Contec CONPROSYS CPS-MM-LC, Reference Manual

Page: 30 / 47

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Installation
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CPS- MM-LC Reference Manual (Hardware)
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3. Cable Connection
1. Measure all the equipment (power mode)
By measuring the voltage of the power and the zero-phase current in the control panel, the isolation
resistance of all the equipment including the connecting inverters 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
measurement connector and pin assignment.

Connecting example with three-phase Delta (3-wire, three-
phase corner-grounded system)
When connecting to the power of three-phase Delta cable, isolation resistance of all equipment
including inverters can be measured.
Connect phases (L1/T1, L2/T2, L3/T3, and L3), as well as the ground terminal with the voltage input
terminal (L1, L2, L3, and REF) respectively. Then, put three cables of L1, L2, and L3 through the ZCT
unit. At this time, these cables should be connected to the equipment or inverters.
Ⅲ
Ⅱ
Equipment/Inverter
∼ ∼
∼
L3
L1
L2
ZCT Unit
REF