Delta Variable Frequency Drive; Delta Vfd Motor Leads; Delta Vfd Dynamic Braking Resistors; Delta Vfd Cooling Fan - Dexter Laundry T-350 Parts & Service Manual

Delta Variable Frequency 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 200 Ohm braking resistors 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.
116
Part # 8533-104-001 1/18