Fisher & Paykel 517735 Motor Controller Module, Water Level Measurement Pressure Sensor

4.3Motor Controller Module

This module contains the circuitry needed to control the water valves, pump and the motor. It also recieves signals from the rotor position sensor, pressure sensor and the display module.

The Motor Controller Module and Display Module are continuously communicating. The Motor Controller Module supplies the Display Module with 15v (11v min 17v max). The two Modules are connected together with a 3 way harness, (Phase 1-4), or a 4 way harness, (phase 5).

The electronics in the Motor Controller Module, (Phase 1-4 only) are cooled by water, Phase 5 is air cooled. The inlet chamber is a separate part to the Motor Controller Module. The inlet chamber serves two purposes: -

•Phase 1 to 4. Water cooled. During filling, water is flowing through the chamber continuously and cooling the electronics. During spin cycles, if the electronics becomes too hot, the cold valve will purge. A small quantity of water may be discharged into the bowl during the cycle.

•Mixing the incoming hot and cold water is part of the automatic wash water temperature system. A thermistor measures water temperature and enables the water temperature to be controlled.

The Motor Controller Module contains an EEPROM which stores information on Smartdrive operation such as faults and diagnostic information. Information on the last fault is retained in the memory. This memory is also used to store Favourite Cycle data, Optional Adjustments Mode data (see later) as well as special data stored during manufacture. All this memory will be retained when Smartdrive is powered off.

•If Motor Controller has No Power. See Section 6.1.

•Phase 1. Original Motor Controllers have a replaceable fuse. 6A 32mm slow blow. For diagnostics see WM51 in Appendix B.

•Phase 1 (spare) these are essentially Phase 4 functionality. See WM011 in Appendix B.

•Phase 1, 425775. These modules stirred at 30 RPM because Smartdrive was noisy. Replace suspension rods is a better solution. 425775 is now obselete.

•Phase 2-4 check that a blade divider (p.n. 425842) exists within the heatsink.

•Phase 4-5. When replacing Motor Controllers ensure that size setting mode is entered to set size.

•Phase 1-3. When replacing Motor Controllers enter option adjustment mode to set size.

•The colour of the Motor Controller identifies the phase and must match that of the display. Blue (or white) is Phase 1, Blue is Phase 2. Green is Phase 3. Yellow is Phase 4 and grey is Phase 5.

•Pressure pipe must only be reconnected when the bowl is empty of water, otherwise the bowl will flood. Blow down pipe to release any water droplets before reconnecting.

•Smartdrive is not isolated. Even 15v will be live.

•Phase 1-4 use water cooling. Dry out topdeck area before refitting.

•Phase 5 has a standby mode. The 15v will power off at the end of the cycle or after 15 minutes without use. The power button must be used to wake up Smartdrive.

•Phase 5 uses the pump as part of the power supply. If the pump blocks Smartdrive could power off!

Water Level Measurement - Pressure Sensor

Smartdrive is fitted with a pressure sensor which can fill to any water level. The pressure sensor is incorporated within the Motor Controller and cannot be removed. The pressure pipe connects from the Motor controller to the air bell at the bottom of the outer bowl. It is part of the harness assembly. On Phase 1 the pressure sensor is on the Display Module.

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