DE8703026U1 - Plug-in device for displaying and monitoring measured values - Google Patents

Description

» t t i i ti i

dsm/11/de-b.d dsm-ll^de

February 9, 1987 DESCRIPTION Sr/Ba

INSTALLER DEVICE FOR DISPLAYING AND MONITORING MEASURED VALUES

State of the art» Task, solution

The invention relates to a plug-in device for a 19-inch rack

group system according to the sub-assembly standard DIN 41 494, parts 4 and 5 [J

(also Euronorm). The device is therefore designed to be inserted into a building gypsum j|

penträger, i.e. a frame that is dimensioned according to this standard.

ned. *

The device has a wide range of possible applications in lifting, control and regulation technology.

During screwing operations, e.g. screwing screws into engine blocks |

with the help of automatic screwdrivers it can reduce the power consumption of the ]

screw motor. The current supplied to the screw motor is proportional to the power delivered by this motor to a screw spindle and

of the torque transmitted to the screw head. The device can t<

display the maximum current consumed. This is the current that is

f reaching the cut-off torque. '

In general, the speed of a motor can be regulated to a range between a minimum and a maximum permissible speed.

If the temperature of a room is to be kept within a certain range, the device can be used to evaluate a temperature measurement and switch on either heating or cooling.

The level of a liquid in a container can be regulated to a range between a minimum and a maximum height. If a pressure cell covered by the liquid is used,

The minimum fill level corresponds to a minimum pressure and the maximum fill level corresponds to a maximum pressure. If the pressure falls below the minimum, the device can open or further open an inflow; if the maximum pressure is exceeded, the inflow can be shut off or throttled or an outflow can be opened.

With emergency power generators, it must be ensured that a battery is always charged. The device can ensure recharging when the voltage falls below a minimum level, and on the other hand, the _charging process can be interrupted when the maximum voltage is exceeded, thus preventing excessive charging.

The invention according to claim 1 creates a plug-in device that complies with the aforementioned 19-inch Euro standard and makes it possible to display the measured values in question, to compare measured values with predetermined values, which is done by a comparator, and finally, in accordance with the output values of the comparator, to make displays by means of light-emitting diodes, which show whether a value is in the specified range or is too high or too low.

A 2-fold limit comparator (hereinafter simply referred to as "comparator") is used to set and determine two limit C values, namely a minimum value that must not be exceeded and a

Maximum value that should not be exceeded.

In a further development according to claim 2, the device can also be equipped for storing the measured maximum and minimum values.

According to claim 3, switches can be connected in the comparator either directly or via the memory provided according to claim 2, which make it possible to send signals corresponding to the minimum and maximum values to lines leading to the outside.

According to claims 4 or 5, the switches can be designed in such a way that they are isolated and thus potential-free, i.e. the output

&bull; · ti·· ·■

dsm-ll^de

Do not distort signals.

According to claim 6, the plug-in device can be provided with a scaling device which ensures that incoming measured values are converted into display values.

According to claim 7, a series of memories can be provided, namely for any measurement values, and also for a peak value of a measurement. Further memories can be used to suppress a display and finally to store a command which serves to delete the contents of other of these memories, in particular to prevent the display of a peak value or to cancel a blocking command which prevents a display.

According to claim 8, the plug-in device can be equipped with its own power supply unit.

According to claim 9, exchangeable modules in the form of plug-in boards can be used to adapt the plug-in device to different measuring signals corresponding to different sensors.

4444 ·

- 4 - dsm-ll=en

Embodiments with further features of the invention are described below with reference to the drawings

,Figure 1 is an external view of the front panel of the rack-mounted device.

Figure 2 also shows the main components of the front panel of the device in an external view.

Figure 3 shows a side view, highly schematic, of individual parts / \ of the plug-in device.

Figure 4 is a block diagram showing simplified and schematic circuit parts of the device.

Figures 1 to 3 show a front panel 1 with a display field 2, which makes it possible to display three digits each in a 7-segment display, as well as a decimal point 3 at one of three selectable positions. Three LEDs are arranged below the display field, namely an LED 4, which indicates that a minimum value has been undershot, an LED 5, which indicates that a maximum value has been exceeded, and an LED 6, which indicates that the measured value ("good value") is within the specified range.
( '

8" and 9" are adjusting screws for trimmers 8 and 9, which are used to set a minimum or maximum value on the comparator. Two buttons 11 and 12 are used to query and display the minimum or maximum value from the comparator.

Two LEDs 14 and 15 are used to display a stored measurement value or a stored peak measurement value. A trimmer 17 can be adjusted using an adjusting screw 17*, which is provided on an additional measurement signal input and can be used to adjust the extent of the amplification of the incoming measurement signal. An adjusting screw 18" for a further trimmer 18 is used to adjust the zero point of a peak value memory (52 in Figure 4).

- 5 - dsm-11-·

20 is a button for deleting a displayed peak value.

The front panel 1 has a handle 22. Behind the front panel there is a display board 24 on which a display unit 44, the LEDs 4 to 6, the trimmers 8, 9 and the buttons 11, 12 are attached. A base board 25 (printed circuit board) is connected to the front panel 1 and carries further components and circuit parts, such as a DIL switch for selecting one of the three decimal points ^, three trimmers 28, 29, 30 for setting the zero point of the displayed measured values, as well as the maximum offset value or the minimum offset value.

Sj offset value of the comparator. Furthermore, one of several interchangeable \ MeQ range boards 32. This allows the device to be adapted to various sensors for different physical quantities.

Two reed relays 34, 35 are provided for querying the minimum and maximum values of the comparator. A connector 37 with a number of plug contacts (not shown) is used to connect the plug - in device within a frame that accommodates the device. Two power relays 39, 40 are used to output the minimum and maximum values of the comparator.

