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Schematic for the inside of GE washer motor inverter

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I am really disappointed in the technical data sheet supplied by GE for their washer Md.WWSE5240G2WW. There isn't even a

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Old 02-28-2013, 04:57 PM
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Default Schematic for the inside of GE washer motor inverter
Model Number: WWSE5240G2WW   Brand: GE   Age: 1 - 5 years   

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I am really disappointed in the technical data sheet supplied by GE for their washer Md.WWSE5240G2WW. There isn't even a motor on the wiring diagram. Yes, I know the inverter sits on top of the motor, but I would like a diagram of what is happening inside the inverter so we could see how power gets to common start and run on the motor.

Can anyone tell me where I can find information on this?

Also, in the "Field Service Mode" in the block chart the first column listed is "Display". Where is the display? And, what is "EEPRON" stand for as an error code (fifth line down under "Function" in the block chart.


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  #2 (permalink)  
Old 02-28-2013, 05:34 PM
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This is not a simple single phase AC motor as used in older GE and other brand washers. It is a 340 volt 3-phase PWM (pulse width modulated) DC motor whose windings are connected directly to the inverter board. EEPROM is a memory chip (electrically erasable programmable read only memory). For models without the 2-digit display, you use the status LEDs when in service mode.

Eric
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Old 01-06-2014, 09:03 AM
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If still interested, I'm also looking for a schematic of the inverter.

I had started drawing a schematic of the PCB of the 300V doubler and have researched a few parts.
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Old 01-07-2014, 06:09 AM
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Ok.

This motor uses a voltage doubler to produce 300V+ DC to excite it's 3 phase windings. The big black capacitors and a couple of heat-sinked diodes forms the doubler section. The Line goes to a thermal fuse in the winding, them backs to a 0.3 ohm protective resistor and a kind of varistor, then enter to the voltage doubler. In some models I found a shunt relay K1. once the capacitors charge and all stabilizes, the relay shorts the protective resistor and the varistor, avoiding a huge surge that could break the in-line fuse on the Neutral side.

Then, the important pieces for me is a VIPER12A or VIPER12E IC that is feed with the 300V and provides PWM stepdown voltage to L1 coil for the drive circuit. Further, this voltage goes to a 7805 8 pin IC that provides the 5V logic power supply. There are some diodes and zeners involved. I almost finish my schematic, will publish once I revise it. Some patience need to remove the white sillicone blobs over some pieces.

The CPU uses Freescale chip to do the job.

The 3 phase windings are connected to a 3 pair of SCR or MOSFET (need to check the part number) that provides the PWM in correct sequence to make the rotor to turn.

One interesting thing is the PCB has some slots cut at the sides that looks works as testing access. Looks some connector slides on the cuts and allows to measure the voltages. There is one cut to measure the +/-High voltage side, and other to measure the drive and logic power supply.

There is a cople of kind of JTAG testpoints, probably to flash the Freescale and the EEPROM chip.

I need to finish my hand-schematic, it will include part numbers.
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Old 01-07-2014, 07:18 AM
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Quote:
Originally Posted by ppaing126 View Post
The 3 phase windings are connected to a 3 pair of SCR or MOSFET (need to check the part number) that provides the PWM in correct sequence to make the rotor to turn.
Probably IGBT's. Look forward to your results. I spent 37 years as an electronics tech with the Navy (military and civilian) and have done my share of reverse engineering projects.

Eric
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