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PACMotion VFD Input/Output Chokes Installation Guide
GFK-3185A
Section 3:
3.1
Using Output Chokes
AC Inverters use a fast switching pulse width modulation (PWM) technique to create a variable
frequency AC Output to the connected motor. The fast switching of the output of the drive when
connected with long motor cables results in a reflected voltage at the motor which can be up to three
times the AC supply voltage, with a very fast rise time. Output chokes help to reduce this peak voltage,
and increase the rise time, to reduce the stress applied to the motor insulation and prevent damage.
Output chokes are recommended whenever any of the following conditions are met:
•
•
•
3.2
Dimensions – Open Type
Part Number
VFD
Size
IC866-OCH-008-603-20
1
IC866-OCH-012-603-20
2
IC866-OCH-030-603-20
3
IC866-OCH-075-603-20
4 &
5
IC866-OCH-180-603-00
5 &
6
IC866-OCH-300-603-00
7
Figure 10: IC866-OCH-008-603-20 through
IC866-OCH-075-603-20
Output Line Chokes
Output Line Chokes
The connected motor is not known to be suitable for use with a PWM output Inverter (as
confirmed with the motor manufacturer)
The motor cable length exceeds the maximum permissible motor cable length stated for the
product in the relevant user manual
Specified cable lengths apply to standard type copper shielded cable only
o
For unshielded cables, the maximum length may increase by 50%
o
Using a choke allows the maximum cable length to increase by 100%
o
High capacitance motor cable is used, e.g. typically fire-resistant cables
Connection
L
H
(mm)
(mm)
2.5 mm
2
95
107
4 mm
2
125
158
10 mm
2
155
185
35 mm
2
190
223
11 mm
340
292
9 mm
380
310
B
N1
N2
(mm)
(mm)
(mm)
(mm)
61
56
43
76
100
55
66
130
57
92
170
68
138
248
110
10 x 18
180
248
139
10 x 18
Figure 11: IC866-OCH-180-603-00 through
IC866-OCH-300-603-00
Section 3
August 2020
ØD
Rate
Rated
Inductance
d
Amps
(mH)
Volts
4
8
5
12
500
8
30
Max
8
75
180
400
Max
300
0.053
Weight
(kg)
2.0
1.5
1.7
2.8
0.5
4.2
0.22
8.6
0.09
32
48
5
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