TECHNICAL INSTRUCTION Sumitomo Heavy Industries, Ltd.
CSW-71C 13
1-3 ELECTRICAL DESCRIPTION
1-3 ELECTRICAL DESCRIPTION
1-3-1 EXTERNAL CONNECTOR
<Warning about electric shock>
This cryocooler includes a high-voltage section. Touching it may result in electric shock. Handle it with extreme
care.
Pay special attention to its wiring when using the external connector on the compressor unit. Connecting a jumper
wire between Pins No.6 - No.8, No.6 - No.13 and No.6 - No.15 may result in misoperation in some of safety devices
in the equipment, causing electric shock, burn or malfunction.
“IMPORTANT”
See “ELECTRICAL SCHEMATIC” of CSW-71C Compressor Unit, for detail.
“IMPORTANT”
The maximum allowable tightening torque of the D-Sub Connector lock screw (#4-40UNC) is 0.17 Nm.
External Connector can be used monitoring the status of the Compressor Unit and the remote control
sequences of the Compressor Unit are described in Table 1.5.
The “D-sub” pins indicated in Figure 1.6 on the control panel for the Compressor Unit can be applied to
an initial condition monitoring for a first-aid diagnostics of the Compressor Unit by means of measuring
the each item with a digital Volt/Ohm Meter. The Fault Condition classified the digital meter reading as
referred to the Table 1.5 can be identified simply an actual operation condition of the Compressor Unit
in the field.
Table 1.5 EXTERNAL CONTROL / ALARM
No.
ITEM OPERATION PIN No.
FAULT CONDITION*
Normal
Close
1
Pressure Alarm
Signal
Contact
Alarm Open
1, 2 > 10
6
ohm
Normal
Close
2
Temp. Alarm
Signal
Contact
Alarm Open
3, 4 > 10
6
ohm
Operate
24V DC(0.15A max.)
3
Drive Indication
DC
Power
Stop 0V
6, 7 0 V
4
Control Voltage
DC
Power
Output 24V DC(0.15A max.),
when Main Power SW is “ON”
7, 13
5
Remote Reset
Relay
Pulsed 24VDC for 1 second
to be furnished by user.
12, 14
Drive Close
6
Remote Drive
Contact
Stop Open
8, 15
* Digital Volt./Ohm Meter Reading
91015 14 13 12 11
8 1234567
Figure 1.5 EXTERNAL CONNECTOR WIRING ON THE COMPRESSOR UNIT
WARNING
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