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MITSUBISHI CNC
4. Wiring and Connecting
4.1 Precautions
CAUTION
Be sure to ground of earth terminal FG and LG. Not doing so could result in electric shock or
operation failure. (Ground resistance: 100Ω or less)
When wiring in the unit, be sure that it is done correctly by checking the product's rated voltage
and the terminal layout. Connecting a power supply that is different from the rating or incorrectly
wiring the product could result in fire or damage.
External connections shall be crimped or pressure welded with the specified tools, or correctly
soldered. Imperfect connections could result in short circuit, fire, or operation failure.
Tighten the terminal screws within the specified torque range. If the terminal screws are loose, it
could result in short circuit, fire, or operation failure. Tightening the terminal screws too far may
cause damages to the screws and/or the module, resulting in drop, short circuit, or operation
failure.
Be sure there are no foreign matters such as sawdust or wiring debris inside the module. Such
debris could cause fire, damage, or operation failure.
The module has an ingress prevention label on its top to prevent foreign matter, such as wiring
debris, from entering the module during wiring.
Do not remove this label during wiring.
Before starting system operation, be sure to remove this label because of heat dissipation.
4.1.1 Power supply wiring
(a) 100VAC, 200VAC and 24VDC wires should be twisted as dense as possible respectively. Connect the
modules with the shortest distance.
Use the wires of the following core size for wiring.
100VAC, 200VAC, 24VDC wires
I/O equipment
Ground wire
(b) Do not bunch or lay them closely the main circuit (high voltage, large current) cables of the 100VAC
and 24VDC with the I/O signal cables. Keep the cable at least 100 mm away from the line.
(c) As a countermeasure to power surge due to thunder, connect a surge absorber for thunder as shown
below.
(Note 1) Separate the ground of the surge absorber for thunder (E1) from that of CNC control unit (E2).
(Note 2) Select a surge absorber for thunder whose power supply voltage does not exceed the maximum
allowable circuit voltage even if at the time of maximum power supply voltage elevation.
68
Application
Recommended core size
2
0.75 to 2mm
2
0.3 to 0.75mm
(Outer diameter: 2.8mm
2
2.0mm
or more
2
or less)
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