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SMM
Communications
Failure
Check that PSIO communication plugs are connected correctly. Check SMM communi-
cation plug. Check for proper SMM power supply. See Control Modules section.
High Oil
Temperature While
Running
Check for proper oil level (too much oil). On hermetic EX compressors, check that TXV
valve is operating properly. On hermetic or open-drive FA compressors, check water
supply to oil cooler.
Blank LID Screen
(Minimal Contrast
Visible)
Incrase contrast potentiometer. See Figure 50. Check red LED on LID for proper opera-
tion, (power supply). If LED is blinking, but green LED’s are not, replace LID module,
(memory failure). Check light bulb if backlit model.
‘‘Communications
Failure’’ Highlighted
Message At Bottom
of LID Screen
LID is not properly addressed to the PSIO. Make sure that “Attach to Network Device,”
“Local Device” is set to read the PSIO address. Check LED’s on PSIO. Is red LED oper-
ating properly? Are green LED’s blinking? See control module troubleshooting section.
Control Test Disabled
Press the “Stop” pushbutton. The PIC must be in the OFF mode for the Control Test to
operate. Clear all alarms. Check line voltage percent on Status01 screen. The percent
must be within 90% to 110%. Check voltage input to SMM, calibrate starter voltage
potentiometer for accuracy.
Vanes Will Not Open
in Control Test
Low pressure alarm is active. Put machine into pumpdown mode or equalize pressure.
Check guide vane actuator wiring.
Oil Pump Does Not
Run
Check oil pump voltage supply. Cooler vessel pressure under vacuum. Pressurize ves-
sel. Check temperature overload cutout switch.
LID Default Screen
Does Not Update
This is normal operation when an alarm is present. The screen freezes the moment the
alarm is activated to aid in troubleshooting. The Status01 screen provides current infor-
mation.
Machine Does Not
Stop When the STOP
Button is Pressed
The STOP button wiring connector on the LID module is not properly connected or the
machine is in soft stop mode and the guide vanes are closing.
LID Screen Dark
Light bulb burned out. Replace as needed.
Table 8 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides
N. Other Problems/Malfunctions (Continued)
Description Remedy