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7. WIRING
7.2 Wiring inside and outside the panel
7.2.3 Attaching surge killers to control equipment
If communication errors happen in synch with the on/off signals from certain control equipment (referred to as "load"
hereafter) such as no fuse breakers, electromagnetic contactors, relays, solenoid valves, and induction motors, surge
noise interference is suspected.
If this problem happens, keep the ground cable and communication cable away from the load.
If that is not possible, an installation of a surge killer will help reduce noise interference.
Place the surge killer as close to the load as possible.
Remedy for AC inductive load
Remedy for DC inductive load
Output
AC
C
R
L:Load
Keep the ground cable and
communication cable away
from each other.
Place the surge killer near the load.
Output equipment
such as PLC output unit
DC
D
Output
L:Load
Keep the ground cable and
communication cable away
from each other.
Place the surge killer near the load.
Output equipment
such as PLC output unit