Service manual

SOI/DT 2007-02 dmm 53/66 599 38 61-92
9.9 Three-phase asynchronous motor
11. Tachometric generator
20. PCB
23. Inverter
24. Motor
X-Y-X = Motor windings
9.9.1 Power supply to motor
Three-phase power is fed by the inverter (4) which sends, through the connectors 5-6-7, the three phases to
connectors 1-2-3 on the motor (nodes V-W-U), where the windings (Y-X-Z-) are connected. The phase shift
between the phases is 120° and peak amplitude is 310V.
The condition of the motor can be determined by
measuring the resistance of the windings:
Winding y ohm 5,4
∼ ±7% (contacts 2-3)
Winding x ohm 5,4
∼ ±7% (contacts 1-2)
Winding z ohm 5,4
∼ ±7% (contacts 1-3)
Winding T (tachometric) ohm 121
∼ ±7% (contacts 4-5)
 The electrical components must be serviced by qualified personnel only.
 Unplug the appliance before accessing internal components.