GEA Bock HG4 CO2 - Manual (Page 13)

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5| Electrical connection
5.2 Standard motor, design for direct or partial winding start
Designation on the name plate Sticker on the terminal box
Y/YY
Compressors with this marking are suitable for direct or partial winding start. The motor winding is
subdivided into two parts: Partial winding 1 = 66% and part winding 2 = 33%. This winding division
reduces the start-up current needed for a part winding start to approx. 65% of that for a direct start.
400 V
Direktstart YY Teilwicklungsstart Y/YY
1V1 1W1 1U1
2W1 2V1 2U1
L3 L2 L1 L3 L2 L1
L3 L2 L1
1V1 1W1 1U1
2W1 2V1 2U1
Direct start YY Part winding start Y/YY
The motor is wired for direct start (YY) at the factory. For part winding start (Y/YY) the bridges must be
removed and the motor feed line connected according to the circuit diagram:
INFO A mechanical unloaded start with bypass solenoid valve is
not required
ATTENTION Failure to do this results in opposed rotary fields and results in
damage to the motor. After the motor starts up via partial winding
1, partial winding 2 must be switched on after a maximum delay
of one second . Failure to comply can adversely affect the service
life of the motor.