– 21 –
Inverter/Motor
The inverter/motor assembly receives 120 VAC,
which the inverter converts to approximately 340
VDC. The inverter then uses pulse width modulation
(PWM) to supply the motor with an AC varying
frequency to control speed.
Note:
There is no location to check inverter output
voltage to the motor. Voltage given is for information
only.
The inverter/motor assembly consists of a motor
and inverter board. A brake resistor is molded into
the underside of the inverter cover and absorbs
energy from the reversing of the motor during the
braking cycle. A Hall effect sensor mounted on the
inverter board measures motor speed (RPM).
The motor and inverter are available only as an
assembly.
WARNING:
Do not attempt to remove the inverter
cover to service the board or brake resistor.
Note:
• There is a non-resettable fuse, located in the
motor harness along the right side of the cabinet.
If the fuse is open, agitate, spin and mode shifting
will not occur. LED will not light.
• If the motor speed sensor fails, the motor will not
run. LED will flash.
• Since the timer receives no feedback from the
inverter motor assembly and if the motor is not
operating, the washer will still fill with water, count
down on the display and drain.
• If during an agitation cycle, water leaks from the
tub and resets the pressure switch,
the inverter
control stops agitation and goes through the
mode shifter spin program to de-energize the
cam and the washer starts to refill with water. The
motor will not run again until the pressure switch
is satisfied, at which time the inverter control will
run the mode shifter agitate program.
• If the mode shifter circuit fails or the coil opens,
the tub will move back and forth with the agitator
during the wash cycle.
To remove the inverter/motor:
Disconnect power.
WARNING:
Exposed terminals, PC board, and
rotating parts may cause injury and/or electrical
shock. To reduce the risk of electrical shock,
disconnect power and allow at least 5 minutes for
capacitors to discharge before servicing motor.
An audible clicking sound will be heard when the
inverter capacitor discharges (in-rush relay closing).
Remove the front panel. (See
Front Panel
.)
Disconnect 3 wire harnesses from the motor.
Release the compression tabs that attach the
wire retainer to the front of the platform.
Remove the belt by rolling it off the bottom of the
motor pulley.
Remove the front two 3/8" motor nuts and loosen
the rear 2 nuts.
1.
2.
3.
4.
5.
6.
(Continued next page)
Cover
Inverter
Motor
Wire Retainer
Belt
Drive
Pully
Disconnect
