, switching off the acceleration of the door leaf mass in the direction of travel, changing a fan speed or performance, increasing or (re-) reducing a door hold-open time.

As an example, the method is described by means of a fan control. The control of the fan is made by way of example as a function of the measured (ambient) temperature of the door drive and a Bebefungsfrequenz the door drive or the relevant door.

For this purpose, the door drive, as explained below, a controller. The controller includes or is coupled to a preferably nonvolatile memory. Stored in the memory is a mapping table that contains data sets that include actual values or ranges for operating parameters and associated fan speed or speed adaptation values as output parameters.

Such a mapping table looks like this: operating parameters output parameters foot traffic Temperature (° C) Fan speed (rpm) Minute Max. Minute Max. 0 3 50 0 3 6 50 0 6 50 3000 0 3 50 60 3000 3 6 50 60 3000 6 50 60 4500 0 3 60 4500 3 6 60 4500 6 60 6000

The bold column headings are for better understanding.

As can be seen, the fan control is carried out by way of example based on two operating parameters: the Begehungsfrequenz and the temperature in the door drive. In this case, based on the recorded actual values of the aforementioned two operating parameters in the context of step S3, the load level is determined in the form of the respective relevant data record. A data record is represented by a table line. First of all, the relevant data sets are determined or selected, for example, for the actual value of the attendance frequency. For this purpose, this actual value is checked to see whether it is greater than or equal to the bequest frequency minimum value and at the same time is less than the associated occupancy frequency maximum value of the same record. If the maximum value is missing in the mapping table, no check is made for this maximum value. Ie. at a walk frequency of, for example, 12 walks, the third, sixth and ninth record of the above mapping table are determined. In this case, the value "0" corresponds to a nonexistent, "3" to a low, "6" to a medium and all values greater than 6 to a high occupancy frequency.

At the same time or thereafter, the finally valid data set is determined for the recorded actual value of the temperature. The determination based on the temperature is similar to the determination of the records for the Begehungsfrequenz. As can be seen from the table, some minimum values for the temperature are missing here as well. This has the consequence that then only checks whether the recorded actual value of the temperature is smaller than the respective maximum temperature value when a value is entered in the mapping table. Otherwise, this value is not checked. For example, if the temperature is 52 ° C, the sixth data set is determined, which means that the fan should be set to 4,500 rpm as the adjustment value for the fan speed output parameter.

As part of step S4, it is determined whether an adjustment of the fan speed is required. This is done, for example, by the fact that the determined speed is input to a fan control circuit as the setpoint, which then regulates the speed of the fan and thus executes the steps S4 and S5. Alternatively, the fan is controlled by the controller by means of the determined fan speed.

However, the invention is not limited to the embodiment described above. Temperature sensors are often in the form of thermal electrical resistors, for example ohmic Resistors, realized that have a certain temperature-dependent resistance characteristic. Therefore, a resistance value can also be taken as the actual value for the temperature, resulting in a very simple temperature sensor. Furthermore, the fan does not have to be driven by means of a predetermined speed. Alternatively, resistance values, unique coefficients or percentage values are possible, which are related to the maximum power of the fan. In addition, instead of specifying minimum and maximum values, ie value ranges, only individual values can be stored in the mapping table.
Such an embodiment for a mapping table is shown below: operating parameters output parameters foot traffic Temperature (Ω) Fan power (%) 3 100 0 6 100 0 100 50 3 130 50 6 130 50 130 75 3 75 6 75 100 Due to fan control percentages, this output parameter has been renamed to Fan Power for better understanding.

As you can see, there are also some missing values here. In these cases, checking is only performed if a value is specified in the mapping table. If a value is missing in a record of the mapping table, no check is made and the record is considered relevant. Ie. at the above-mentioned Begehungsfrequenz of 12 inspections turn the third, sixth and ninth record of the providing mapping table are determined. If the temperature is again 52 ° C, which exemplarily corresponds to a resistance value of 110 Ω, the sixth record of the mapping table is determined from the three preselected data records, which means that the fan must be set to 75% as the adaptation value for the output parameter "fan power".

The values given in the tables are only examples and are merely illustrative. Of course, other values are possible.
Instead of or in addition to the at least one existing table, values for operating or output parameters may also be implemented in the form of software, for example in an integrated circuit.

The determined output parameter value is preferably output in the form of a PWM signal.

Alternatively or in addition to the fan control, a dynamics limitation of the door leaf is realized by means of which mass accelerations, in particular of the door leaf, are reduced. Preferably, the reduction of the mass acceleration takes place by means of exposing the motorized door acceleration in the direction of travel through the door drive. Ie. the motor, which accelerates the door leaf in the closing direction to support the purely mechanical closing mechanism, is switched off. As a result, the door leaf is only accelerated by the closing mechanism, by an existing, tensioned closing spring, to the desired speed.

