Dexter Laundry T-350SWD Operators Manual Installation & Operation Instructions page 48

VFD Over-
DRIVE OV
voltage Fault
VFD Overheat
DRIVE OH
Fault
VFD Overload
DRIVE OL
Fault
8514-302-001 REV B page 48
Condition This error is over-voltage on the VF drive
Delay Delay time is 35 seconds.
Stop the machine and clear the cycle. Keep the door
Action locked until the machine has stopped moving and then
unlock the door.
Step 1: Measure the supply voltage to the VFD on L1.
The supply voltage should be from 187 to 264 VAC.
Also make sure the supply wires on L1 and N are
securely connected.
Step 2: Check the braking resistor connections at the
VFD. The terminal screws should be tight. One of the
braking resistor wires should be connected to terminal
Solution
B2.
Step 3: Measure each braking resistor separately to
make sure they are the correct resistance. (200 for 1,
2 and 3 Hp VFD and 160 for 5 and 5.5 Hp VFD).
Step 4: Connect a transient voltage surge suppressor
(with some form of filtering) at the voltage supply
panel or install a VFD filter.
Condition This error is over-heating on the VF drive
Delay Delay time is 12 seconds.
Stop the machine and clear the cycle. Keep the door
Action locked until the machine has stopped moving and then
unlock the door
Step 1: Make sure the cooling fins on the VFD heat
sink and the ventilation louvers on the rear channel
Solution are clean.
Step 2: Start a washer cycle and make sure the VFD
cooling fan operates after the cylinder starts turning.
Condition This error is overload on the VF drive
Delay Delay time is 12 seconds.
Stop the machine and clear the cycle. Keep the door
Action locked until the machine has stopped moving and then
unlock the door
(Check drive fault code before powering down). Check
the washer motor to ensure it turns freely. Check the
wiring for loose connections to the drive and motor.
Solution
Measure the braking resistor values. Check for
damaged motor wires. Check V-Belt tension and adjust
to 1" deflection at center. Check braking resistors.