Submersible Controls Troubleshooting - Pentair Pentek Series Electronic Manual

SECTION 13: Troubleshooting
13.5 Submersible Controls
Troubleshooting
Individual Component Diagnostics
Potential Relays
Using ohm meter - Coil Resistance (2 to 5) should
measure according to the specification printed on the
wiring diagram.
Using ohm meter - Contact resistance (1 to 2)
should measure close to zero; higher values indicate
deterioration of the contacts.
When the SMC first starts a faint click should be heard
very shortly after the pump activates
Start Capacitor
Using a capacitor meter – measured capacitance should
be within +20% of the rating printed on the capacitor (or
consult parts list for ratings).
Using ohm meter – the meter should quickly show
low resistance (ohms) and move slowly to show higher
resistance. Resistance should not be zero or open.
Physical Inspection – A foul smell or a buildup of black
soot indicates that a start capacitor has vented usually
because of heat or prolonged use.
Run Capacitor
Using a capacitor meter – measured capacitance should
be within +/- 6% of the rating printed on the capacitor (or
consult parts list for ratings).
Using ohm meter – the meter should quickly show
low resistance (ohms) and move slowly to show higher
resistance. Resistance should not be zero or open.
Physical Inspection – Run capacitors have a built in
fail safe device that disconnects the capacitor in case
of overheat, in the case of such an event the capacitor
will bulge.
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Overloads
Push overload to ensure that it is reset.
Using ohm meter – connection resistance should
measure close to zero.
Magnetic Contactor
Using ohm meter – Coil Resistance should measure per
specification on wiring diagram.
Using ohm meter – Resistance between T1 & L1 and T2 &
L2 should measure close to zero with contacts manually
closed. Greater values indicates degradation of contacts.
Physical Inspection – Contacts should be free to move up
and down.
Measurements while running
Small Box – Measurements cannot be taken while
running, line voltage can be monitored with the cover off,
by placing a voltmeter across L1 & L2. Winding resistance
can be taken while motor is connected and should
correspond to manufacturers specification.
Fatal electrical shock hazard. Only qualified
persons should perform the following procedure.
Medium and Large Box - To take measurements while
running, remove the cover. Turn on the pump and allow
to cycle as usual. L1 to L2 should measure 230V +/- 10%,
it should not dip during operation. A clamp-on ammeter
can be used to measure amp draw along any number
of circuits.
The larger yellow wire or main leads can be used to
measure amp draw of the system, draw should spike and
then come in less than 1 second. Orange lead amp draw
should start out high and then drop out to become zero. If
the reading stays high there is a relay problem.
The voltage between Red and Yellow should measure
approximately 330V - higher values indicate no load;
lower values indicate the motor (CSCR or PSC only) is
not up to speed. Note that winding resistance cannot be
measured while the motor is attached to the control box.