Alternatively or additionally, it is also possible to reduce the mass acceleration in the up direction. This will, as later explained limited to the motor of the door drive accelerating current in the form of an increased motor current.

FIG. 2 shows the components involved in carrying out the method according to the invention of a door drive 1 according to an embodiment of the invention. As a central component, a controller 4 is shown schematically, in which several operating parameters E1, E2, E3 ... En are indicated as input variables by way of example with arrows. The first operating parameter E1 is indicated as an operative connection between a temperature sensor 7 and the controller 4. The temperature sensor 7 measures a temperature Θ in the door drive 1. The temperature Θ in the door drive 1 can be formed both by a high or low outside temperature and by the heat generated in the door drive 1. The temperature value is transmitted from the temperature sensor 7 to the controller 4, whereby the first operating parameter E1 is formed. The second operating parameter E2 may be formed by the passage frequency of the door, which is actuated by the door drive 1. A high attendance frequency means a high load level. The third operating parameter E3 represents a motor current, so that a high motor current results in a high load level. For example, wind loads can act on the door leaf, resulting in an increase in the motor current for performing the opening or closing movement. Furthermore, objects may be in the pivoting range of the door leaf, or the door has a stiffness. The operating parameter En indicates more than the operating parameters described above, so that more than three operating parameters can be queried by the controller 4.

Right side in FIG. 2 Output parameters A1, A2, A3 ... Am indicated by led out of the control 4 arrows. The first and the second output parameters A1 and A2 act on an electric motor 3. The first output parameter A1 represents an adaptation the torque in the closer shaft of the door drive, whereby the adjustment of the torque by a corresponding adjustment of the operation of the electric motor 3 takes place. For example, the speed of the opening movement of the door leaf can be reduced, resulting in a lower torque in the closer shaft of the door drive and as a result a lower motor current of the electric motor 3 result. Even with a reversal of movement of the door leaf, for example when the door leaf during a closing movement must be converted back into an opening movement, an adjustment of the acceleration of the dynamically moving masses can be adjusted as the first output parameter A1 in the form of motor current.

For this purpose, for example, the motor current from 0.1 amps to 10 amps can be divided into 100 increments. If a maximum motor current of, for example, 10 amperes is permitted, no adaptation of the first output parameter A1 is required. However, if an adjustment of the first output parameter A1 is made, then a value <100 increments of the motor current can be provided as a motor current limit, wherein the limitation of the motor current is adjusted such that nevertheless an execution of the opening movement of the door leaf is still possible.

A second output parameter A2 also acts on the electric motor 3, wherein the second output parameter A2 describes the connection or disconnection of a motor support the closing movement of the door leaf by a closing spring. If the second output parameter A2 is adjusted, then, for example, the motor support of the closing spring by the electric motor 3 can be omitted. Furthermore, a delay of the door leaf can be omitted shortly before the closed position.

The third output parameter A3 acts by way of example on a fan 6, which can either be switched on or off in terms of its operation, or the fan 6 is adapted in its speed or speed. Continuous operation of the fan 6 may be undesirable. Furthermore, it can be provided that the fan 6 should be operated neither in the maximum mode nor in the off state. Consequently, the fan 6 can be operated in such a way via the third output parameter A3 that the load height of the door drive does not exceed a maximum value. A full operation of the fan 6 causes a cooling of the door drive and thus a feedback in the temperature, so that thereby the first operating parameter E1, namely the temperature in the door drive, can be reduced again.

The fourth output parameter A4 can be used to adjust the hold-open time of the door leaf. An extension of the open time causes a reduction in the frequency of the door operation, so that the total load height of the door drive can be reduced. This can be done via a control module SM, which preferably also for unlocking, as explained later, is used. Alternatively, the output parameter A4 relates to the energization of a locking or locking device, which ensures that the door leaf is held in the open position. Alternatively, the motor 3 is energized in the up direction of the door panel so that the door leaf is kept open.

Further output parameters are indicated by Am, which can also be influenced by the controller 4.

FIG. 3 shows a schematic view of the door drive 1 with a closer shaft 2, via which a door leaf of a door is pivotable. In order to actuate a door leaf with the closer shaft 2, a torque M is transmitted via the closer shaft 2, which leads to a pivoting of the door leaf. The closer shaft 2 protrudes from a Transmission 8 out, wherein the electric motor 3 is arranged on the transmission 8 or operatively connected to this, to actuate the closer shaft 2 via the transmission 8 rotatably. Furthermore, a closing spring 5 is indicated, which is also arranged on the transmission 8. If a rotation of the closer shaft 2 is generated by the electric motor 4 to the opening of the door leaf, at the same time the closing spring 5 is tensioned. For carrying out the closing movement of the door leaf, the potential energy stored in the closing spring 5 can be sufficient, wherein the closing movement can likewise be assisted by the electric motor 3.

