Vacon NXL 0023 5 - Cable Installation and the UL Standards

34(80) Cabling and connections vacon
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6
6.1.3 Cable installation and the UL standards
To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper cable with a
minimum heat-resistance of +60/75°C must be used.
The tightening torques of the terminals are given in Table 6-3.
Type Frame Tightening torque
[Nm]
Tightening torque
in-lbs.
NXL2 0002—0006 MF2 0.5—0.6 4—5
NXL5 0001—0005 MF3 0.5—0.6 4—5
NXL5 0007—0012 MF4 0.5—0.6 4—5
NXL5 0016—0032 MF5 1.2—1.5 10—13
Table 6-3. Tightening torques of terminals
6.1.4
Cable and motor insulation checks
1. Motor cable insulation checks
Disconnect the motor cable from terminals U, V and W of the frequency converter 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 protective ground conductor.
The insulation resistance must be >1MΩ.
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 protective ground conductor.
The insulation resistance must be >1MΩ.
3. Motor insulation checks
Disconnect the motor cable from the motor and open the bridging connections in the motor
connection box. Measure the insulation resistance of each motor winding. The measurement
voltage must equal at least the motor nominal voltage but not exceed 1000 V. The insulation
resistance must be >1MΩ.