Fisher & Paykel SMARTDRIVE PHASE 7 Service Manual page 16

517790D
2.7.2.1 Testing the Stator
If the stator needs to be tested we would first recommend testing the resistance of the windings
from the harness that is connected to the Motor Control Module. (Refer to Section 7).
Note: Ensure that the Rotor or bowl is stationary when measurements are made.
Testing the stator from the console
The resistance of each individual winding is approximately 16 ohms (25.5 ohms aluminium stator),
however when testing the stator from the console we are testing across two windings therefore the
resistance should be approx 32 ohms (25.5 ohms aluminium stator) +/- 10%.
To test all windings you will need to measure across:
• Red & Blue
• Red & Yellow
• Blue & Yellow
If the meter shows an incorrect reading we would then recommend testing the stator from
underneath the machine as there could be a fault in the wiring harness. To test the stator, both
rotor and stator need to be removed. Refer to Sections 10.16 and 10.17.
Note: Two clamp plates are used to secure the Stator, one on each side. The four bolts are
tightened to a torque of 5 Nm. The plastic bolt for securing the Rotor requires a 16mm
socket and should be tightened to 8 Nm.
After removing the Stator, it can now be tested.
Test points are:
Red / Blue
Red / Yellow
Blue / Yellow
The value should be approx 32Ω (25.5 ohms
aluminium stator) +/- 10% across any of the two
windings.
2.7.3 Rotor
The rotor is also unique to the Phase 7 machines.
magnets, as opposed to 14 blocks, containing 4 magnets for Phase 5, and Phase 6 machines.
The rotors between Phase 7 and previous Phases of machines can physically be interchanged,
however electrically they are incompatible.
If a Phase 7 rotor is fitted to a Phase 6 or earlier machine, fault code 240 will occur. Conversely
fault code 240 will also occur if a rotor from a Phase 6 or earlier machine is fitted to a Phase 7
machine.
Apart from the number of magnets the other (and easiest) way to identify the Phase 7 rotor is by
the number of holes. The Phase 7 rotor has larger holes around the outer perimeter and an
additional set of large holes on the inner perimeter.
Testing the Stator
It has 16 blocks containing 3 individual
16
Ω
32.0