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.

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