Installation
6-6
5) Make certain the cooling water flow rate and inlet temperature meets the
requirements in Section 5.
6.5.3 Connect the compressor package to the main power
CAUTION
A voltage deviation of more than 10% above or below the voltage rating can cause
compressor motor overheating and possible failure. Indications of operation outside
that voltage range will void the compressor warranty.
1) The system MUST be connected to a dedicated circuit breaker. The breaker must be
mounted near the compressor package, within easy reach of the operator, and must
be marked as the disconnecting device for the system. Specifications for circuit
breakers vary according to the system’s operating voltage. See the electrical
specification tables in Appendix A for more information.
2) The compressor package comes with a main power cord attached. Assure that the
length of the cord is sufficient to safely connect to the power source. If the cord is not
sufficiently long, adjust the location of the compressor package.
WARNING
Be sure to follow all local electrical codes and guidelines.
3) Make sure that the dedicated circuit breaker is turned OFF.
4) The ground (or earth) wire in the power cord is either green (60 Hz systems) or
green/yellow stripe (50 Hz systems). Connect the ground wire in the power cord to
the ground (or earth) connector in the breaker panel, making sure to tighten the wire
into the connector securely. It is important not to disable this wire.
5) Connect the remaining hot wires in the power cord to the corresponding lugs on the
dedicated breaker in the breaker panel, making sure to tighten the connector
securely. For 3 phase compressor packages, the order of the wires is not important
at this time - correct order will be determined in Section 7.
WARNING
One lead of the compressor package is grounded. Never bypass this ground or
attach the compressor package to an ungrounded circuit. A dangerous electrical
hazard will develop.
6.5.4 Connect the helium flex lines to the cold head and the
compressor package
CAUTION
Follow the procedure carefully when connecting and disconnecting the helium flex
lines. Failure to follow the procedure can cause accidental coupling disassembly,
destruction of the sealing O-ring, and helium loss.
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