Rfi Filter; Varistors - Control Techniques Unidrive Regen Installation Manual

5.7

RFI filter

In common with conventional drives, significant ground currents are generated by the capacitance of the motor to ground, the motor cables to ground,
and the drive power circuits to their heatsinks.The RFI filter will provide a relatively short return path for ground currents back to the drives power
circuit.
Table 5-7 RFI filter data
Volts
CT Model
Number
Vac
UNI1405 480
UNI2401 to 2402 480
UNI2403 480
UNI3401 to 3403 480
UNI3404 480
UNI3405 480
UNI4401 to 4402 480
UNI4403 to 4404 480
UNI4405 480
UNI5401 480
Do not use an RFI filter without the specified switching frequency filter, as failure of the RFI filter will occur, due to the switching currents.
CAUTION
5.8

Varistors

AC line voltage transients can typically be caused by the switching of large items of plant, or by lightning strikes on another part of the supply system.
If these transients are not suppressed, they can cause damage to the insulation of the Regen input inductors, or to the Unidrive Regen drive
electronics.
Table 5-8 Varistors
Drive
Configuration
size
Line to line 1 to 5
Line to ground 1 to 5
N
NOTE
Seven varistors are required when operating with an IT supply as shown in Figure 3-1 on page 5, Figure 3-2 on page 6 and Figure A-2 on page 32.
5.8.1 Configuration
Varistors should be fitted after the supply fuses, as shown in Figure 5-1:
Figure 5-1 Fitting of Varistors
Fuses Varistors
R
Y
B
550Vac
varistors
Unidrive Regen Installation Guide
Issue Number: 2
Filter
Maximum
current
power
Mounting style
rating
kW A
4 10
Footprint or Book End
7.5 16
Footprint or Book End
11 25
Footprint or Book End
22 50
30 63
37 100
55 150
90 180
110 220
160 300
Varistor Varistor
voltage energy
Vac J
550 400
680 450
RFI
Filter
680Vac
varistors
E
www.controltechniques.com
Motor
cable
length
m
Book End 100
100
Book End 100
100
Book End 100
100
Book End 100
Book End 100
Book End 100
Book End 100
Book End 100
Book End 100
Book End 100
Type number Quantity
Z500NS 3
Z680LNS 3
Switching
Frequency
Filter
CT part
number
4200-6105
4200-6104
4200-6109
4200-6108
4200-6114
4200-6113
4200-6116
4200-6117
4200-6106
4200-6107
4200-6111
4200-6112
4200-6115
CT part number
2482-1501
2482-0680
13