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4.2 Accessing the PSU Terminals
Warning. If the PSU is cubicle mounted or has its
cover removed for test purposes, a.c. mains supply
voltage is exposed at certain locations within the
assembly when supplies are connected. Thus, there is a
risk of electrocution.
All normal precautions must be taken to avoid the risk of
accidental electrical shock during installation and
maintenance of the equipment. Ensure that the supply
cable is disconnected at its source before touching any
electrical connections.
Caution. Ensure that the correct version of the unit
has been supplied for the supply voltage available. A 115 V
unit cannot be used with a 230 V supply or vice versa.
Check that the current output meets the katharometer
input requirements (see katharometer data label) – see
Fig. 4.4. If in doubt contact ABB Limited.
Remove the power supply unit cover to obtain access to the
separate labelled terminal blocks – see Fig. 4.2.
To gain access, remove the four
screws and lift off the cover.
Fig. 4.2 PSU Cover Removal
4 ELECTRICAL INSTALLATION
4.3 Electrical Connections
The mains terminal block, TB1, is situated next to the transformer,
T1, and fuses, F2 and F3.
Connect the a.c. mains input cable as in Fig. 4.3.
Note. Earth bonding to be made via M5 Earth Stud.
Connect the d.c. output and 10 V cables as in Fig. 4.4.
M5 Earth Stud
115 V a.c.
or
230 V a.c.
Supply
See Caution opposite
Tighten Cable Gland
Fig. 4.3 Connecting to a.c. Supply
d.c. Output
Terminal Block
F1
TB2
Cable Clamp
E
D
AUX 10V
C
–
+
B
A
Current Output Link
Output Current (mA) Links
500
400
350
250
180
Fig. 4.4 Connecting Outputs
6
230 V
8
T1
115 V
10
TB1
L
N
E
F2 F3
Tighten Cable Gland
To Katharometer
(see manual for
termination details)
X
To Katharometer
temperature control
circuit
(see manual for
termination details)
A to X
B to X
C to X
D to X
E to X
5
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