JP3250165B2 - Drive control device for electric shutter for construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for an electric architectural shutter for opening and closing an opening.

[0002]

2. Description of the Related Art In general,
This type of architectural electric shutter adopts an inverter control system in which the shutter curtain provided in the opening is vertically opened and closed by driving a switch that is speed-controlled based on the output from the frequency conversion circuit. There is. By the way, in this thing, the shutter car
Increase or any abnormal load is temporarily generated during operation of ten, when the power supply voltage, such as temporarily decreased, shut
The rising load of the tar curtain may exceed the drive torque of the switchgear. However, in the ascending drive state, since the brake device is released, the descending stop by the brake device is not performed as in the stopped state, and the shutter is released.
-There is a problem that the curtain falls under its own weight while the electric motor that is going to be driven upward is rotated in reverse.

[0003] In order to avoid such reverse rotation of the electric motor, it is necessary to use a frequency conversion circuit device having a larger capacity than necessary so as to prevent the electric motor from rotating in the reverse direction. Depending on the setting of the abnormal situation, there is no limit, and there is a problem that it is not allowed to significantly contradict the reduction in weight and size, and the cost must be expensive.

[0004]

The present invention SUMMARY OF THE INVENTION The electrodeposition architectural capable to wipe these drawbacks in view of the such circumstances the
Be one that is created for the purpose of providing a drive controller in dynamic shutter, Shah provided in the opening
The shutter curtain , the architectural electric shutter that is configured to perform the elevating opening and closing operation by driving a switch that is speed-controlled based on the output from the frequency conversion circuit,
The frequency conversion circuit is provided with a braking resistor for braking the switch when the shutter curtain is lowered and a current detecting unit for detecting a current flowing through the braking resistor, and the current detecting unit is connected to the switch. The AND switch is connected to a drive control circuit, and the switch is emergency stopped based on detection of an abnormal current flowing through the braking resistor when the shutter curtain is raised .

According to the present invention, with this configuration, it is not necessary to use an unnecessarily large capacity frequency conversion circuit device.
And use the necessary braking resistance during descending operation to raise
This is to detect abnormalities during movement .

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a shutter curtain of a shutter device built at an opening of a building. The shutter curtain 1 is driven by a forward / reverse drive of a switch 2 configured by using an electric motor 2a and a brake device 2b. connexion wound up drum 3 wound to rotate, performs a vertical lifting movement by being unwound, whereby the shutter curtain 1
Has a configuration in which the opening is opened and closed while being guided by the guide rail 4, but all of these configurations are conventional.

[0007] Shutter curtain 1 by the switch 2
Opening / closing drive control will be described based on the control circuit diagram of FIG. Here, R, S, and T are each phase of a three-phase AC power supply, and power is supplied to the switch 2 via the main switch MSW. 2 is provided with a frequency conversion circuit device 5. As the frequency conversion circuit device 5, a generally known general-purpose device such as a VVVF inverter device can be adopted. In short, the frequency conversion of the power supply current is controlled by the open / close drive control circuit device 6. What is necessary is just to perform based on a command. The opening / closing drive control circuit device 6 includes push-button operation switches PBU, PBD, PBS for ascending, descending, and stopping, limit switches LSU, LSD for upper and lower limits, and deceleration position detection switches 7, 8, for up and down. Various switches such as an obstacle detection switch SFT are connected. Then, for example, when a switch signal from the ascending operation switch PBU is input, the opening / closing drive control circuit device 6 outputs an opening command to the brake device 2b, and sends an opening command to the frequency conversion circuit device 5 until a predetermined speed is reached. Perform gradual acceleration increase control,
Thereafter, a control command for converting the frequency of the power supply current so as to increase at a predetermined speed is output, and the driving of the electric motor 2 causes the shutter curtain 1 to move upward. Then, when a detection signal associated with the shutter curtain 1 reaching the position of the ascent / deceleration position detection switch 7 is input, the opening / closing drive control circuit device 6 performs a frequency conversion of the power supply current so as to perform gradual deceleration / increase control. And outputs a control command to stop the power supply in response to the input of the detection signal of the upper limit switch LSU. Thus, the raising control of the shutter curtain 2 is performed. The same applies to the lowering control of the shutter curtain 2.

Further, reference numeral 9 denotes a braking resistor connected to the frequency conversion circuit device 5. The braking resistor 9 causes the electric motor 2 to act as a generator when the opening / closing member is lowered, thereby consuming its output. A current detection means 10 for detecting that a current has flowed is connected to the braking resistor 9. As the current detecting means 10, various means such as a resistance method, a method using a current transformer, a method for measuring magnetic flux, and a method for measuring heat generation can be arbitrarily adopted.
0, the relay switch 1 which is excited when the current of the braking resistor 9 is detected and closes the current detection contact signal 11a.
1 is provided.

