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Operation
F232183
16
Balance Detection
Each machine is equipped with an AC inverter drive
balance detection system and a vibration safety switch.
Load balance is monitored by the AC inverter drive
during any drain step that immediately precedes a spin
step in a regular cycle.
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 soon 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 turn off the motor for
about four seconds, then will operate the cylinder
down to wash speed for seven seconds in an attempt to
redistribute the load. The computer will make as many
as three attempts if needed.
If on the third 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 and following spin
conclude. The computer will limit the spin speed to a
safe level.
As a fail-safe measure, a vibration safety switch will
“trip” during a spin if the wash load becomes severely
unbalanced, slowing the cylinder to a stop and
aborting the remaining portion of the cycle. The
computer display will alternately flash “BAL” “door”
until the door is opened.
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.