ELGi EN 30X-100, Operation, Maintenance And Parts Manual, Page: 76 / 108

7.18 Controller Manual
Troubleshooting 7.9
S.
NO
Failure symptoms Possible causes Remedies
1
No display in LCD
Screen & Backlight was
not glown
No input supply Check incoming supply to compressor
Transformer failure
Please check the controller input voltage at connector
X01. Voltage should be 24V ± 15% VAC.
Controller failure. Change the controller.
2
Keypad in Controller not
responding
Key not responding Check any key stuck / Flat. If any change Controller
Key struck / Flat Change the controller.
3 "Low voltage" message
in display.
Controller Input voltage less than
18VAC
Until will start functioninig, once input voltage recovered
to nominal or with in specification ( 415 V +10% - 15
%)
4
"Pr. probe failure"
message in display
Loose connection in connector
position (X02 - 7 & 8).
Check the loose connection at both end - Controller and
pressure sensor side.
Pressure sensor failure. Change the Pressure sensor.
Controller failure
Check the voltage across (X02 - 8) with Gnd, voltage
should be b/w 0.4 to 2VDC. If it is different change the
controller.
5
"Tr. probe failure"
message in display
Loose connection in connector
position X02 - 9 & 10.
Check the loose connection at both end - Controller and
Temp sensor side.
Temperature sensor failure. Change the Temperature sensor.
Controller failure
Check the voltage across X02 - 9 with Gnd, voltage
should be 3.3 VDC. If it is different change the
controller.
6
"Emergency stop"
"MMOL"
"Cooler OL"
message in display
Loose connection in connector
position (X02 - 1, 2 ,3 & 4).
Check the loose connection at controller end.
Switch got struck
Check either the external switches got sturck / Fault not
cleared
Controller Failure Change the controller.
7 Motor not driving Controller failure
Disconnect the X03 & X04 connector,
Check the relay working by switching on the start key
(X03 -1) with (X03- 2, 3 & 4) & (X04 -1) with (X04- 2).
Note: Ckeck in the continuity mode.
8
"Phase loss/ Reverse"
message in display
Loose connection in connector
position (X05 - 1, 2 & 3).
Check the loose connection at controller end.
Controller failure
Check for the X05 connection X05(1- R, 2-Y, 3 -B), Still
the same error change the controller