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Gorman-Rupp Pumps SF4A-X 1531245 and up User Manual

Page 23

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SF SERIES X‐PROOF PUMPS

OM-06629

TROUBLESHOOTING

PAGE D - 4

Insulation Resistance

Set the megohmmeter at R x 100, and zero‐ba­
lance it. Test as follows:

a. Shut off incoming power to the control box,

and disconnect the motor power cable leads.
Connect one megohmmeter test lead to the
motor cable green/yellow ground lead. Touch
the other test lead to each of the motor cable

leads in turn. Note the readings.

b. Readings will indicate resistance values in

both the power cable and motor windings.If
resistance reads infinity (

1), insulation is

good. If resistance reads between infinity (

1),

and 1 megohm, insulation is acceptable but
should be rechecked regularly. If resistance
reads less than 1 megohm, insulation should
be checked more closely and frequently.

c. If readings indicate that a ground exists, the

motor must be returned to the factory or to a
Gorman‐Rupp authorized repair facility.