Mitsubishi Electric C80 Series Connection And Set Up Manual page 14

CAUTION
When using the RS-232C device as a peripheral device, caution must be paid for connector connection/
disconnection. Always use a double-OFF type AC power supply switch on the device side, and connect/
disconnect the connector with the AC power supply on the device side OFF.
Switch
Device
NC unit
AC socket
RS-232C
Using a stabilized power supply without overcurrent protection may cause the unit's failure due to
miswiring of 24V.
12V, 5V, and 3.3V output from connectors are to supply the power for dedicated peripheral devices. Do not
use for other equipment to supply the power since we do not guarantee the NC operation by voltage down
or noise sneaking.
When using an inductive load such as a relay, always connect a diode in parallel to the load to prevent a
counter-electromotive force.
When the rush current exceeds the maximum output current, always connect a protective resistor serially
to the load to suppress rush currents.
The wires from the surge absorber should be connected without extensions.
Be sure to ground the 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.
When connecting to a personal computer and a unit with the USB interface, an electric shock or a unit
failure may occur.
Operate these correctly according to the manual of a unit and a personal computer.
Observe the following cautions when a personal computer in an AC power supply is used.
(1) For a personal computer that uses a 3-pin power plug or power plug with a ground lead type, make sure
to use a plug socket including a ground input electrode or ground the earth lead, respectively.
And, ensure to ground a personal computer and a unit. (Ground resistance: 100Ω or less)
(2) For a personal computer that uses a 2-pin power plug without ground lead, make sure to connect the
unit to the personal computer according to the following procedures. And, it is recommended to supply the
same power supply line to a personal computer and the unit.
(a) Pull out the power plug of the personal computer from the AC outlet.
(b) Confirm that the power plug of the personal computer has been pulled out from the AC outlet, and
connect USB cables, the extension cable or the bus connection cable of a GOT.
(c) Insert the power plug of the personal computer into the AC outlet.