Wiring Of External Power Supply - Mitsubishi Electric GOT2000 Series User Manual

7.1

Wiring of External Power Supply

■1. Separating the power supply system
Carry out wiring so that the power supply system is separated into the GOT, I/O equipment, and power equipment as
shown below.
When frequent noise is identified, connect an isolation transformer.
■2. Separating the power cables from the main circuit line and the I/O signal line
Separate the 100 V AC, 200 V AC, and 24 V DC cables from the main circuit lines (high voltage, large current) and I/O
signal lines.
Separate them with a distance of 100 mm or more as a guide.
■3. Treatment on power cables
Twist 100 V AC, 200 V AC, and 24 V DC cables as closely as possible, and connect the cables with the minimum
length between the power supply and each device.
To minimize the voltage drop, use thick wires as much as possible (Cable cross section: 0.75 mm2 to 2 mm2).
Use M3 solderless terminals, and securely tighten them with a tightening torque of 0.5 N·m to 0.8 N·m to prevent any
problems.
■4. Connecting the lightning surge absorber
As measures against surge due to lightning, connect a lightning surge absorber as shown below.
Separate the grounding of the lightning surge absorber (E1) from the grounding of the GOT (E2).
Select an appropriate lightning surge absorber that has the maximum allowable circuit voltage withstanding the
maximum power supply voltage.
Isolation
GOT
transformer
power
Main power
T1
I/O power
Main circuit power
AC
E1
GOT
I/O equipment
Main circuit equipment
GOT
E2
Lightening surge
←
absorber

7.1 Wiring of External Power Supply

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