GA 12.137/2.02 - 05/2002
Installation
16
2.5 Electrical connection
Warning
Potentially fatal voltages are present in the
compressor unit. Before beginning any
work on the compressor unit, switch it off
and isolate it from the power supply network
(lock out and tag power).
The line joining the compressor unit and the
cold head may be connected or disconnec-
ted only after the compressor unit has been
switched off and separated from the line
supply. Electrical shock hazard! Moreover,
the compressor unit and the cold head
could be damaged.
To avoid electrical shock, always connect
the equipment to a low impedance ground.
The electrical connection/disconnection
shall be made only by a qualified and licen-
sed electrician in accordance with VDE
standard 0105, in compliance with the gui-
delines set forth in VDE 0100, and obser-
ving local codes.
Setting the compressor unit to the line voltage
The compressor unit can be adjusted to operate on
various line voltages. Refer to Section 1.3 for the per-
missible values for the compressor unit and the factory
setting. Observe the information on the tag attached to
the compressor unit.
Caution
If the line voltage differs from the value sta-
ted on the tag, it is essential to reconnect
the terminals on the Power Module.
Do not use the terminals for 230 V. Using
these terminals may damage the power
module and the cold head.
To make the setting, first remove the cover plate; see
Fig. 11 left. Then the terminals for mains voltage and
coldhead motor type are visible. Do not use the 2.0 mm
screwdriver delivered with the compressor unit. Use a
Phillips screwdriver instead. The 2.0 mm screwdriver
shall exclusively be used on the mains voltage and the
motor type selector terminal slits; see below.
Caution
Connect all three phase leads - L1, L2 and
L3 - to the correct voltage value on the ter-
minal strips CM2 and CM3; see Fig.11
middle. Using the wrong terminals may
damage the power supply and the cold
head.
To detach the leads from the terminal strips, insert the
screwdriver (2 mm width) into the slits, press on the ter-
minals and pull out the lead with a pair of pliers. Hold the
screwdriver horizontally and do not jam it.
Insert the leads as far as possible without using the
screwdriver. By pulling the leads verify that they are
safely fixed. If not repeat the procedure.
Changing the setting of the cold head motor
All Leybold cold heads can be operated in the setting for
2-phase alternating current.
All Leybold cold heads with a type designation beginning
with “RGD 5/100“or “COOLPOWER 5/100“ can also be
operated on 3-phase (rotary) current. The compressor is
set this way at the factory.
Caution
For all cold heads except RGD 5/100 .. or
COOLPOWER 5/100 .. the setting must be
2-phase alternating current.
For changing the setting of the cold head motor type
reconnect all three terminals CM6 to CM8; see Fig. 11
middle and right.
Screw the cover plate back in place after altering the set-
ting. You are strongly advised to make a note of all chan-
ges made, both on the compressor unit and in the Ope-
rating Instructions.
Connecting the cold head and power supply
Plug the electrical connecting lead of the cold head into
the socket COLD HEAD.
Connect the power cord to the compressor unit’s socket
and the power cord’s terminals to the mains.
