GA 12.137/2.02 - 05/2002
Description
5
Safety equipment Display on the compressor unit
1 Pressure switch (PSL): pressure difference between 1.: SYSTEM ERROR
low-pressure helium and atmospheric pressure < 2.0 bar 2.: Pressure Alarm
2 Thermal switch (TSH1): Helium temperature 1.: SYSTEM ERROR
downstream of heat exchanger > 38 °C (100 °F) 2.: Helium temp.fail
3 Thermal switch (TSH2): Helium temperature 1.: SYSTEM ERROR
upstream of heat exchanger > 100 °C (212 °F) 2.: Oil cct. fail
4 Thermal switch (Klixon) in compressor capsule 1.: SYSTEM ERROR
2.: Compressor fail
5 Motor protection switch (integrated in main switch) Switch set to 0
6 3 fuses for cold head and input voltage of power module No display or
(F1, F2, F3, accessible from outside) 1.: SYSTEM ERROR
2.: Phase/Fuse ERROR
7 2 fuses for control voltage (internal) No display
8 Bypass valve: opens a shunt between the high- and low-pressure No display
helium circuits if the pressure differential exceeds the preset value
9 Safety valve: opens the helium circuit to the atmosphere if the No display
high-pressure segment exceeds 29 bar (406 psig; 2.9 MPa)
10 Microprocessor for checking the phase rotation 1.: SYSTEM ERROR
2.: Phase/Fuse ERROR
If any of the safety features from 1 through 7 or 10 opens, this will cause the compressor unit to shut down.
Press the SELECT button to read messages 2 and 3.
Safety equipment and displays in case of corresponding failure
1.2 Standard equipment
The compressor units are shipped from the factory filled
with helium and oil. They are equipped with
– detachable crane eyelets,
– sliding rails,
– an integrated main switch including the motor protec-
tion switch.
The self-sealing couplings are closed off with protective
caps.
Accessories also supplied with the unit are:
– 2 certificates of compliance with section 9 of the
German pressurized vessels code,
– 1 adapter (6 mm Swagelock —
1
/
4
” self-sealing
coupling),
– 2 clamping rings (spare parts for water connection),
– 6 spare fuses 0.315 A T
– 1 screwdriver 2.0 mm exclusively for mains voltage
and cold head motor type selection,
– 1 open-end wrench 1“,
– 1 open-end wrench 1
3
/
16
“.
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