On the other hand, the opening / closing drive control circuit device 6 includes:
In addition to the switches, an output signal from the AND circuit 12 is input. The AND circuit 12 opens and closes when in the ascending drive control state based on the switch operation of the ascending operation switch PBU. An ascending drive contact signal 13 that is closed by a control command from the drive control circuit device 6;
The current detection contact signal 11a of the relay switch 11 constituting the current detection means 10 is connected in parallel. By the way, if it is a circuit configuration in which the ascending drive control circuit is self-held by the switch operation of the ascending operation switch PBU,
A relay switch can be provided in the circuit to change to this. Then, when the control command from the AND circuit 12 accompanying the closing of the ascending drive contact signal 13 and the current detection contact signal 11a is input, the opening / closing drive control circuit device 6
Is configured to output a control command for urgently stopping the electric motor 2a.

In the embodiment of the present invention configured as described above, the opening and closing drive of the shutter curtain 1 is performed by pushing the push-button operation switches PBU and PBD for ascending and descending. In this case, In addition, the opening / closing speed of the shutter curtain 1 is controlled to increase / decrease (constant speed) / decelerate based on frequency control by the frequency conversion circuit device 5.

When the driving speed is controlled based on such frequency control, when the ascending operation switch PBU is pressed to drive the shutter curtain 1 upward, the electric motor 2a is driven upward and When the ascending drive contact signal 13 is closed and the shutter curtain 1 is to be rolled up, an obstacle is hitting the shutter curtain 1, the shutter curtain 1 is forcibly pushed down, or the power supply voltage is temporarily lower than the specified voltage. In some cases, the load on the lower side of the weight of the shutter curtain 1 may exceed the motor driving torque. At that time, the shutter curtain 1 will fall by its own weight, and the electric motor 2a rotates in the reverse direction. Then, a current flows as an abnormal current through the braking resistor 9, which is detected by the current detecting means 10, and the current detecting contact signal 11 a is closed accordingly. Then, the AND circuit 12 outputs a signal to the opening / closing drive control circuit device 6 assuming that the rising drive contact signal 13 and the current detection contact signal 11a are closed, and as described above, the electric motor 2a urgently stops driving. At the same time, the brake device 2b enters the braking state.

As described above, according to the embodiment of the present invention, when the shutter curtain 1 is lifted, the load of its own weight descent temporarily becomes larger than the drive torque of the electric motor 2a when the shutter curtain 1 is lifted. When the motor 1 moves down and the electric motor 2a rotates in the reverse direction, this is reliably detected, and the electric motor 2a is urgently stopped, and the brake device 2b stops moving down. As a result, it is possible to reliably avoid the problem that the shutter curtain 1 is inadvertently lowered, and it is not necessary to employ an unnecessarily large frequency conversion circuit device 5 in response to such a temporary overload. . Moreover, the detection of the abnormal descent during the ascent is performed by detecting the current flowing through the braking resistor 9 necessary for lowering the shutter curtain 1, so that the braking resistor 9 required for the descent control is effectively used as it is. As a result, the members can be shared, and the structure can be simplified.

[0013] Note that the present invention is not limited to the examples are evident, as and- connection,
The connection is not limited to the external wiring, but may be an electrical connection (AND circuit connection) in a control circuit such as a micro computer.

[0014]

[Effects] In summary, since the present invention is configured as described above, when the shutter curtain is lifted , some load temporarily acts to shut down the shutter curtain.
When the opening / closing load of the tar curtain exceeds the operating torque of the opening / closing device and the opening / closing device rotates in the reverse direction, the reverse rotation causes a reduction in the driving resistance required for the lowering operation of the shutter curtain. It is detected by the detection of the flowing current, and the emergency drive of the switch is stopped based on this. As a result, the switchgear that has been temporarily overloaded during the raising operation of the shutter curtain can be automatically stopped in an emergency, so that the inadvertent reverse movement of the shutter curtain can be reliably avoided, and safety can be reduced. In addition, it is not necessary to employ a frequency conversion circuit device having a larger capacity than necessary to cope with a temporary overload, so that the cost can be reduced. Moreover, the detection of the driving device is reversely rotated, so it is performed by detecting an abnormal current flowing through the braking resistor needed to deceleration control the opening and closing motor in lowering operation of the shutter curtain, the deceleration of the said lowering operation The braking resistance required for the control is used as it is for the abnormality detecting member at the time of the ascent operation , so that the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a shutter curtain.

FIG. 2 is a control circuit diagram of the electric switchgear.

FIG. 3 is a block diagram of the electric switch.

FIG. 4 is a circuit diagram illustrating an example of a current detection unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter curtain 2 Switch 2a Electric motor 5 Frequency conversion circuit device 6 Opening / closing drive control circuit device 10 Current detecting means 12 AND circuit 13 Switch contact

Claims (1)

(57) [Claims] 1. A shutter curtain provided at an opening,
In the configuration and building electric shutter comprising to perform lift-off operation by the driving of the driving device which is speed controlled on the basis of the output from the frequency converting circuit, to the frequency conversion circuit, the driving device during lowering operation of the shutter curtain A braking resistor for braking, and current detecting means for detecting a current flowing through the braking resistor are provided, and the current detecting means is AND-connected to a drive control circuit of the switch, and a shutter is provided.
A drive control device for an electric shutter for a building, wherein a switch is emergency-stopped based on detection of an abnormal current flowing through a braking resistor when a curtain lift control operation is performed.