TREND NX Variable Speed Drives - Manual (Page 76)

CABLING AND CONNECTIONS vacon • 59
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6
6.1.6 Cable selection and unit installation in accordance with the UL standards
To meet the UL ( Underwriters Laboratories ) regulations, use a UL-approved copper cable with a minimum
heat-resistance of +60/75
°
C. Use Class 1 wire only.
The units are suitable for use on a circuit capable of delivering not more than 100,000 rms symmetrical
amperes, 600V maximum.
The tightening torques of the terminals are given in Table 6-7.
* Tightening torque of terminal connection to
the isolative base in Nm/in-lbs.
** Apply counter torque to the nut on the other
side of the terminal when tightening/loosening
the terminal screw in order to avoid damage to
the terminal.
Table 6-7. Tightening torques of terminals
6.1.7 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.
Type Frame Tightening torque
[Nm]
NX_2 0004—0012
NX_5 0003—0012
FR4 0.5—0.6
NX_2 0017—0031
NX_5 0016—0031
FR5 1.2—1.5
NX_2 0048—0061
NX_5 0038—0061
NX_6 0004—0034
FR6 10
NX_2 0075—0114
NX_5 0072—0105
NX_6 0041—0080
FR7 10
NX_2 0140
NX_5 0140
FR8 20/9*
NX_2 0168—0205
NX_5 0168—0205
FR8 40/22*
NX_2 0261—0300
NX_5 0261—0300
NX_6 0125—0208
FR9 40/22*
NX_5 0385—1030 FR10…12 40*
NX_6 0261—820 FR10…12 40*