Troubleshooting ______________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
8-5
8.4
PLC Troubleshooting
8.4.1 Common PLC Troubleshooting Issues
Table 8-3 PLC Common PLC Troubleshooting Issues
Problem
Possible Cause
Solution
TX Fail alarm active
Front and rear PLC modules
not in same slot.
Confirm modules in same slot
Filter strapping wrong
Confirm filter jumpers correct
Perform TX commissioning procedure
Amp gain set too low
Adjust TX fail R19 on power amp
TX fail threshold improperly set
Adjust TX fail R19 on power amp
Failed PLC rear module
Replace PLC rear module
Failed PLC front module
Replace PLC front module
Low TX signals at
PA out test points
Front and rear PLC modules
not in same slot.
Confirm modules in same slot
Amp gain set too low
Perform TX commissioning procedure
Failed PLC rear module
Replace PLC rear module
Failed PLC front module
Replace PLC front module
Low TX signal level
at TX BNC
connector
Front and rear PLC modules
not in same slot.
Confirm modules in same slot
Filter strapping wrong
Confirm filter jumpers correct
Perform TX commissioning procedure
Amp gain set too low
Perform TX commissioning procedure
Failed PLC rear module
Replace PLC rear module
Failed PLC front module
Replace PLC front module
RX alarm active
No input signal
Confirm signal present at RX test points
RX level calibration not done
Perform RX level calibration procedure
Failed PLC rear module
Replace PLC rear module
Failed PLC front module
Replace PLC front module
RPM alarm active
Line tuner not tuned
Tune line tuner
Failed PLC rear module
Replace PLC rear module