Troubleshooting Table
The troubleshooting table gives information about common faults that occur during commissioning and operation. These common faults can be repaired by a competent operator.
Before you do the following corrective actions, inhibit or disconnect the external alarm wiring to prevent an accidental Alarm High condition.
|
Problem |
Possible Cause |
Corrective Action |
|
No output signal and all LEDs are off |
No dc power to the device |
Make sure that 24 Vdc is applied with the correct polarity. |
|
2 mA signal, green LED is off, yellow LED is blinking |
Device is in COPM Fault |
Clean the optical window and reflectors. Refer to Cleaning the Optical Window and Reflectors for instructions. |
|
0 mA, 1.25 mA, or 3.5 mA signal, and yellow LED is on |
Low supply voltage or other fault |
Make sure that the supply voltage is ≥20 Vdc at the device. If it is, cycle the power to see if the fault is removed. |
|
Constant 8 mA signal with no known radiation to device |
Background IR radiation at device |
Put a cover over the optical window for 10 seconds. If the device senses background IR, and the analog output still shows 8 mA, contact technical support for more troubleshooting. |
|
Constant 12 mA signal with no known radiation to device |
Background UV radiation at device |
Put a cover over the UV part of the optical window for 10 seconds. If the device senses background UV, and the analog output still shows 12 mA, contact technical support for more troubleshooting. |
|
Constant 16 mA or 20 mA signal (Alarm Low or Alarm High) with no known radiation at device |
Background UV radiation at device |
Put a cover over the optical window for 10 seconds. If the analog output still shows 16 mA or 20 mA, contact technical support for more troubleshooting. |
If the corrective actions recommended in the troubleshooting table do not correct operation of the device, return the device to General Monitors for repair.