Delta VFD-B Series User Manual

Appendix B Accessories|VFD-B-P Series
B-12 Revision April 2009, SW V1.00
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Use a motor with enhanced insulation.
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Connect an output reactor (optional) to the output terminals of the AC motor drive
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The length of the cable between AC motor drive and motor should be as short as possible
(10 to 20 m or less)
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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)
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.
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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.
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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.

Delta VFD-B Series Specifications

General

Series	VFD-B
Cooling Method	Fan cooling
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Control Mode	V/F control, Sensorless Vector Control
Communication	RS-485
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overload, Overtemperature, Short Circuit
Operating Temperature	-10°C to +50°C
Storage Temperature	-20°C to +60°C
Humidity	90% RH (non-condensing)
Altitude	1000m (Derating required above 1000m)