Further, the door drive 1 is shown with the control module SM, which can be performed in addition to the controller 4 in the manner of a functional module. The door drive 1 can also be operated without the presence of the control module SM, wherein the inventive method is initially not executable and must first be enabled by the control module SM. Ie. the overload protection function is already pre-implemented in the controller 4.

Furthermore, the temperature sensor 7 for determining the temperature in the door drive 1 is shown. This is arranged adjacent to a fan 6, which is exemplified as an axial fan and preferably warm air sucked out of the door drive 1, indicated by a plurality of flow arrows. Consequently, by this arrangement, the temperature sensor 7 detect a temperature in the door drive 1, and transmit as the first operating parameter E1 to the controller 4. Alternatively, however, the temperature sensor 7 may also be present on the control module SM, so that the temperature sensor 7 is added to the door drive 1 only by adding the control module SM. But it can just as well be arranged on the control.

The use of only one temperature sensor 7 is advantageously possible in particular when the air flow generated by the fan 6 is conducted past all components of the door drive 1 to be cooled and thus reaches each of these components.

The control module SM can be plugged into a standard slot on the controller 4, wherein the slot can also be occupied by functional modules that allow a function other than the exercise of the present method by the control module SM.
In this case, the SM control module is required for short-term activation of the overload function, but not for the current operation with overload function.

In summary, in order to avoid an overloading of the door drive, the following protective measures can be provided by the above-described method: burden defense monitored operating parameters Mass acceleration when opening Motor current limiting temperature Reduce acceleration ramp Mass acceleration when closing Acceleration exclusively via closer spring temperature Motor load when closing Switch to normally open mode temperature too frequent reversing Extension of the hold-open time commission number Fan failure Switch to normally open mode temperature

According to this table, in the context of the overload protection, specific, too high actual values of specific operating parameters can be reacted with suitable protective measures to relieve the door drive of certain loads and thus to prevent damage. In the context of the determined temperature, as described above, the mass acceleration when opening the door leaf can be reduced by reducing the current applied to the motor, at least in the region of the acceleration, ie the acceleration current. This will cause the resulting ramp, i. H. the increase in the acceleration current, reduced. When closing, when the engine is supporting, it is energized less or even switched off, so that it can cool. If the fan fails so that it can no longer cool, the motor of the door drive is preferably completely switched off to prevent damage to the door drive.

The number of so-called reversing operations, when the door leaf is thus reversed in its direction of movement, can lead to a load, provided that the motor acts to assist in reversing. A suitable protective measure is to increase the hold-open time during which the engine has time to cool.

FIG. 4 shows a method according to another embodiment of the invention, depending on the temperature Θ. This process gradually shuts down processes with increasing temperature Θ, increasing in importance for operation. First, in a step S6, the engine is shut down only in the case of mass acceleration when closing the door panel, so that the functionality of the door drive is at least impaired. If the temperature Θ remains too high, or even continues to rise, the motor is completely shut off in a step S7 when closing, so that it can cool when closing. If the temperature Θ continues to be too high, the mass acceleration during opening is also reduced in a step S8, in that here too the acceleration current for the motor is reduced. If this still is not enough to reduce the temperature Θ, the motor is completely switched off in a step S9. This procedure is especially necessary if the fan fails or is already running at full load.

LIST OF REFERENCE NUMBERS

1

door drive

2

closer shaft

3

electric motor

4

control

5

closer spring

6

Fan

7

temperature sensor

8th

transmission

SM

control module

M

Torque on closer shaft

E1 ... En

operating parameters

A1 ... Am

output parameters

S1 ... S9

steps

Θ

temperature

Claims (15)

1. A method for protecting a door drive (1) against overload, including the steps of:

   • acquiring the actual values of several operating parameters (E1, E2, E3, En) of the door drive (1) for determining a load range, wherein the load detectable therefrom constitutes a load level, wherein the

   • determining the load level of the door drive (1) is realized by means of comparing the acquired actual values with at least one associated comparison value of the respective operating parameter (E1, E2, E3, En), and by means of summing up the loads resulting from the operating parameters,

   • dynamically adapting the continued operation of the door drive (1) depending on the load level in such a manner that a thermal overload of the door drive (1) is avoided,