Figure 4 shows components, circuit parts and other components of the plug-in device as well as a schematic of the wiring. A power supply unit 42 is used to supply the plug-in device with direct current.

The display field 2 according to Figure 1 accommodates either a display unit 44 for a three-digit display or a display unit 45 for a three-and-a-half-digit display, i.e. a display in which only a 1 can be shown as the first digit. Instead, a four-and-a-half-digit display unit 46 can be provided.

A memory unit 48 contains four different memories, namely for any measurement values, for a peak value, for a blocking command for suppressing, i.e. not displaying, incoming measurement signals, and finally for a command to delete the peak value and/or

>» ■ II·· · ft

&bull; · ti · · · I

■ I »II ft · · ■ ·

&bull;&igr; ii· · ■ ·

&bull; ·* &igr;&igr; ii »*■■ · · «

- 6 - dsm-ll^de

of the blocking command. A measuring range module 50 in the form of an exchangeable circuit board is used to adapt the device to different sensors for different physical measurement values. A peak value memory 52 is also provided, the zero point of which can be adjusted using the trimmer 18.

On the 2-way limit comparator (comparator 54), a minimum value can be set using trimmer 8 and a maximum value using trimmer 9. Two trimmers 29 and 30 are used to set a maximum / offset value or minimum value on the comparator. Two buttons 11

and 12 are used to query the minimum and maximum values set by trimmers 8 and 9.

A dual memory (memory 56) is used to store the minimum and maximum values determined by the comparator.

A display component 58 contains the LEDs 4, 5 and 6, which indicate that either the minimum value has been undershot or the maximum value has been exceeded or the measured value is in the desired "good" range. A switch group 60 contains four relays, each with a relay switch for outputting the temporarily stored minimum and maximum values of the comparator. The relay switches can usually be loaded with 220 V, or 42 V DC or AC if required.

Furthermore, a correction element 62 can be provided for zero point correction.

Il It I I it Il Il

&igr;&igr; · &igr; 11·

It· III

till Il

I Il ItII I '

dsm/lJ./de-bz.d dsm-ll^de

REFERENCE SIGNS

1 front panel

2 Display field

3 decimal point

4, 5, 6 LEDs for minimum, maximum and

Good value

8, 9 Trimmer for minimum and maximum value

11, 12 Buttons for minimum and maximum value / 14 LED for measured value memory

15 LED for peak value memory

17 Trimmer for additional input of the amplifier

18 Peak zero point trimmer

20 Button for clearing the peak value display 22 Handle

24 Display board

25 Base board

26 DIL switches for the decimal point

28 Trimmer for display zero point

29 Trimmer for the offset value of the maximum comparator

30 Trimmer for the offset value of the minimum ( ' comparator

32 Measuring range board

34, 35 Reed relay for minimum or maximum value

37 connectors

39, 40 Power relay for minimum or maximum value

42 Power supply

44, 45, 46 display units

48 Storage unit

49 optocouplers

50 Measuring range module

52 peak value memory

54 2-way limit comparator

* &igr; ■ &igr; · ·

»> I Bl ·

»ti 1 ■ ■

- 2 - dsm-11-en

56 Storage 58 Display component 60 Switch group 62 Correction element

Claims (9)

dsm/11/de-a.d dsm-ll^de February 9, 1987 S/Ba PROTECTION CLAIMS 1. Plug-in device for displaying and monitoring measured values, characterized by the following components: a) a rectangular front panel (1), the width and height of which are whole multiples of sub-units (TE) or height units (HE) of the assembly system according to the 19-inch Euronorm (DIN 41 494), / > b) at least one electrical measuring device, c) at least one digital display of measured values for at least two, in particular three digits with preferably seven segments per digit, d) at least one double limit comparator (54) for determining whether a maximum measured value is exceeded or a minimum measured value is undershot, e) LEDs (4, 5, o) for displaying the output values of the comparator (54). 2. Plug-in device according to claim 1, which additionally serves to store measurement values, characterized by a memory (56) connected downstream of the comparator for storing the measured minimum ' ' and maximum values. 3. Plug-in device according to claim 1 or 2, characterized by an isolated switch (in 60) which is connected downstream of the minimum and the maximum output of the comparator (54) and is in turn connected to a signal output. 4. Plug-in device according to claim 3, characterized in that the j switches are relay contacts. 5« Plug-in device according to claim 3 _S , characterized in that the j switches are optocouplers» Il Il I I I ( Il Il < · Il I Il I » Il I Il I tll. &bull; I III II« I t I t III &Lgr; &igr; Il Il In Il ¹ · « 1 I dsm-ll^de 6. Plug-in device according to claim 1, characterized by a scaling device (in 50) which multiplies measured values by a selectable factor and whose output is connected to the digital display of the measured value for a signal corresponding to the multiplication. 7. Plug-in device according to claim 1, which additionally serves to store measurement values, characterized by an isolated control input (logic input) (in 48), in particular in the form of an opto- {�Lgr; coupler (49), for at least one circuit part with: a) a memory for measured values, b) a memory for a peak value of a measurement, c) a memory for a command to delete the memory according to b) and/or a memory according to d) for a blocking command, d) a memory for a command to block, namely prevent the display of incoming measured values. 8. Plug-in device according to one of the preceding claims, characterized by a power supply unit with an alternating current input and a direct current output. 9. Plug-in device according to one of the preceding claims, characterized by modules in the form of plug-in boards with circuit parts for converting electrical input signals from sensors for physical quantities into electrical output signals. I III! Il ·· ·· I (I Il # · t III · '·· I III I I < II Il t · < · I «&Igr;&Igr;· · ■■ ' · '