TECHNICAL INSTRUCTION Sumitomo Heavy Industries, Ltd.
CSW-71C 19
2-2 INPUT POWER CABLE CONNECTION
2-2 INPUT POWER CABLE CONNECTION
<Warning about electric shock>
Make sure the power specification of the cryocooler used conforms to the customer's power supply before using the
equipment. Using the cryocooler with a non-conforming power supply may result in electric shock or malfunction.
Be sure to turn off and Lock Out with OFF position the main power of the customer's power source before connecting
or disconnecting the input power cable to the Compressor Unit, and then remove the input power cable from the main
power. Failing to observe this precaution may result in electric shock.
Do not change the setting of the dial above the main power switch of the compressor unit under any circumstances.
Failing to observe this precaution may result in electric shock.
<Caution against misoperation>
Do not use inverter for the main power source of the compressor unit. Operating with inverter may result in the
damage or malfunction of the compressor electric circuit.
Avoid using the transformer for the main power source of the compressor unit. If the transformer is installed at the
upstream of the unit, lacking phase protection circuit with the cryocooler occurs in a malfunction. That may result in
misoperation or malfunction. When using the transformer, install the other lacking phase protection device in
upstream of the transformer.
“IMPORTANT”
This cryocooler is provided with a phase reverse protection circuit for the input power. If the input
power is connected with reverse phase, the cryocooler does not start.
“IMPORTANT”
See “ELECTRICAL SCHEMATIC” of CSW-71C Compressor Unit, for detail.
“IMPORTANT”
See “INPUT POWER CABLE LV” of “DRAWINGS” for detail.
Make electrical connection as follows;
Upstream Protection
Use the fuses or circuit breakers as upstream protection of L1, L2, L3. The recommended rating of
the protection is maximum 60A.
Power Supply Conductor and Protective Earth Conductor
Use 75 deg.C wiring sized to 60 deg.C ampacity.
Use copper conductor only. AWG 8 (8.3 mm
2
) or larger.
Compressor Unit Side
Power Supply Conductors Protective Earth Conductor
Striping Length: 12 mm Striping Length: 12 mm
Tightening Torque: 1.3 Nm Tightening Torque: 1.8 Nm
User’s Power Source Side
Power Supply Conductors Protective Earth Conductor
Striping Length: 12 mm Striping Length: 12 mm
WARNING
CAUTION
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