User's Manual Rev B / February 2021 / M125 Helium Compressor
97-00020-000
15
6
Operations
6.1
Before Switching ON the System
After the compressor unit and its load (cryopump, cold head, etc.) are installed and connected, check the helium gas
pressure as indicated by the pressure gauge mounted on the rear panel of the compressor unit. Refer to Table 4-3, for the
proper static pressure readings for the compressor.
If the helium pressure needs to be adjusted, refer to Sections 8.4.1 and 8.4.2
for procedures to release helium gas in order
to reduce the pressure or to fill the compressor with more helium gas to increase the pressure.
Do not remove the top cover of the compressor unit. Doing so will disable the unit due to the built-in safety interlock
mechanism.
6.2
Normal Operation
The load of the compressor can be powered through the power connectors located on the front panel of the compressor.
To start operation of the compressor and its load, do the following:
1.
Open the coolant supply (water-cooled compressor model only).
2.
Switch on the main power source.
3.
Press the ON button to start the compressor. Both the compressor and its load should start simultaneously.
During operation, check the coolant flow rate (water-cooled compressor) and the operating pressure frequently. Refer to
Table 4-3 for required coolant flow rate. If it is too slow, make sure any problems associated with water supply or water
outlet are resolved. Refer to Table 4-3 for proper helium pressure level for the compressor unit. If the helium pressure is
too low, switch off the compressor unit. It may be necessary to perform a helium "topping-up" maintenance procedure as
described in Section 8.4.1. If pressure drop-off happens frequently, there may be a substantial leak in the helium circuit of
the compressor. In this case, contact Trillium US Inc. customer service immediately (see Section 2.2).
To shut down the compressor unit, press the OFF button on the front panel. After that, allow coolant to continue to
circulate for at least 10 more minutes before shutting off flow.
7
Troubleshooting
7.1
Troubleshooting Activities
Table 6-1 describes some problems that users might encounter while operating the Model 125 Cryopump Compressor and
provides solutions to those problems.
If a compressor problem still persists after performing the corrective actions described in this section, please contact
Trillium US Inc. Technical Support for further assistance (see Section 2.2).
Table 7-1: Trouble Shooting Procedures
Problem
Possible Cause
Corrective Action
The compressors On/Off
switch (SW1) remains in
the
On position when switched
on, but the pump does not
run.
1
No power is coming from the power
source.
2
Incorrect or disconnected wiring
within the compressor
1
Check service fuses, circuit breakers,
and wiring associated with the power
source. Repair as needed.
2
Check the compressor against the wiring
