GEA Bock HGX2 CO2 T - Manual (Page 13)

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INFO! Mechanical start unloader with bypass solenoid is not required.
In the factory, the motor is switched for direct starting (YY). For part winding start (Y/YY), remove the
bridges and connect the motor feed cable according to the circuit diagram.
L1
L2
L3
L1
L2
L3
L1 L3 L2
PTC
PW
II
PW I
PTC
400 V
Direct start YY Part winding start Y/YY
5 | Electrical connection
5.2 Standard motor, designed for direct or part winding start
Designation on the name plate Sticker on the terminal box
Y/YY
Compressors marked in this way are suitable for direct or part winding start. The motor winding is
divided into two parts: part winding 1 = 70% and part winding 2 = 30%. This winding devision redu-
ces the start-up current during a part winding start to approx. 65% of the value for a direct start.
ATTENTION! Failure to comply results in reversed fields of rotation and can
cause motor damage. After the motor has started up with part win-
ding 1, part winding 2 must be switched on after max. 1 second
delay. Failure to comply can be detrimental to the service life of the
motor.
ATTENTION! Ensure that power is supplied via K1 to winding 1 (70%) (1U1 /
1V1 / 1W1) and via K2 to winding 2 (30%) (2U1 / 2V1 / 2W1). The
motor contactors (K1/K2) are each to be rated for approx. 70% of
the max. operating current.