Causes Of Wiring-Related Malfunction And Countermeasure Examples - Mitsubishi Electric GOT SIMPLE Series Operation Manual

Causes of wiring-related malfunction and countermeasure
examples
Causes of a malfunction due to grounding of the GOT include potential difference caused by grounding and noise.
The following measures may reduce potential difference and noise.
Wiring of the ground cable and power line of the GOT
When the ground cable and power line of the GOT are installed together, the GOT may malfunction due to noise.
Separating the ground cable and power line of the GOT in wiring reduces the influence of noise.
GOT
FG
Power for the
power equipment
Good example: The ground and power cables
are separated in wiring.
When leading the ground cable from the control panel having control equipment into
the control panel having the GOT
When a single ground cable is led from the control panel having control equipment, including a PLC, into the control panel
having the GOT, the cable may be directly connected to the power terminal of the GOT.
Connection
cable
Ground cable led from
FG
the panel having
the control equipment
The malfunction due to the potential difference caused by the grounding in such a case may be prevented by reducing the
voltage as shown in countermeasure example 1 below.
GOT
FG
Power for the
power equipment
Bad example: The ground and power cables
are installed together.
GOT
8 WIRING OF POWER SUPPLY SECTION
8.3 Grounding
8
91