Carrier PC211 Table 10N Other Problems/Malfunctions (Continued)

SMM
Communications
Failure
Check that PSIO commu nication plugs are connecte d correctly. Check SMM com -
munication plug. Che ck for proper SMM power s upply. See Control M odules sec-
tion.
High Oil
Temperature
While Running
Check for proper oil l evel (too much oil). Check that TXV valve is op erating prop-
erly.
Blank LID Screen Increase contrast potent iometer. See Figure 42. C heck red LED on LID for prop er
operation, (power supp ly). If LED is blinking, but gr een LED’s are not, repl ace LID
module, (memory failure).
‘‘Communications
Failure’’
Highlighted
Message At
Bottom of LID
Screen
LID is not properly address ed to the PSIO. Make sure that ‘ ‘Attach to Network
Device,’’ ‘‘Local Devi ce’’ is set to read th e PSIO address. Check LED’s on PSIO. Is
red LED operating prop erly? Are green LED’ s blinking? See control module trou-
bleshooting section.
Controls Test
Disabled
Press the ‘‘Stop’’ push button. The PIC must b e in the OFF mode for the co ntrols
test to operate. Clear all alarms. Check line v oltage percent on Stat us01 screen.
The percent must be w ithin 90% to 110%. Check vo ltage input to SMM, c alibrate
starter voltage poten tiometer for accuracy.
Vanes Will Not
Open In Control
Test
Low pressure alarm is ac tive. Put machine into pump down mode or equalize pres-
sure. Check guide vane ac tuator wiring.
Oil Pump Does
Not Run
Check oil pump v oltage supply. Co oler vessel pressur e under vacuum. Pr essurize
vessel. Check temper ature overload cutout s witch.
Table 10N — Other Problems/Malfunctions (Continued)
Description/
Malfunction Probable Cause/R eme dy