TECHNICAL DESCRIPTION
KMW200CCD
Version 1.1
USER MANUAL
KMW200CCD Chiller v1.1
Page
7
4.2 Operating Principles
Inside the KMW200CCD, the compressor is connected to a radiator that is immersed in the water
reservoir. A thermostat connected to the compressor ensures that the temperature of the water in
the reservoir stays in the range 12-14 ºC (or higher depending on the dew point of the operating
environment), as required by the CCD detector.
The control circuitry of the KMW200CCD has a logic unit. The logic unit checks signals from:
1. Temperature and water level sensors inside the water reservoir
2. A flow sensor
3. The water pump
4. The
compressor
Refer to Figure 4.2.1 for a schematic diagram of the control circuit.
Lamps
Logic PC B
Flow
sensor
DRG NO.
DRA W N B Y:
AP PROW ED BY:
TITLE:
FILE:
DATE:
REV.
SHE ET
1 of 1
A. No.
Appr
.
Date
R . S.
KM W 200C CD w ater chiller unit
E lectrical block schem e
\\KUMA\workgroups\electronics\
KMW 200CCD\
10.2002
Mains
filter
M AINS
230V AC
C CD o u tp ut
230V AC
Key switch
Temperature
sensor
Level
sensor
W ater
pump
Therm ostate
Com pressor
Fan
E
W
-
0
2
-
0
0
-
0
0
1
-
A
Figure 4.2.1 Schematic Diagram of the Control Circuit
4.2.1 Water Conditioning Check
The KMW200CCD performs a water conditioning check when it is initially switched on. This check
looks at:
1. The flow rate of the water
