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7. TROUBLESHOOTING
The RED LED in the LED card indicates the FAULT. To
identify the fault, check the status
displayed on the LCD/relay status. Following are the typical displays of
the FAULT
condition and the trouble shooting methods to resolve those issues.
I.
DISPLAY-“24V supply fail”
TROUBLESHOOTING:
a.
Check whether FRC cable is properly connected between CPU card and Power
Supply card.
b.
Measure the DC voltage between ‘+’ and ‘-’ terminals in Customer Terminal
Compartment using a multimeter. Here we are supposed to get 24VDC. If no voltage
is coming, then measure the resistance between those terminals using a multimeter
by disconnecting the MAINS. If there is a dead short, then replace Power Supply
Card.
II.
DISPLAY- “Single Phase”
TROUBLESHOOTING:
a.
Ensure that the MAINS 3 phase input supply voltage and frequency of operation is
matching the ratings mentioned on the name plate.
b.
This module indicates Single Phase fault when only Y-phase is missing.
c.
Check if there is any discontinuity between the power terminal and transformer card
J1 – Y Terminal.
d.
Check for any loose contact/discontinuity in the 8-pin Mini-Fit MOLEX connectors
between the fuse and the transformer.
e.
Check whether FRC cable is properly connected between CPU card and Power Supply
card.
III.
DISPLAY- “TH Switch Trip”
TROUBLESHOOTING:
a.
Check the motor Thermo switch continuity; if continuity is not there then we have to
replace the motor.
b.
If the motor thermo switch continuity is there then, check the continuity between
wires with ferrule TH and F1 of the J6 on CPU card; If there is no continuity then
check the wiring error.
c.
After the above two corrections, if the same error message display continues, then
replace the CPU card.
