Inertial Unbalance Switch; Cabinet Vibration Sensor; Cabinet Vibration Absorber - Maytag Neptune MAH3000 Service Manual

Inertial Unbalance Switch

The inertial unbalance switch is located on the
upper right hand side of the outer tub, in front
of the top concrete weight.
sists of a moving weight in the switch body
which presses against the switch contacts.
the unbalance of the outer tub becomes too
erratic, the moving weight will open the con-
tacts in the switch.
troller senses the switch opening, the machine
controller will reduce the spin speed to 650,
550, or 450 rpm depending on the current
speed closest to the level spin speed (i.e. 625
rpm trip would drop to 550 rpm) (See Figure
2-12).
Testing the Inertial Unbalance Switch:
Testing of the switch may prove difficult. The
switch will not open unless the switch is
moved side to side creating a "G" force of 8 - 9
Ft. lbs.
1 . Disconnect power to the unit.
2 . Place ohm meter leads across the two ter-
minals of the inertial switch.
switch side to side.
open easily, the switch is good.
switch contacts are open or easily tripped,
replace the switch.

Cabinet Vibration Sensor

The cabinet vibration sensor is mounted to the
lower left corner of the machine control
board. This is a piezo-electric strip mounted
to the machine control board.
attached to the end of the strip, the machine
controller monitors the cabinet vibration as
the machine reaches top speed.
controller uses the vibration sensor to attempt
to spin the washer at the optimum speed with
the least amount of vibration.
changes from machine to machine due to:
changes in mass of the absorber; changes in
1 6 0 0 8 3 7 3 - 0 1
The switch con-
When the machine con-
Move the
If the contacts do not
If the
With a mass
The machine
Optimum speed
© 1998 Maytag Corporation
spring rate of the absorber; and changes in
the pulley-belt ratio.
run to run due to the size of the clothes load
and type of floor.
mum speed on every run.
is between 750 and 850 rpm.
If

Cabinet Vibration Absorber

This is a tuned absorber mounted in the door.
The tuned absorber consists of a mass sus-
pended by springs tuned to vibrate at approxi-
mately 800 rpm.
grees out of phase with the vibration of the
cabinet. This cancels out much of the vibra-
tion caused by the clothes load at 800 rpm (See
Section 5: Cabinet Assembly).
SECTION 2. ELECTRICAL COMPONENTS & TESTING
It can also change from
The sensor finds the opti-
The optimum speed
The mass vibrates 180 de-
2 - 1 3