Troubleshooting
Compressor runs, but cold
head valve motor operation is
abnormal
Wrong cold head cable. Be sure correct cold head cable
is connected (Page 56.)
Cold head problem. Consult cold head manual.
Gradual loss of helium gas
pressure.
Gas is leaking from the
compressor.
Leak check the compressor and
repair.
Compressor runs; elapsed
time meter does not run.
Defective elapsed time meter
or motor contactor.
Consult a SCAI Service Center.
AVOID INJURY. The compressor’s elapsed time meter contains a lithium
battery. Do not remove the battery. Do not recharge, disassemble, mutilate, wet
or dispose of the meter in fire. Contact local environmental authorities for proper
disposal of the lithium battery.
Compressor Capsule
Compressor motor checks for winding continuity, resistance and grounding will isolate most
motor electrical problems. Current measurements will separate a locked rotor condition from
other electrical problems. When the checks indicate a faulty compressor, a replacement is
needed. Contact a SCAI Service Center.
AVOID ELECTRIC SHOCK. Disconnect the power to the compressor before
troubleshooting the electrical components.
AVOID INJURY FROM BURNS. During operation, some surfaces under the
compressor’s cover become hot. Allow the compressor to cool for 1/2 hour after
shutdown before removing the cover for maintenance.
AVOID ELECTRIC SHOCK. Permit only qualified electrical technicians to open
electrical enclosures, to perform electrical checks or to perform tests with the
power supply connected and wiring exposed. Failure to observe this warning can
result in serious injury or death.
Winding Continuity, Grounding and Resistance Checks
Tools required: Ohmmeter or multimeter
#2 Phillips screwdriver.
1. Disconnect the power to the compressor.
To Next Page
Loading...
