What to do if Dräger Controller display screen shows: NO INPUTS?
If the display screen of your Dräger Controller shows 'NO INPUTS', the problem is probably a ribbon cable fault. Repair or replace the ribbon cable.
What to do if I am unable to transfer configuration to or from the Dräger Controller?
If you're unable to transfer the configuration to or from the Dräger Controller, this could be due to a lack of power supply to the controller or a fault with the interface unit (RS-232). You should check and repair the external supply and wiring. If the issue persists, check and repair or replace the interface unit.
Why is the Fault (F) LED illuminated for a single channel on my Dräger Controller?
If the Fault (F) LED is illuminated for a single channel on your Dräger Controller, it could be due to a transmitter wiring fault, incorrect loop current, a faulty transmitter, or a faulty input module. To resolve this: * Check and repair the transmitter wiring. * Recalibrate the loop current if it's incorrect. * Replace the transmitter if it's faulty. * Replace the input module if necessary.
What to do if Dräger Controller display screen shows: Under-range?
If the display screen of your Dräger Controller shows 'Under-range', it could be due to a faulty transmitter connection, incorrect loop current, or a faulty transmitter. You should check and repair the transmitter wiring. If the wiring is correct, recalibrate the loop current. If the problem persists, replace the transmitter.
What to do if Dräger Controller display screen shows: Over-range?
If the display screen on your Dräger Controller displays 'Over-range', the issue likely stems from a short-circuit in the remote sensor transmitter wiring or a fault with the remote sensor transmitter itself. To fix this, you should check and repair the transmitter wiring. If the wiring is not the issue, check and repair the transmitter.
Why is the gas level on my Dräger Controller different from the remote sensor transmitter?
If the controller gas level differs from the level displayed at the remote sensor transmitter for your Dräger Controller, it could be due to a transmitter calibration fault, an input channel calibration fault, or an incorrectly set input channel range. Try to recalibrate or set the input channel range the same as the transmitter range.
Why is the output constant but the gas-level on the display screen changing on my Dräger Controller?
If the output is constant but the gas-level on the display screen is changing on your Dräger Controller, the alarms may be inhibited. Return the inhibit switch to position 0.
Why is there no signal from all outputs and the green LED is not illuminated on my Dräger Controller?
If there is no signal from all outputs and the green LED is not illuminated on your Dräger Controller, it could be due to no supply to the module or a faulty output module. Check and connect or repair the ribbon cable to the module. If the issue persists, replace the output module.
Why is the output constant at 1 ± 0.3 mA on my Dräger Controller?
If the output is constant at 1 ± 0.3 mA on your Dräger Controller, it could be due to no signal from the input modules or a faulty output module. Check and connect or repair the ribbon cable. If the issue persists, replace the output module.
Why is the Power DC / LED not illuminated but the display screen is on on my Dräger Controller?
If the Power DC / LED is not illuminated, but the display screen is on for your Dräger Controller, the issue might be a controller supply fault or a faulty display board. Check and repair the external or internal 24 Vdc supply. If the LED still doesn't illuminate, replace the display board.
General| Input Voltage | 24 V DC |
|---|---|
| Communication Interfaces | Modbus RTU |
| Input signal | 4 to 20 mA |
| Relays | 3 programmable relays (SPDT, 5 A / 250 V AC) |
| Power supply | 24 V DC |
| Operating temperature | -20 to +55 °C |
| Type | Controller |
| Outputs | 4 to 20 mA |
Explains the meaning of different warning signs used in the document.
Details text formatting and symbols used for navigation and information.
Lists registered trademarks and their owners.
Describes the REGARD® 3900 series control units for gas monitoring.
Outlines the primary applications for the REGARD® 3900 control units.
Specifies conditions and areas where the control unit should not be used.
Details the certifications and directives the control unit complies with.
Provides an overview of the control unit's structure and internal LEDs.
Describes the display screen, LEDs, inhibit switch, and contrast settings.
Explains the function, channels, and relays of the input module.
Details the function and configurable relays of the relay module.
Describes the output module's function for sending signals to external devices.
Outlines safety precautions and general steps for installation.
Provides instructions on positioning and mounting the control unit.
Covers cable entry procedures and grounding plate usage.
Introduces the AC and DC power supply options for the control unit.
Explains AC power input requirements and recommendations.
Details the DC power input and its requirements.
Describes the configuration for using both AC and DC power sources.
Guides on installing, combining, and numbering control modules.
Details the connection of control modules and the display PCB.
Explains wiring for 4-20 mA two-wire and three-wire transmitters.
Describes how to connect an external switch for acknowledgement.
Details the use of relay terminals for external alarm and safety equipment.
Explains how output signals are sent to external monitoring devices.
Explains how to read and navigate the control unit's display screen.
Describes the function of alarm, fault, activity, power, and inhibit LEDs.
Details the internal acoustic alarm and external warning device activation.
Explains the operation of buttons like Acknowledge/OK and Hold.
Describes the procedure for testing unit LEDs, display, and alarm.
Provides a table of common faults, causes, and remedies.
Addresses faults related to Polytron remote sensor transmitters.
Covers setting up and calibrating the control unit and its modules.
Details navigation and options within the REGARD 3920 calibration system.
Explains how to define module combinations and settings for gas detection.
Explains how to configure relay module settings for alarms and warnings.
To Next Page
