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© 1998 Maytag Corporation
16008373-01 SECTION 1. GENERAL INFORMATION
1-7
When the washer is at the "full" level and the
timer is set in a Prewash Tumble, Main Wash
Tumble, Light Wash Tumble, or Rinse Tumble
increment, the machine control will begin the
sequence timing defined for each cycle and
fabric selection setting (See Cycle Sequence
Definitions).
During the drain and spin increments after the
main wash, first rinse, second rinse, and ex-
tra rinse increments, the wash side circuit in
the pressure switch is closed. When the wa-
ter level drains below the wash full level, the
circuit will close and energize the pressure
switch input. The machine control interprets
this signal (not to energize the water valve
outputs) to measure how quickly the washer
is draining. If the machine control commands
a spin speed above 51 rpm before the pres-
sure switch input is energized, it will drop the
speed to 0 rpm and hold there until the pres-
sure switch input is energized. An additional
delay equal to the length of time elapsed will
occur before the pressure switch input is en-
ergized. If four minutes elapse without the
pressure switch input being energized, the
machine control will energize the timer mo-
tor output to advance the timer into the next
increment and continue with the cycle.
START/STOP INPUT
The start/stop input is energized by the mo-
mentary Push-to-Start/Stop Switch. If this in-
put is energized when a cycle is in progress,
the machine control will disengage the line
relay, both water valve output signals, the door
lock wax motor signal, the timer motor out-
put signal, and the on-light output signal. If
this input is energized when a cycle is not in
progress, the machine control will energize
the line relay and begin the cycle sequence as
defined by the timer and user input switches
(See Push-To-Start/Line Relay Operation).
TACH INPUT
The tach input is a feedback signal from the
motor control. It provides eight pulses per
revolution of the switched reluctance motor.
The motor runs at 14 times the speed of the
spinner (14:1 belt ratio). The tach input is used
for monitoring speed and out-of-balance de-
tection (See Tachometer Circuit Diagnostics).
If the machine control commands a motor
speed and direction but does not sense a tach
input signal within five seconds, it will disen-
gage the line relay to stop the washer. This
generally indicates a locked rotor or a mal-
function in the motor control.
If the machine control senses a tach input sig-
nal when it is not commanding the motor to
run, it will disengage the line relay to stop the
washer.
If the machine control commands a coast
down from final spin speed but is still receiv-
ing a tach input signal after two minutes, it
will disengage the line relay to stop the washer.
TEMPERATURE SENSOR INPUT
A thermistor is located in the water valve to
monitor the blended incoming water tempera-
ture. The machine control uses this input sig-
nal to regulate the water temperature with the
warm or cold wash or warm rinse tempera-
ture selections (See Water Valve Outputs).
TIMER INPUTS
The Timer Input signals are energized through
the cams in the timer. The timer operates with
a 30 second drive cycle and a 5.8 second ad-
vance time (See Timer Input Charts).
WATER TEMPERATURE INPUTS
The Water Temperature inputs are two sepa-
rate signals defined by a user input switch on
the control panel. The machine control inter-
prets these signals to determine what the wa-
ter temperature should be for each fill (See
Water Valve Outputs).
machine control interprets this loss of power
as an indication that the water level has
reached the full level.