HELIX 8200 Operating And Service Instructions page 28

Appendix B - Troubleshooting Procedures
Problem
3) Compressor stops
after several minutes of
operation and remains
off.
B-2
Table B-1: Compressor Troubleshooting Procedures
Possible Cause
1) High temperature of the
compressor is caused by insuf-
ficient cooling water, resulting
in the opening of thermal pro-
tective switch (water-cooled
compressor only).
2) After turn-off, very cold
cooling water was left running
through the compressor. The
resulting low oil temperature
has caused a restriction of oil
flow through the metering ori-
fice during startup.
3) Very cold cooling water is
circulating through the com-
pressor. The resulting low oil
temperature causes a restriction
of oil flow through the metering
orifice during startup.
4) Ambient temperature is
unusually high resulting in the
opening of the thermal protec-
tive switch (air-cooled com-
pressor only).
5) Insufficient helium supply
pressure is indicated by the sup-
ply pressure gauge.
6) High temperature of the
compressed helium in the dis-
charge line from the compres-
sor pump has tripped the
thermal protective switch.
7) Mechanical seizure.
-
C TI CRYOGENICS
HELIX TECHNOLOGY CORPORATION
Corrective Action
1) Confirm that cooling water to
the compressor is flowing. Con-
firm that proper cooling water
flow rate and pressure exist by
referring to Figure 3-3.
2) Turn on the compressor and
allow it to run until it has stopped
several times, allowing the oil
temperature to rise and the com-
pressor to operate continuously
for one hour minimum.
3) Recheck for proper cooling
water temperature per, Cooling
Water Requirements (Water-
Cooled Compressors Only).
4) Provide a free flow of air to the
compressor. Confirm a 12-inch
(30 cm) clearance at the front and
back of the compressor. Confirm
unobstructed and clean heat
exchanger surfaces.
5) Add helium per, Unscheduled
Maintenance.
6) Confirm that oil is visible in
the compressor sight glass (air-
compressor only).
7) Contact the Product Service
Department.
P/N 8040353