GE Industrial Solutions AF-600 FP High Power (460V_575V 150HP and above) User Manual
Page 67
130BX139.12
e
l
b
a
c
r
o
t
o
M
e
n
i
L
C
A
Motor
Stray capacitance
Signal wiring
to BMS
Converter
Frequency
Illustration 5.3: Signal Conductor Currents
Unprotected or poorly routed signal conductors located close to or in parallel to motor and mains conductors are susceptible to EMI.
Signal conductors are especially vulnerable when they are run parallel to the power conductors for any distance. EMI coupled into these conductors can affect
either the frequency converter or the interconnected control device. See Illustration 5-4.
While these currents will tend to travel back to the frequency converter, imperfections in the system will cause some current to flow in undesirable paths thus
exposing other locations to the EMI.
130BX140.12
e
l
b
a
c
r
o
t
o
M
e
n
i
L
C
A
Converter
Motor
Stray capacitance
AC Line
Frequency
Illustration 5.4: Alternate Signal Conductor Currents
High frequency currents can be coupled into the mains supplying the frequency converter when the mains conductors are located close to the motor cables.
AF-650 GP and AF-600 FP High Power Service Manual
66
5