Attaching Surge Killers To Control Equipment - Mitsubishi Electric GT14 User Manual

9.3.3

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
Keep the ground cable and
communication cable away
from each other.
Output
Output equipment
such as PLC output unit
Remedy for DC inductive load
Keep the ground cable and
communication cable away
from each other.
Output
Output equipment
such as PLC output unit
C
L: Load
R
Place the surge killer
AC
near the load.
L: Load
D
Place the surge killer
DC
near the load.
9. HANDLING OF POWER WIRING AND SWITCH
9.3 Wiring inside and outside the panel
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