GA 12.107/5.02 - 12/97
16
Operation
3 Operation
3.1 Switching on
Open the coolant inlet.
Switch on the compressor unit at the master switch. Volt-
age will be supplied to the connector circuit for the cold
head at the same time and the cold head connected here
will be started.
After a longer period in service, operating pressure
should stabilize at approx. 22 bar (319 psig), read at the
compressor gauge on the compressor. During the start-
ing phase, pressure will temporarily be higher.
3.2 Normal Operation
During operation, check the operating pressure and the
coolant flow rate at regular intervals (at least every 6
months).
Refer to Section 1.3 for nominal values.
If the helium pressure is too low during operation, switch
off the compressor unit and find the cause; refer to Sec-
tion “Troubleshooting”.
If the coolant flow rate is insufficient, eliminate potential
malfunctions in the water supply or at the water outlet. If
deposits of calcium or grime have collected in the heat
exchanger, switch off the compressor unit and inform the
Leybold Service Department.
Safety devices are integrated into the compressor unit to
protect the device during operation; refer to the table in
Section 1 for details.
3.3 Switching off
Manual shut-down
Turn off the compressor unit at the master switch.
Allow the coolant to circulate for 10 minutes following
shutdown and then close off the circuit.
Automatic shut-down
The compressor unit will be shut down automatically if
insufficient helium pressure or excessive helium temper-
ature is detected.
The malfunction message will remain visible in the dis-
play even after the effects have diminished; the com-
pressor unit will not restart automatically.
The malfunction indication will remain stored in memory
even in case of a power failure.
Find and rectify the cause of the malfunction. Then
press the
RESET
button. The compressor unit will then
restart.
If a circuit breaker is tripped, the compressor unit will
automatically be switched off.
Find and eliminate the cause of the malfunction. The
compressor will restart when the button on the circuit
breaker is pressed.
The compressor unit will be switched off in case of
excessive motor current. In this case the master switch
will be at its “0” position.
Locate and eliminate the cause of the malfunction and
switch the compressor unit back on at the master switch.
If the temperature of the compressor motor is too high,
the compressor unit will be switched off without indica-
tion of the malfunction.
Warning
The compressor unit will switch back on
automatically once the compressor motor
has cooled down (approx. 1 to 2 hours).
If the power module gets too hot, the compressor unit will
be switched off without indication of the malfunction.
Actions following a power failure
When power is restored after a temporary failure of the
line voltage, the compressor unit will automatically return
to its previous operating status.
Summary of Contents for RW 6000-1
Page 23: ...GA 12 107 5 02 12 97 Notes 23...
