Control Mounting Trough; Main Data Communication Cable; Circuit Breaker/Fuse; Main Control Printed Circuit Board - Dexter Laundry O Series Parts And Service Manual

Control Mounting Trough

Remove top panel to access control trough. (see Removing Top Panel) It sets on the right side of the
machine and holds the control PCB's, transformers,and pressure switch.

Main Data Communication Cable

Goes between front PCB board and Variable Frequency Drive unit mounted center rear of machine. It
has telephone type connectors at each end and is inserted at Controller PCB and the Variable Frequency
Drive.

Circuit Breaker/Fuse

The fuse (optional circuit breaker) mounts to the rear channel. It carries
all of the controls in the machine but does not include the motor. To
reset the circuit breaker just push in the button. If you have a fuse then
remove fuseholder and fuse and replace with a 1 1/2 amp fast blow type
fuse.

Main Control Printed Circuit Board

Please be sure to be grounded to machine before removal of this board from machine. PC board mounted
vertically behind front control panel. Remove hold down nuts in 4 corners and 1 at bottom center.
PCB Transformer Step-down
Small transformer mounted at front of control trough that is powered with 120 VAC primary and two
secondary outputs of 2.3 VAC and 24-27 VAC.

Controls Transformer

This transformer is mounted at the back of the control trough and steps a range of 208 to 240 volts down
to 120 volts for the controls. There are two terminals on the controls transformer for incoming power.
One terminal tap is marked for 208 volts use this tap for measured voltage of 200 volts - 215 volts. and
the other tap is marked 230 volts for 216 volts - 240 volts. Note: All washers have a controls transformer.
Always check the incoming voltage and use the appropriate transformer terminal when installing ALL
washers.

Main Relay Printed Circuit Board

Please be sure to be grounded to machine before removal of this board. PCB mounting horizontal in
control trough towards front of machine. Remove 4 mounting nuts.
LED Printed Circuit Board Temperature & Start Display/Push-Button
The selector switch is mounted in the center of the control panel and is held in place with five nuts. It
allows the selection of hot, warm or cold water temperatures. Note: Do not over tighten on reinstallation
as the switch can be damaged, stay pushed in and will cause erratic displays.

Pressure Switch

The pressure switch sets the water level in the washer. As the water level rises, it compresses the air in
the pressure switch hose. When the washer reaches the desired water level, the compressed air in the
pressure switch hose opens the contacts in the switch, shutting off the water. When at the empty level,
the pressure switch contacts are closed allowing the machine to either spin or fill with water.
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Fuse Location

Power Connection Terminal Block

This terminal block sets at the very back of the control trough. Incoming power to the washer should
connect here. (see Electrical under Installation and Operation Section for exact connections)
Rear
Delta Variable Frequence Drive:
Main power is connected to terminals L1, L2, and L3 on the Delta drive. If the washer is connected to a
three phase source, there should be voltage present on all three terminals. If the washer is connected to
single phase power, there should be voltage present on terminals.
The voltage should measure 208 Volts to 240 Volts A.C. between phases and connected to if connected
to three phase). There is a tolerance of + 10% on the mains voltage (187 Volts to 264 Volts).

Delta VFD Motor Leads:

The wires from the motor are connected to terminals T1, T2, and T3. Since this drive uses pulse width
modulation, an accurate current or voltage reading is not possible. Although an accurate current reading
is not possible, a balanced current reading should be present while the motor is running.

Delta VFD Dynamic Braking Resistors:

Two, 160 Ohm or 200 Ohm braking resistors (Please check your washer model parts requirements and
quantities), are connected in parallel and attached to the drive at terminals B1 and B2. These resistors
allow voltage, which is generated by the motor when decelerating, to be dissipated. They will become hot
while the motor is slowing down, so care should be taken so as not to come in contact with them. This
will prevent an electrical shock and/or a physical burn.

Delta VFD Cooling Fan:

There is a cooling fan attached to the bottom of the Delta drive. This fan will operate when the internal
temperature of the drive reaches a predetermined level, the same way the radiator fan in a newer car
operates. THE FAN CAN OPERATE ANYTIME POWER IS APPLIED TO THE DRIVE! Remove power to the
drive if work is required around the fan.
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