Subtrol-Plus - Troubleshooting After Installation
| Symptom |
Possible Cause or Solution |
| Subtrol-Plus
Dead |
When the Subtrol-Plus reset
button is depressed and released, all indicator lights
should flash. If line voltage is correct at the Subtrol-Plus
and the L1, L2, L3 terminals, and the reset button does
not cause lights to flash, Subtrol-Plus receiver is malfunctioning. |
| Green Off
Time Light Flashes |
The green light will flash and
not allow operation unless both sensor coils are plugged
into the receiver. If both are properly connected and
it still flashes, the sensor coil or the receiver is faulty.
An ohmmeter check between the two center terminals of
each sensor coil connected should read less than 1 ohm,
or coil is faulty. If both coils check good, receiver
is faulty. |
| Green Off
Time Light On |
The green light is on and the
Subtrol-Plus requires the specified off time before the
pump can be restarted after having been turned off. If
the green light is on except as described, the receiver
is faulty. Note that a power interruption when the motor
is running will initiate the delay function. |
| Overheat
Light On |
This is a normal protective
function which turns off the pump when the motor reaches
maximum safe temperatures. Check that amps are within
the nameplate maximum on all three lines, and that the
motor has proper water flow past it. If overheat trip
occurs without apparent motor overheating, it may be the
result of an arcing connection somewhere in the circuit
or extreme noise interference on the power lines. Check
with the power company or Franklin Electric. A true motor
overheat trip will require at least five minutes for a
motor started cold. If trips do not conform to this characteristic,
suspect arcing connections, power line noise, ground fault,
or SCR variable speed control equipment. |
| Overload
Light On |
This is a normal protective
function, protecting against an overload or locked pump.
Check the amps in all lines through a complete pumping
cycle, and monitor whether low or unbalanced voltage may
be causing high amps at particular times. If overload
trip occurs without high amps, it may be caused by a faulty
rating insert, receiver, or sensor coil. Recheck that
the insert rating matches the motor. If it is correct,
carefully remove it from the receiver by alternately lifting
sides with a knife blade or thin screwdriver, and make
sure it has no pins bent over. If the insert is correct
and its pins are okay, replace receiver and/or sensor
coils. |
| Underload
Light On |
This is a normal protective
function.
- Make sure the rating insert is correct for the
motor.
- Adjusting the underload setting as described to
allow the desired range of operating conditions. Note
that a DECREASE in underload setting is required to
allow loading without trip.
- Check for drop in amps and delivery just before
trip, indicating pump breaking suction, and for unbalanced
line current.
- With the power turned off, recheck motor lead resistance
to ground. A grounded lead can cause underload trip.
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