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Installation
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CPS- MM-LC Reference Manual (Hardware)
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34
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Connecting example with inverter powered by three-phase
Wye (3-wire/4-wire, three-phase solidly-grounded neutral
system)
When connecting to the inverter output powered by three-phase Wye cable, isolation resistance of
three-phase induction motor that is connected to the inverter can be measured.
Connect phases (T1, T2, and T3) of inverter output, as well as the ground terminal with the voltage
input terminal (L1/T1, L2/T2, L3/T3, and REF) respectively. Then, put three cables of T1, T2, and T3
through the ZCT unit. AT this time, these cables should be connected to the three-phase induction
motor.
CAUTION
The motor should be operating at a constant speed while measuring.
Measuring may not start if the cable is unconnected.
If the connecting cable is affected by the noise, measuring may not be done accurately. Place
the connecting cable away from the noise source.
If the connecting cable is too long, measurement cannot be done accurately. Use the cable
shorter than 3.0 meters.
Ⅲ
Ⅱ
L1
L2
L3
ZCT Unit
Inverter
T1
T2
T3
3-phase induction
motor
(3-phase motor)
∼ ∼
∼
REF
