What Does the Red Fault + or - LED Indicator Light on a PSPM Mean?
I am seeing a red light on Fault +/- on my Paradigm Station Power Module. What error does this indicate?
The fault indicators illuminate when an imbalance in LinkPower has been detected. Most commonly, this means the station wiring has a fault. A connected device on the LONbus can also cause a fault indicator light if it is experiencing issues.
- If the NET A line has a fault (is shorted or has leakage to ground), the Fault + LED lights. The NET A line is the line connected to the header marked A on the LON input.
- If the NET B line has a fault (is shorted or has leakage to ground), the Fault - LED lights. The NET B line is the line connected to the header marked B on the LON input.
- If neither fault LED is illuminated the data connections are properly installed and the stations are receiving the data and power required for operation
The fault indicator lights will automatically turn off when the condition is cleared. No power cycle necessary.
Finding the Fault
It can be difficult to find a fault once you have determined that one is preset. There are a few things you can try:
- Disconnect station wiring runs until the fault clears in order to determine which home run has the fault. Once this has determined, check the line in question for nicks or shorts. Make sure A and B are not crossed at any WAGO connection points.
- Remove stations one at a time to see if the fault clears. If so, you may have a failed station.