Appendix B Accessories
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VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00
B-11
Use a motor with enhanced insulation.
Connect an output reactor (optional) to the output terminals of the AC motor drive
The length of the cable between AC motor drive and motor should be as short as possible
(10 to 20 m or less)
For models 7.5hp/5.5kW and above:
Insulation level of motor
1000V
1300V
1600V
460VAC input voltage
66 ft (20m)
328 ft (100m)
1312 ft (400m)
230VAC input voltage
1312 ft (400m)
1312 ft (400m)
1312 ft (400m)
For models 5hp/3.7kW and less:
Insulation level of motor
1000V
1300V
1600V
460VAC input voltage
66 ft (20m)
165 ft (50m)
165 ft (50m)
230VAC input voltage
328 ft (100m)
328 ft (100m)
328 ft (100m)
NOTE
When a thermal O/L relay protected by motor is used between AC motor drive and motor, it may
malfunction (especially for 460V series), even if the length of motor cable is only 165 ft (50m) or less.
To prevent it, please use AC reactor and/or lower the carrier frequency (Pr. 02-03 PWM carrier
frequency).
NOTE
Never connect phase lead capacitors or surge absorbers to the output terminals of the AC motor
drive.
If the length is too long, the stray capacitance between cables will increase and may cause
leakage current. It will activate the protection of over current, increase leakage current or not
insure the correction of current display. The worst case is that AC motor drive may be
damaged.
If more than one motor is connected to the AC motor drive, the total wiring length is the sum
of the wiring length from AC motor drive to each motor.
