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INSTRUCTION MANUAL
3.6.2
Insulation Resistance Measurement
WARNING : ALL ELECTRIC WORK SHOULD BE PERFORMED BY A
!
QUALIFIED ELECTRICIAN AND ALL NATIONAL AND LOCAL ELECTRICAL
CODES MUST BE OBSERVED.
Although insulation resistance of this pump has been shop tested, it should be
rechecked prior to installation, using the following procedure. Usually, insulation
resistance of a minimum of 50MΩ is considered satisfactory (when measured with a
DC 500V Megger).
Measurement procedure (Refer to Figs. 10 and 11)
Connect the minus (-) terminal to G of the DC 500V Megger to the G terminal of the
power cable, or a motor bolt.
In dual power cable, connect the L4-, L5- and L6- phases electrically and keep them
off the ground.
Touch the plus (+) terminal of the Megger to L1-phase (or L2-phase or L3-phase) of
the power cable, and read the insulation resistance.
Touch the plus (+) terminal of the Megger to P1 (or P2) and P3 (or P4) of the
protective device cable, with the minus (-) terminal G connected as above, and read
the insulation resistance.
CAUTION : DO NOT CONNECT THE TWO MEGGER TERMINALS BETWEEN
!
P1 AND P2 OR P3 AND P4, TO AVOID DAMAGE TO THE PROTECTIVE DEVICE.
KEEP THE CABLES OFF THE GROUND WHILE TAKING ALL MEASUREMENTS.
PM32U
Fig. 10
P.11
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