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Fault Interlock
Contact
A set of contacts is connected to a receptacle on the control panel. The con-
tacts are rated 10A/240V. This is not a power inlet or outlet. The receptacle is
isolated from the circuitry. Its ground pin is connected to the chassis. The
contacts are closed during normal operation and open when the unit is turned
off or when a fault is detected.
Fuses
Three-phase units have fuses. Refer to the serial number label on the rear of
the unit for the specific electrical requirements of your unit.
Remove the top cover, the right access panel and the control box cover. The
fuses are located inside the control box.
Phase Rotation
Three phase units with three phase pump motors are equipped with a phase
rotation interlock. If the phasing is wrong, the controller will display PHEr and
the unit will not start.
Unplug the unit. Reverse any two power cord wires in the power cord plug.
Never remove the green ground wire.
Plug in the unit. The PHEr display should be off and the unit should start.
Pump Motor
Overload Protector
Three phase units with three phase pump motors have a pump motor
overload protector.
The overload protector prevents the pump motor from exposure to excessively
high current. If an overload fault occurs, due, for example, to a heavy work load,
the controller will display OL and the unit will shut down. The overload protector
will automatically reset after about two minutes. The unit must be manually
restarted.
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