Owner's Manual
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Chapter D - WIRING AND SIZING INFORMATION
Cable installation and the UL standards
To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper cable with
a minimum heat-resistance of +60-75C must be used.
The tightening torques of the terminals are given in table below.
Tightening torques of terminals
* Tightening torque of terminal connection to the isolative base in Nm/in-lbs.
XT inverter type
Frame
Tightening torque[Nm]
Tightening torque in-lbs.
4004~4012 1 0.5—0.6 4—5
4016~4022 2 1.2—1.5 10—13
4031~4045 3 4 35
4061~4087 4 10 85
4105~4140 5 20 170
4168 5 40 340
4210 6 50 425
Cable and motor insulation checks
1. Motor cable insulation checks
Disconnect the motor cable from terminals U, V and W of the inverter and from the
motor. Measure the insulation resistance of the motor cable between each phase
conductor as well as between each phase conductor and the ground. The insulation
resistance must be >1M ohm.
2. Mains cable insulation checks
Disconnect the mains cable from terminals L1, L2 and L3 of the frequency converter
and from the mains. Measure the insulation resistance of the mains cable between
each phase conductor as well as between each phase conductor and the ground. The
insulation resistance must be >1M ohm.
3. Motor insulation checks
Disconnect the motor cable from the motor in the motor connection box. Measure the
insulation resistance of each motor winding and ground. The measurement voltage
must equal to at least the motor nominal voltage but not exceed 1000 V. The insulation
resistance must be >1M ohm.
D-1
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