Cable Installation And The Ul Standards; Cable And Motor Insulation Checks - Honeywell NXL User Manual

42(96)

6.1.4 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
The tightening torques of the terminals are given in Table 6-6.
Frame Tightening torque
MF2
MF3
MF4
MF5
MF6
Table 6-6. Tightening torques of terminals

6.1.5 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.
6
Cabling and connections
C must be used.
°
[Nm]
0.5—0.6
0.5—0.6
0.5—0.6
1.2—1.5
4
Tightening torque
in-lbs.
4—5
4—5
4—5
10—13
35
Honeywell Honeywell
Honeywell Honeywell