Motor - Pentair FAIRBANKS NIJHUIS 1900 Series Instruction And Repair Manual

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MOTOR:

The trouble or symptoms, their probable causes and the suggested remedies contained in this troubleshooting
guide will assist you in quickly determining and correcting most problems should they occur. It is not the intention
of Fairbanks Nijhuis™ to replace the recommendations of the motor manufacturer in regard to operation and
maintenance. Rather, this guide is offered as a supplement to such data. Any specific questions or problems should
be directed to the manufacturer of the motor. Be sure to supply the relevant data from the motor nameplate when
inquiring about motor service or maintenance.
Electrical troubleshooting should be performed by qualified electricians skilled in the use of electrical
instruments.
Electrical power should be disconnected and locked to prevent the motor from accidentally starting during mechanical
systems check.
TROUBLE
1. Motor does not start.
DANGER:
PROBABLE CAUSE
a. Break in power supply circuit.
1. Blown or defective primary
fuses or open circuit breakers.
2. Blown or defective secondary
fuses or opened circuit
breakers.
b. Open control circuit.
1. Overload trips are open.
2. Defective holding coil in
magnetic switch.
3. Loose or poor connections in
control circuit.
c. Magnetic switch closes.
1. Poor switch contact.
2. Open circuit in control panel.
3. Open circuits in leads to motor.
4. Leads improperly connected.
1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
REMEDY
a. Close break in circuit.
1. Check voltage across all
phases above the disconnect
switch. Replace fuses or reset
circuit breakers as necessary.
2. Check voltage across all
phases below disconnect
switch (with disconnect switch
closed). Replace fuses or reset
circuit breakers as necessary.
b. Complete control circuit.
1. Push reset button.
2. Push start button and allow
sufficient time for operation
of time delay, if used, then
check voltage across magnetic
holding coil. If voltage is
measured, coil is defective. If
no voltage is measured, control
circuit is open.
3. Make visual inspection of all
connections and retighten as
necessary.
c. Check switch operation.
1. Open manual disconnect
switch, close magnetic
switch by hand and examine
contactors and springs.
2. Check voltage at TI-TI-T3.
3. Check voltage at leads to outlet
box.
4. Check lead numbers and
connections.
04/30/14