Edwards PGC201, Instruction Manual

Page: 27 / 68

D0300040001EN - Installation
Page 17
The mains connection on the rear panel (see Figure 5 ) is not intended for use with a mains
cord designed for use with heating apparatus.

Insert the plug of the mains cord into the mains socket provided on the instrument.

Insert the mains plug of the mains cord into the mains outlet.
Earthing
With the aid of the earthing screw (see Figure 5 item 2) the PGC201 can be connected to the
protective ground of the vacuum chamber.
PRG measurement channels (PRG 1 and PRG 2)
The connections PRG 1 and PRG 2 (see Figure 5 )
allow the connection of up to
two PRG gauge
heads (see Connectable gauge heads ).
Connecting:

PRG 1: connect the gauge head using the corresponding connecting cable to
connection PRG 1 on the rear of the PGC201.

PRG 2: connect the gauge head using the corresponding connecting cable to
connection PRG 2 on the rear of the PGC201.
CPG measurement channel (CPG)
WARNING:
The vacuum chamber earth should be connected to the PCG201 protective earth terminal
on the rear of the instrument.
WARNING:
A special cable from Edwards is required for connection to PRG1 and PRG2. The ground
connection (see
Figure 5 ) of the special cable must be connected to the ground connection
on the rear of the instrument.
CAUTION:
Gauge heads which have not been designed to be operated in connection with the PGC201
or which do not comply with current EMC guidelines can impair operation of the
instrument or even damage it. Always operate the PGC201 with approved gauge heads,
see
Connectable gauge heads .
WARNING:
The CPG gauge head is powered by an HT voltage source (ignition voltage 3.3 kV; operating
voltage 1.7 kV / R
i
= 6.6 M

).