A-22
Choose suitable motor cable and precautions
Improper installation and choice of motor cable will affect the performance of EMI filter. Be sure to observe the
following precautions when selecting motor cable.
1. Use the cable with shielding (double shielding is the best).
2. The shielding on both ends of the motor cable should be grounded with the minimum length and maximum
contact area.
3. Remove any paint on metal saddle for good ground contact with the plate and shielding.
Remove any paint on metal saddle for good ground contact with
the plate and shielding.
saddle
the plate with grounding
Figure 1
Saddle on both ends
Saddle on one end
Figure 2
The length of motor cable
When motor is driven by an Hybrid drive of PWM type, the motor terminals will experience surge voltages easily due
to components conversion of Hybrid drive and cable capacitance. When the motor cable is very long (especially for
the 460V series), surge voltages may reduce insulation quality. To prevent this situation, please follow the rules
below:
Use a motor with enhanced insulation.
Connect an output reactor (optional) to the output terminals of the Hybrid drive
The length of the cable between Hybrid drive and motor should be as short as possible (10 to 20 m or less)
For models 7.5hp and above:
Insulation level of motor 1000V 1300V 1600V
460VAC input voltage 66 ft (20m) 328 ft (100m) 1312 ft (400m)
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