Unbalance Control System - Maytag Neptune MAH3000 Service Manual

Figure 2-11 Figure 2-11 Figure 2-11
Figure 2-11 Figure 2-11
The motor control monitors the signals and
communicates this information to the ma-
chine control. The purpose of this signal is to
tell the motor when to energize each winding
in the motor and to tell the machine control
the actual motor speed.
If the machine control board does not If the machine control board does not
Note: If the machine control board does not Note: Note: Note: Note: If the machine control board does not If the machine control board does not
receive an input signal from the motor con- receive an input signal from the motor con- receive an input signal from the motor con- receive an input signal from the motor con- receive an input signal from the motor con-
trol/tachometer circuit (JP4 connector), the trol/tachometer circuit (JP4 connector), the trol/tachometer circuit (JP4 connector), the trol/tachometer circuit (JP4 connector), the trol/tachometer circuit (JP4 connector), the
motor speed will rapidly accelerate for 5 sec- motor speed will rapidly accelerate for 5 sec- motor speed will rapidly accelerate for 5 sec- motor speed will rapidly accelerate for 5 sec- motor speed will rapidly accelerate for 5 sec-
onds then shut down. The machine control onds then shut down. The machine control onds then shut down. The machine control onds then shut down. The machine control onds then shut down. The machine control
will sense a "locked rotor" condition and the will sense a "locked rotor" condition and the will sense a "locked rotor" condition and the will sense a "locked rotor" condition and the will sense a "locked rotor" condition and the
motor will stop. If the motor control does motor will stop. If the motor control does motor will stop. If the motor control does
motor will stop. If the motor control does motor will stop. If the motor control does
not receive an input signal fr not r not r eceive an input signal fr eceive an input signal fr eceive an input signal from the motor
not r not r eceive an input signal fr
the motor will "jerk" for 5 seconds then shut the motor will "jerk" for 5 seconds then shut the motor will "jerk" for 5 seconds then shut
the motor will "jerk" for 5 seconds then shut the motor will "jerk" for 5 seconds then shut
down. down.
down. down. down.
1. Inspect the motor control wire harness for
integrity of the connections on both ends.
The harness is comprised of a White, Blue
and Black wire.
2. Set the washer into the Delay Wash cycle
and press the start/off button. The unit will
start without activating the motor. Leave
the tachometer harness on the motor con-
trol and insert the meter probes into the
back side of the tachommeter harness.
16008373-01
The following table indicates voltage checks
of the tachometer harness between the mo-
tor and motor control board.
Tachometer
Wire Checks
White to Black
(From Motor
Control)
White To Black
(From Motor
Control)
White To Black
(From Motor
Control)
Blue to Black
(From Drive
Motor)
Blue to Black
(From Drive
Motor)

UNBALANCE CONTROL SYSTEM

UNBALANCE CONTROL SYSTEM UNBALANCE CONTROL SYSTEM UNBALANCE CONTROL SYSTEM UNBALANCE CONTROL SYSTEM
om the motor, , , , , om the motor om the motor
om the motor
The unbalance control system is comprised
of the inertial switch, outer tub displacement
switch, strut displacement switch and a cabi-
net vibration sensor mounted to the machine
control board. The three switches are wired
in series on a 24 VDC circuit, monitored by
the machine control board. The sensor is
mounted on the machine control board.
Software in the machine control board will
begin monitoring the switches when the spin
speed reaches 90 rpm. The inertial unbalance
switch monitors outer tub vibrations above
150 rpm. Inside the door is a cabinet vibra-
tion absorber designed to counter the vibra-
tion of the tub and serve as a tuned absorber
for the whole washer.
SECTION 2. ELECTRICAL COMPONENTS & TESTING
© 1998 Maytag Corporation
Condition Of
Voltage Found
Component
11 VDC Good Motor
(± 2.5 VDC) Control Board
Bad Motor
0 VDC
Control Board
+ 13 VDC or
Bad Motor
<9 VDC
No change in
DC volts as
Bad Motor
motor is turned
slowly
Voltage
changes from 0
- 5 VDC volts as Good Motor
motor is turned
slowly.
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