Whirlpool MAH3000 MISCELLANEOUS Door Latch Switch Monitoring, Door Lock/Spin Control, 1-11

In a Prewash Tumble increment, the machine control will de-energize the line relay if the washer continues to tumble for 15 minutes. This would only occur if the timer were to stall

(See Section 1: Timer Motor Output and Sec-

tion 2: Timer Input Chart).

MISCELLANEOUS

Door Latch Switch Monitoring

At the end of a cycle, when the timer advances into the Idle increment, the machine control will keep the line relay energized until it loses power when the door latch switch opens. This guards against the switch contacts welding closed. In this condition, the machine con- trol will limit what additional cycles can be run before the door is opened as follows:

Washers between Series 10 and 16

The machine control will allow the washer to restart only if the user sets the timer into a Rinse Tumble or Spin3 increment.

Washers from Series 17 and Later

The machine control will allow the washer to restart in any setting. After that cycle completes, the user must open the door before the machine control will allow a third cycle to start.

Door Lock/Spin Control

When the machine control begins a spin in- crement, it will not command spin speed above 51 rpm unless the door lock switch in- put is energized. At the start of a spin incre- ment, the machine control will drop the speed to 0 rpm then tumble until the switch is ener- gized. At that point, it will restart the spin se- quence. If the door lock switch is not ener- gized after 2 minutes of tumbling, the machine

control will energize the timer motor output until the timer inputs change so the washer can proceed with the cycle.

At the end of spin sequence, if the door lock switch input is de-energized before the washer drops below 91 rpm, a hardware circuit on the machine control will interrupt the torque out- put signal, which forces the motor control to 0 rpm, and energize the door lock wax motor circuit to lock the door. This hardware circuit will keep the door lock wax motor circuit en- ergized until the door lock switch input signal is energized.

Redistribution

The machine control commands a distribu- tion profile speed ramp from 0 rpm to 85 rpm at the beginning of each high speed (above 100 rpm) spin. When the washer reaches 85 rpm, the machine control monitors the Tach Input to determine if the speed varies through one revolution of the spinner basket. If it senses a high enough variation in speed (sug- gesting an out-of-balance condition in the clothing load), it will drop the spinner speed to 0 rpm and force a short reverse tumble to redistribute the clothing load before resum- ing the spin. If any of the out-of-balance switches trip and open the out-of-balance in- put circuit at a speed below 500 rpm, the ma- chine control will also drop the speed to 0 rpm and force the reverse tumble to redistribute the clothing load.

16008373-01	SECTION 1. GENERAL INFORMATION	1-11
	© 1998 Maytag Corporation