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6 | electrical connection – GEA Bock HGZ7 User Manual

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6| Electrical connection

6.1 Information for contactor and motor contactor selection

INFO

Connect the compressor motor in accordance with the circuit diagram
(see inside of terminal box).

Use suitable cable entry point of the correct protection type (see

name plate) for routing cables into the terminal box. Insert the strain
reliefs and prevent chafe marks on the cables.

Compare the voltage and frequency values with the data for the

mains power supply.
Only connect the motor if these values are the same.

DANGER

Risk of electric shock! High voltage!
Only carry out work when the electrical system is disconnected
from the power supply!

6 Electrical connection

All protection devices and switching or monitoring units must be fitted in accordance with the local
safety regulations and established specifications (e.g. VDE) as well as with the manufacturer’s infor-
mation.

Motor protection switches are required! Motor contactors, feed lines, fuses and motor

protection switches must be rated on the basis of the maximum working current (see name plate).
For motor protection use a current-dependent and time-delayed overload protection device for moni-
toring all three phases. Set the overload protection device so that it must be actuated within 2 hours,
if there is 1.2 times the max. working current.