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ORIG, SE, SG: LOW UNLOADED SUMP
UNLOADED OR STARTING
AFTER TRANSITION
= UNIT UNLOADED AND SUMP PRESSURE IS LESS THAN 15 PSI FOR 10 SECONDS
CHECK SENSING LINE TO 3APT
AND SENSOR 3APT. SEE PROCEDURE 2.4
NO. SUSPECT SLIPPING COUPLING
BAD STEPPER MOTOR. SEE PROCEDURE 2.1
BAD DRIVER CHIP. SEE PROCEDURE 2.2
MPCV STUCK OPEN IF PUMPING INTO AN OPEN
SYSTEM
IF NONE OF THE ABOVE THEN PROBABLY
A BINDING INLET VALVE.
IF NOT OK, THEN REPAIR AND RETEST
IF OK, IS BLOWDOWN AIR CAUSING THE VALVE TO CLOSE TOO FAR?
YES. MAKE SURE BLOW DOWN
DEFLECTOR IS IN PLACE. IF NECESSARY,
BEND DEFLECTOR TO DEFLECT AIR
UPWARD
SE CONTROLLER
FULL VOLTAGE? YES OR
YES. CHECK FOR INLET VALVE STUCK CLOSED OR
BROKEN SPRING IN INLET VALVE.
NO. CHECK BLOW DOWN SILENCER ADJUSTMENT.
MAKE SURE MAKE UP PORTS IN INLET VALVE ARE OPEN.
BLOCKAGE IN SENSOR LINE FROM SUMP
TO 10SV
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