Delta C2000 Series User Manual page 92

690V DC Choke
KW
VFD185C63B-21
VFD220C63B-21
VFD300C63B-21
VFD370C63B-21
Following Models have in-built DC reactor:
VFD450C63B-00; VFD550C63B-00
Frame D
VFD450C63B-21; VFD550C63B-21
VFD750C63B-00; VFD900C63B-00; VFD1100C63B-00; VFD1320C63B-00
Frame E
VFD750C63B-21; VFD900C63B-21; VFD1100C63B-21; VFD1320C63B-21
VFD1600C63B-00; VFD2000C63B-00
Frame F
VFD1600C63B-21; VFD2000C63B-21
VFD2500C63B-00; VFD3150C63B-00
Frame G
VFD2500C63B-21; VFD3150C63B-21
VFD4000C63B-00; VFD4500C63B-00; VFD5600C63B-00; VFD6300C63B-00
Frame H
VFD4000C63B-21; VFD4500C63B-21; VFD5600C63B-21; VFD6300C63B-21
1. Leakage current to affect the motor and counter measurement
If the cable length is too long, the parasitic capacitance between cables will enlarge and may
increase leakage current. It will activate the protection of over current, and increased leakage current
will not ensure the correction of current value in display. The worst case is that AC motor drive may
damage.
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.
For the 460V series AC motor drive, when an overload relay is installed between the drive and
the motor to protect motor from overheating, the connecting cable must be shorter than 50m.
However, an overload relay malfunction may still occur. To prevent the malfunction, install an output
reactor (optional) to the drive or lower the carrier frequency setting (Pr.00-17).
2. Surge voltage to affect the motor and counter measurement
When motor is driven by a PWM signals of AC motor drive, the motor terminals will experience
surge voltages (dv/dt) easily due to power transistors conversion of AC motor drive and cable
capacitance. When the motor cable is very long (especially for the 460V series), surge voltages (dv/dt)
may reduce insulation quality. To prevent this situation, please follow the rules below:
a. Use a motor with enhanced insulation
b. Connect an output reactor (optional) to the output terminals of the AC motor drive
c. Reduce the motor cable length to suggested value
Rated Current
(Arms)
HP
LD ND
25 24 20
30 30 24
40 36 30
50 45 36
Chapter 7 Optional Accessories
Saturation Current
(Arms)
HD LD ND
14 28.8 30.0
20 36.0 36.0
24 43.2 45.0
30 54.0 54.0
7-11
4% DC Reactor
(mH)
HD LD ND
25.2 3.661 4.393
36.0 2.928 3.661
43.2 2.440 2.928
54.0 1.952 2.440
HD
6.275
4.393
3.661
2.928