Whirlpool MAH3000 Tub Displacement Switch, Strut Displacement Switch, R P M, F U N C T I O N

Whenever a displacement switch is tripped, t h e m a c h i n e s t o p s a n d r e d i s t r i b u t e s t h e clothes load. This involves a three (3) second pause, followed by a five (5) second reverse tumble (47-49 rpm) to redistribute the clothes load. The washer will pause again for three

(3)seconds, then start the distribution profile again. To redistribute the load, the machine tumbles the load (50-90 rpm) and again at- tempts to pass through critical (about 150 rpm). The machine will try to redistribute

twice	as	the washer attempts to spin at	800
r p m .
Once	the	load is properly redistributed	and

the speed reaches above 500 rpm, the inertial switch and cabinet vibration sensor are used. If the inertial switch or sensor is activated, the washer will drop in spin speed. This is based upon the speed at which switch activation takes place. See Figure 2-12outlining the spin speed categories and the corresponding re- duced speeds. If the switches are not acti- vated, the final spin speed will reach a maxi- mum of 850 rpm and then drop to find the o p t i m u m p e r f o r m a n c e l e v e l , b a s e d u p o n readings taken by the cabinet vibration sen- sor. Consumers may be confused by the up- and-down cycling of the motor. However, the

machine is	searching for the optimal speed
p e r f o r m a n c e .
R P M	F U N C T I O N
4 7	T u m b l e
47-85	Distribution
90-250	Accelerate	Through
	Critical
250-499	Accelerate	Through
	Critical
500-575	High Speed	Acceleration

-WILL DROP TO 450 RPM

600-675 .................. High Speed Acceleration

-WILL DROP TO 555 RPM

> 6 7 5 ....................... High Speed Acceleration

- WILL DROP TO 650 RPM

750-800 ............. TOP SPIN SPEED

Figure 2-12

1 6 0 0 8 3 7 3 - 0 1

Tub Displacement Switch

The tub displacement switch is located on the upper right hand side of the outer tub, below the top concrete weight, between the outer tub and the cabinet. The switch senses the outer tub touching the cabinet side as the machine passes through critical. When this switch is tripped, the machine stops and re- distributes the load.

Testing the Tub Displacement Switch:

1 . Disconnect power to the unit.

2 . Place ohm meter leads across the two ter- minals of the switch. Depress the button on the switch. If the contacts open, the switch is good. If not, replace the switch.

Strut Displacement Switch

The strut displacement switch is clipped to the top of the left rear strut. The switch senses the outer tub bottoming out on the strut as the machine accelerates above 90 rpm. This is caused by the twisting motion of the outer tub. This additional switch is required because the twisting motion may not trip the outer tub displacement switch. The primary cause for activation would be an unbalance at the front and rear of the spinner on opposite sides.

The strut displacement switch is wired in se- ries with the tub displacement switch and causes the same type of redistribution.

Testing the Strut Displacement Switch:

1 . Disconnect power to the unit.

2 . Place ohm meter leads across the two ter- minals of the switch. Depress the button on the switch. If the contacts close, the switch is good. If not, replace the switch.

SECTION 2. ELECTRICAL COMPONENTS & TESTING 2 - 1 2

© 1998 Maytag Corporation