Xylem GSSERVICE R2 Service Manual Submersible Pumps & Jet Pumps - Manual (Page 14)

12
MEASURING INSULA
TION RESIS
TANCE
This instrument is used to measure insulation
resistance to ground. It consists of a crank-
turned magneto, on the side of the case, and
will give very close readings calibrated di-
rectly in ohms. It is cranked at a moderate rate
of speed, approximately 120 rpm, until the
pointer reaches a steady deflection.
1. If the ohm value is normal, the motor
windings are not grounded and the cable
insulation is not damaged.
2. If the ohm value is below normal, either the
windings are grounded or the cable insula-
tion is damaged. Check the cable at the well
seal as the insulation is sometimes damaged
by being pinched.
Megger