Maytag 16010061 UNBALANCE CONTROL SYSTEMUNBALANCE CONTROL SYSTEM, UNBALANCE CONTROL SYSTEMUNBALANCE CONTROL SYSTEM UNBALANCE CONTROL SYSTEM

2-112-11

2-11

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

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.

Note:Note:

Note:

If the machine control board does not 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-

trol/tachometer circuit (JP4 connector), thetrol/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-

onds then shut down. The machine controlonds then shut down. The machine control

onds then shut down. The machine control

will sense a "locked rotor" condition and thewill sense a "locked rotor" condition and the

will sense a "locked rotor" condition and the

motor will stop. If the motor control doesmotor will stop. If the motor control does

motor will stop. If the motor control does

not rnot r

not r eceive an input signal freceive an input signal fr

eceive an input signal freceive an input signal fr

eceive an input signal fr om the motorom the motor

om the motorom the motor

om the motor,,

the motor will "jerk" for 5 seconds then shutthe motor will "jerk" for 5 seconds then shut

the motor will "jerk" for 5 seconds then shut

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.

Figure 2-11Figure 2-11

Figure 2-11

Tachometer

Wire Checks Voltage Found Condition Of

Component

White to Black

(From Motor

Control)

11 VDC

(± 2.5 VDC)

Good Motor

Control Board

White To Black

(From Motor

Control)

0 VDC Bad Motor

Control Board

White To Black

(From Motor

Control)

+ 13 VDC or

<9 VDC Bad Motor

Blue to Black

(From Drive

Motor)

No change in

DC volts as

motor is turned

slowly

Bad Motor

Blue to Black

(From Drive

Motor)

Voltage

changes from 0

- 5 VDC volts as

motor is turned

slowly.

Good Motor

UNBALANCE CONTROL SYSTEMUNBALANCE CONTROL SYSTEM

UNBALANCE CONTROL SYSTEM

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 .

The following table indicates voltage checks

of the tachometer harness between the mo-

tor and motor control board.