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CONTENTS
1
INTRODUCTION ................................................. 1
1.1
General ...................................................... 1
1.2
Description ................................................. 1
2
SPECIFICATION ................................................. 2
3
MECHANICAL INSTALLATION .......................... 3
4
ELECTRICAL INSTALLATION ........................... 4
4.1
Cable Requirements .................................. 4
4.1.1
Katharometer Connections ............ 4
4.1.2
Temperature Control Circuit ........... 4
4.2
Accessing the PSU Terminals .................... 5
4.3
Electrical Connections ............................... 5
5
SERVICING ......................................................... 6
5.1
Fuse Replacement ..................................... 6
Warning. Hazardous Voltages
There are no servicable parts in this unit.
Please return to the manufacturer if faulty,
or seek the services of a qualified engineer.
Ensure that the mains supply is switched
off and disconnected before removing the
cover for any reason.
1 INTRODUCTION
1.1 General
This instruction manual describes the installation and
operation of the 4234 600 Series Power Supply Unit (PSU),
designed to provide a stabilised (optional 500, 400, 350, 250
or 180 mA) d.c. supply for operation of a single katharometer
unit and an auxiliary 10 V d.c. supply for katharometer
temperature control.
1.2 Description - Fig. 1.1
The PSU is available in two separate versions defined in
Section 2.
The unit is housed in a metal case fitted with mounting lugs.
Cable gland entries are provided at opposite ends of the case
for supply voltage input and output cables respectively.
A printed circuit board assembly (see Fig. 1.1) contains the
circuit components. The supply voltage input is connected to
terminal block (TB1) located on the pcb, adjacent to the fuses
F2 and F3. The constant current output terminal block (TB2) is
located on the gland assembly at the opposite end of the
assembly. The auxiliary 10 V output terminal block (AUX 10V)
is located on the PCB near to TB1. The pcb is mounted on a
steel chassis and secured by six screws. The cover is
perforated to allow ventilation for cooling.
Two identical fuses (L & N) are mounted within the unit on the
mains input. A third fuse is connected in the d.c. line circuit of
the transformer. A fourth fuse is connected in the auxiliary
10 V d.c. line. The L & N fuses are a high breaking capacity
type and must only be replaced with identical types. See
Section 2 for rating.
M5 Earth Stud
6
230 V
8
115 V
∅5 to
10
9 mm
Cable
F2 F3
Cable Gland for
a.c. Mains Input
Fig. 1.1 Location of Internal Component
Note. The PSU has NO serviceable parts.
d.c. Output
Fuses
Terminal Block
F1
T1
TB1
F4
-
+
L
N
E
AUX 10V
Output
Mains Input
Current
Terminal Block
Links
Cable Gland for
d.c. Output to
Katharometer
TB2
∅5 to 9 mm
Cables
E
D
C
X
B
A
Cable Gland for
10 V Output to
Katharometer
1
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