   • wherein the step of adapting the continued operation of the door drive (1) is performed by means of adapting at least one output parameter (A1, A2, A3, A4, Am) of the door drive (1) already prior to reaching the maximum load level.
2. The method according to claim 1, characterized by a step of measuring a temperature in the door drive (1), wherein the temperature constitutes a first operating parameter (E1).
3. The method according to claim 2, characterized by a step of acquiring a passage traffic frequency of the door actuated by the door drive (1), wherein the passage traffic frequency constitutes a second operating parameter (E2).
4. The method according to claim 3, characterized by the additional steps of:

   • operating an electrical motor (3) of the door drive (1) with a motor current, and

   • acquiring the motor current, wherein the motor current constitutes a third operating parameter (E3).
5. The method according to any of the claims 1 to 4, characterized in that the step of adapting the at least one output parameter comprises the steps of:

   • determining one respective adaptation parameter for the at least one output parameter (A1, A2, A3, A4, Am) based on the determined load level, and

   • outputting the determined respective adaptation value for the at least one output parameter (A1, A2, A3, A4, Am).
6. The method according to claim 5, characterized in that the step of determining the respective adaptation value is realized by means of reading a mapping table based on the taken actual values, wherein in the mapping table for predetermined actual values for operating parameters (E1, E2, E3, En) or for actual value ranges of operating parameters (E1, E2, E3, En) are stored, as associated comparison values, respective adaptation values for output parameters (A1, A2, A3, A4, Am) of the door drive (1).
7. The method according to any of the claims 1 or 5 to 6, characterized by a step of actuating a door leaf of the door with a torque (M) in a closer shaft (2) of the door drive (1), wherein the torque (M) constitutes a first output parameter (A1).
8. The method according to any of the claims 4 and 7, characterized by a step of executing the closing movement of the door leaf of the door by means of a closer spring (5) of the door drive (1), wherein

   • the closing movement is assisted by the electric motor (3), and

   • the switching on or off and/or the intensity of the motor assistance of the closing movement constitutes a second output parameter (A2).
9. The method according to claim 8, characterized by a step of cooling components of the door drive (1) by means of a ventilator (6), wherein a rotational speed of the ventilator (6) constitutes a third output parameter (A3).
10. The method according to claim 9, characterized by the additional steps of:

    • executing an opening movement of the door leaf, and

    • thereupon controlling a hold-open time of the door leaf, wherein the hold-open time of the door leaf constitutes a fourth output parameter (A4).
11. The method according to any of the previously mentioned claims, characterized in that the step of adapting the output parameters (A1, A2, A3, A4, Am) is realized one depending on the other.
12. A door drive (1) for a door having a control (4), adapted to perform a method for protecting a door drive (1) against overload, including the steps of:

    • acquiring the actual values of several operating parameters (E1, E2, E3, En) of the door drive (1) for determining a load range, wherein the load detectable therefrom constitutes a load level, wherein the

    • determining the load level of the door drive (1) is realized by means of comparing the acquired actual values with at least one associated comparison value of the respective operating parameter (E1, E2, E3, En) and by means of summing up the loads resulting from the operating parameters,

    • dynamically adapting the continued operation of the door drive (1) depending on the load level in such a manner that a thermal overload of the door drive (1) is avoided,

    • wherein the step of adapting the continued operation of the door drive (1) by means of an adaption of at least one output parameter (A1, A2, A3, A4, Am) of the door drive (1) is realized already prior to reaching the maximum load level, wherein the door drive (1) includes a temperature sensor (7), which is coupled on the output side to a data input of the control (4) and disposed within the door drive (1), and the control (4) includes a time monitoring circuitry for monitoring at least one time interval and logic for determining a number of traffic passages within the time interval, wherein the control (4) on the input side and/or on the output side is coupled to an electric motor (3) of the door drive (1).
13. The door drive (1) according to claim 12, characterized in that the step of determining the respective adaptation value is realized by means of reading a mapping table based on the acquired actual values, wherein, in the mapping table, for predetermined actual values for operating parameters (E1, E2, E3, En) or actual value ranges of operating parameters (E1, E2, E3, En) are stored, as associated comparison values, respective adaptation values for output parameters (A1, A2, A3, A4, Am) of the door drive (1),
    wherein the control (4) is coupled to a non-volatile memory, in which the mapping table is stored.
14. The door drive (1) according to any of the claims 12 to 13, characterized in that

    • the door drive (1) includes an arresting device, which is adapted to arrest the door leaf at least in the opening position, and

    • the control (4) on the output side is coupled to the arresting device.
15. The door drive (1) according to any of the claims 12 to 14, characterized by a control module (SM), which is configured as a functional module, which is adapted for extending the door drive (1) by the function of the overload protection to be separately addable to the door drive (1).

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