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F232123
18
Balance Detection
Each machine is equipped with either an AC inverter
drive balance detection system or an overtravel limit
switch balance detection system. To determine which
system the machine is equipped with, consult the
wiring diagram sent with the machine.
Overtravel Limit Switch Balance Detection
This system uses the overtravel limit switch only; the
AC drive balance detection system is not utilized. As
the cylinder is spinning at the programmed speed, if
the wash load becomes unbalanced, the overtravel
limit switch is “tripped” causing the cylinder to slow
to a stop until the end of the spin step.
AC Inverter Drive Balance Detection
Load balance is monitored by the AC inverter drive
during any drain step that immediately precedes a spin
step.
If a spin step follows a drain step, the cylinder
accelerates to distribution speed seven seconds into the
drain step.
The computer begins monitoring the balance signal
from the AC inverter drive eight seconds after the
water level drops below low level. If the balance signal
indicates that the wash load is evenly distributed, the
computer will start the spin step.
If the balance signal indicates that the wash load is
unbalanced, the computer will slow the cylinder down
to wash speed for seven seconds in an attempt to
redistribute the load. The computer will make as many
as seven attempts if needed.
If on the seventh attempt the load is not balanced, the
machine will light the out-of-balance LED indicator
located in the upper left corner of the display (to the
left of the first digit) until the drain step is complete.
The machine will then continue the spin speed at a
safe level.
If this occurs in the final segment, the machine will
skip the spin step and initiate the stop routine. The out-
of-balance LED indicator will remain lit until the door
is opened.
As a fail-safe measure, an overtravel limit switch will
“trip” during a spin if the wash load becomes severely
unbalanced, slowing the cylinder to a stop until the end
of the spin step.
Motor Thermal Overload Indicator
If the machine is equipped with a small indicator lamp
on the side of the control module, it will light to
indicate that a thermal overload switch in the motor
has shut off the AC power to the computer board,
thereby preventing damage to the motor caused by
overheating and/or an overload condition. This feature
protects and extends the life of the motor.
The thermal overload switch will automatically reset
itself after the excessive heat condition has subsided.
Before attempting to restart the washer-extractor,
determine the reason for the overload. The following is
a partial list of possible problems:
● Washer-extractor not fully drained before spin
● Out-of-balance condition
● Low voltage
● Loss of one phase on a three-phase motor
● Bad bearings
● Air circulation blocked to motor
Contact a service technician to correct serious
problems. Failure to take corrective action will
ultimately result in damage to the motor and/or the
inverter drive.