Delta CT2000 Series User Manual page 63

Chapter 7 Optional Accessories CT2000 Series
Model HP
VFD220CT43F00B 30
VFD300CT43F00B 40
VFD370CT43F00B 50
VFD450CT43F00B 60
VFD550CT43F00B 75
VFD110CT43A21C 15
VFD150CT43A21C 20
VFD185CT43A21C 25
VFD220CT43A21C 30
VFD300CT43A21C 40
VFD370CT43A21C 50
VFD450CT43A00C 60
VFD550CT43A00C 75
The length of motor cable
1. 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 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 over heating, 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. When motor is driven by an AC motor drive of PWM type, the motor terminals will experience surge
voltages easily due to components conversion of AC motor 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 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)
Max. continuous
Rated Amps
Amps
(Arms)
(Apeak)
Light Heavy Light
Duty Duty Duty
45 36 76
60 43 102
73 57 124
91 69 154
110 86 187
24 17 41
32 23 54
38 30 64
45 36 76
60 43 102
73 57 124
91 69 154
110 86 187
3% reactor
(mH)
Heavy Light Heavy
Duty Duty Duty
76 0.541 0.639
91 0.405 0.541
121 0.334 0.405
146 0.267 0.334
182 0.221 0.267
36 0.881 1.174
49 0.66 0.881
64 0.639 0.66
76 0.541 0.639
91 0.405 0.541
121 0.334 0.405
146 0.267 0.334
182 0.221 0.267
7-10
5% reactor
input reactor Delta
Built-in
(mH)
DC
Light Heavy reactor Light
Duty Duty Duty
0.902 0.98
X
0.675 0.82
X
0.557 0.62
X
0.445 0.51
X
0.368 0.41
X
1.468 2.07
X
1.100 1.53
X
1.065 1.17
X
0.902 0.98
X
0.675 0.82
X
0.557 0.62
X
0.445 0.51
O
0.368 0.41
O
3%
part#
Heavy
Duty
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A