|
Symptom
|
Possible Cause or Solution
|
| Tripped Light
On |
Whenever the pump is off as
a result of Subtrol-Plus protective function, the red
tripped light is on. A steady light indicates the Subtrol-Plus
will automatically allow the pump to restart as described,
and a flashing light indicates repeated trips, requiring
manual reset before the pump can be restarted. Any other
red light operation indicates a faulty receiver. One-half
voltage on 460V will cause tripped light on. |
Control Circuit
Fuse Blows |
With power turned off, check
for a shorted contactor coil or a grounded control circuit
lead. The coil resistance should be at least 10 ohms and
the circuit resistance to panel frame over 1 megohm. A
standard or delay-type 2 amp fuse should be used. |
Contactor
Will
Not Close |
If proper voltage is at the
control coil terminals when controls are operated to turn
the pump on, but the contactor does not close, turn off
power and replace the coil. If there is no voltage at
the coil, trace the control circuit to determine if the
fault is in the Subtrol-Plus receiver, fuse, wiring, or
panel operating switches. This tracing can be done by
first connecting a voltmeter at the coil terminals, and
then moving the meter connections step by step along each
circuit to the power source, to determine at which component
the voltage is lost. With the Subtrol-Plus receiver powered
up, with all leads disconnected from the control terminals
and with an ohmmeter set at R X 10, measure the resistance
between the control terminals. It should measure 100 to
400 ohms. Depress and hold in the reset button. The resistance
between the control terminals should measure close to
infinity. |
Contactor
Hums
or Chatters |
Check that coil voltage is within
10% of rated voltage. If voltage is correct and matches
line voltage, turn off power and remove the contactor
magnetic assembly and check for wear, corrosion, and dirt.
If voltage is erratic or lower than line voltage trace
the control circuit for faults similar to the previous
item, but looking for a major drop in voltage rather than
its complete loss. |
Contactor
Opens
When Start Switch
is Released |
Check that the small interlocks
switch on the side of the contactor closes when the contactor
closes. If the switch or circuit is open, the contactor
will not stay closed when the selector switch is in HAND
position. |
Contactor
Closes But
Motor Doesn't Run |
Turn off power. Check the contactor
contacts for dirt, corrosion, and proper closing when
the contactor is closed by hand. |
Signal Circuit
Terminals Do Not
Energize |
With the Subtrol-Plus receiver
powered up and all leads disconnected from the Signal
terminals, with an ohmmeter set at R X 10, measure the
resistance between the Signal terminals. Resistance should
measure close to infinite. Depress and hold in the reset
button. The resistance between the signal terminals should
measure 100 to 400 ohms. |
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