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Installation
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CPS- MM-LC Reference Manual (Hardware)
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33
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2.
Inverter output part measurement (inverter
mode)
By measuring the voltage and the zero-phase current of the output part in the inverter, the isolation
resistance of the connected three-phase induction motor can be measured.
Voltage measurement cable
Use the voltage measurement cable described below.
Wire
Use copper wires that tolerate the temperature of 75 °C and higher.
Cable Diameter
AWG24 - 12
Cable Length
Shorter than 3.0 meters
*Refer to
"Voltage Measurement Connector"
in the
page 19
for details of the voltage input
connector and pin assignment.
Connecting example with inverter powered by three-phase
Delta (3-wire, three-phase corner-grounded system)
When connecting to the inverter output powered by three-phase Delta 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.
Ⅲ
Ⅱ
∼ ∼
∼
L3
L1
L2
ZCT Unit
Inverter
T3
T1
T2
3-phase induction
motor
(3-phase motor)
REF
