Electrical Connections; Main Power Connection; Cable Entry Point; Terminal Torque Requirements - Telemark Cryogenics 1200 Instruction Manual

2.7 Main Electrical connections
2.7.1 Connect the 3 phase power and the ground to the main isolator.
Note: It may be required that the 3 phase connections have to
be altered to ensure the correct rotation of the compressor
The unit does not require a neutral line; a circuit breaker with a value
suitable for the maximum current draw must be selected and installed in the
OEM vacuum equipment (see specification for current draw). The unit is
phase sensitive and may require the phases to be swapped following initial
start. The compressor is protected against reverse rotation and phase
protection and will shut down automatically. The main power to the unit
should be protected by a breaker located in the OEM system. The size of
the breaker should be such to suit the amperage requirements of the
Cryochiller being used. Please refer to Table 6 for sizing a suitable breaker.
Note: A suitable external switch or breaker may be
2.7.2 The mains power cable should be fixed in place using a cable strain
relief gland so that the cable can not be accidently pulled from the
unit. The "Power Cable Entry Point" size is 1 ⅝" (approx 41mm).
The cable size used must meet local electrical installation regulations
for the voltage and current of the unit.
2.7.3 Connect the power cable to the main isolator to the L1, L2 and L3
terminals and ensuring that the ground (earth) wire is connected to
the PE terminal. Tighten the terminals to 1.6 Nm (15.16 lb-in).
Telemark Cryogenics Microprocessor Based Cryochillers
required close to the equipment
Fig 11 Main Isolator Wiring
Page 26 of 63
Revision 1.0.7 October 2018