Mitsubishi GT14 User Manual page 58

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Connecting the ground cable from the panel that houses control equipment to the panel to
which the GOT is grounded
When running a single ground cable from the panel that houses such piece of control equipment as a PLC to the
panel to which the GOT is grounded, the ground cable may have to be directly connected to the terminal on the GOT.
If electric potential difference between the ground points created by it causes malfunctions, lowering the voltage as
shown in Remedy 1 below may solve the problem.
• Remedy 1 (Refer to the figures Remedy 1-1 and 1-2 below.)
If the electric potential difference between the ground cable and the panel that houses the GOT is creating
problems, connect the ground cable to the panel also.
If the wiring method as shown in Remedy 1-1 is not feasible, follow Remedy 1-2.
Connection cable
Ground cable from
the panel that
houses control
equipment
Use the thickest
cable possible.
If taking Remedy 1 worsens noise interference, taking Remedy 2 may alleviate it.
• Remedy 2 (Refer to the figures Remedy 2-1 and 2-2 below.)
Attach a ferrite core to the cable if noise from the GOT panel has adverse effects on the GOT when Remedy 1
is taken.
Wind the wire around the ferrite core several times (approx. 3 times), if a ferrite core is used.
If the wiring method as shown in Remedy 2-1 is not feasible, follow Remedy 2-2.
Connection cable
Ground cable from
the panel that
houses control
equipment
Use the thickest
cable possible.
7 - 4
7. WIRING
7.1 Power Supply Wiring
Connection cable
Ground cable from
the panel that
houses control
equipment
FG
Panel
grounding
Remedy 1-1
FG
Ferrite core
Panel
grounding
Remedy 2-1
FG
Connection cable
Ground cable from
the panel that
houses control
equipment
Use the thickest
cable possible.
Remedy 1-2
Connection cable
Ground cable from
the panel that
houses control
equipment
Use the thickest
Ferrite core
cable possible.
Remedy 2-2
FG
Panel
grounding
FG
Panel
grounding