Precautions; Precautions For Power Supply Wiring - Mitsubishi Electric C80 Series Connection And Set Up Manual

C80 Series Connection and Setup Manual
6 Wiring and Connecting

6.1 Precautions

CAUTION
Be sure to ground of earth terminal FG and LG (Ground resistance: 100Ω or less). Not doing so could result in
electric shock or operation failure.
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.

6.1.1 Precautions for 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 install 100VAC or 24VDC wires together with the main circuit lines (high voltage and large current) or I/O
signal wires (including common lines). Keep the cable at least 100 mm away from the line.
(c) A momentary power failure may be detected, or the CPU module or remote head module may be reset because of
the lightning surge noise. As a measure against the lightning surge noise, connect a surge absorber for lightning as
shown below. Using the surge absorber for lightning can reduce the influence from the lightning.
(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.
IB-1501452-C
Application
0.75 to 2mm
0.3 to 0.75mm
2.0mm
AC
E1
72
Recommended core size
2
2
(Outer diameter: 2.8mm
2
or more, wire length: 30cm or less
C80
E2
Surge absorber
for lightening
2
or less)