Operation

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.

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