Specifications And Wiring; Wiring - Mitsubishi Electric FX3S Quick Start Manual

FX3S QUICK START MANUAL

4. SPECIFICATIONS AND WIRING

DANGER: DESIGN PRECAUTIONS
• Make sure to have the following safety circuits outside of the PLC
to ensure safe system operation even during external power supply
problems or PLC failure. Otherwise, malfunctions may cause serious
accidents.
Most importantly, have the following: an emergency stop circuit,
„ „
a protection circuit, an interlock circuit for opposite movements
(such as normal vs. reverse rotation), and an interlock circuit
(to prevent damage to the equipment at the upper and lower
positioning limits).
Note that when the PLC CPU detects an error, such as a
„ „
watchdog timer error, during self-diagnosis, all outputs are turned
off. Also, when an error that cannot be detected by the PLC CPU
occurs in an input/output control block, output control may be
disabled. External circuits and mechanisms should be designed to
ensure safe machinery operation in such a case.
If an overload of the 24 V DC service power supply occurs, the
„ „
voltage automatically drops, inputs in the PLC are disabled,
and all outputs are turned off. External circuits and mechanisms
should be designed to ensure safe machinery operation in such a
case.
Note that when an error occurs in a relay output device, the output
„ „
could be held either on or off. For output signals that may lead to
serious accidents, external circuits and mechanisms should be
designed to ensure safe machinery operation in such a case.
CAUTION: DESIGN PRECAUTIONS
• Do not bundle the control line together with or lay it close to the main
circuit or power line. As a guideline, lay the control line at least 100
mm (3.94") or more away from the main circuit or power line. Noise
may cause malfunctions.
• Install module so that excessive force will not be applied to
peripheral device connectors. Failure to do so may result in wire
damage/breakage or PLC failure.
NOTES:
• Even if the AC power supply causes an instantaneous power failure
for less than 10 ms, the PLC can continue to operate.
• If a long-time power failure or an abnormal voltage drop occurs,
the PLC stops, and output is turned off. When the power supply is
restored, it will automatically restart (when the RUN input is on).
DANGER: WIRING PRECAUTIONS
Make sure to cut off all phases of the power supply externally before
attempting installation or wiring work. Failure to do so may cause
electric shock or damage to the product.
CAUTION: WIRING PRECAUTIONS
• Connect the power supply wiring to the dedicated terminals
described in this manual. If an AC power supply is connected to a
DC input/output terminal or DC power supply terminal, the PLC will
burn out.
• Noise resistance may be lower when the L and N wires of an AC
power supply are not wired correctly. Please wire using the correct
polarity.
• Do not wire vacant terminals externally. Doing so may damage the
product.
• Perform class D grounding (grounding resistance: 100Ω or less) to
the grounding terminal on the main unit with a wire 2 mm² or thicker.
8
• Do not use common grounding with heavy electrical systems.
Mitsubishi Electric Automation, Inc.
• When drilling screw holes or wiring, make sure cutting or wire debris
does not enter the ventilation slits. Failure to do so may cause fire,
equipment failures or malfunctions.
• Make sure to properly wire to the main unit in accordance with the
following precautions. Failure to do so may cause electric shock,
equipment failures, a short circuit, wire breakage, malfunctions, or
damage to the product.
Make sure to properly wire to the main unit in accordance with the
„ „
rated voltage, current, and frequency of each terminal.
The disposal size of the cable end should follow the dimensions
„ „
described in the manual.
Tightening torque should follow the specifications in the manual.
„ „
Tighten the screws using a Phillips-head screwdriver No.2 (shaft
„ „
diameter 6mm (0.24") or less). Make sure that the screwdriver
does not touch the partition part of the terminal block.
NOTES:
• Input/output wiring 50 to 100 m (164'1" to 328'1") long will cause
almost no problems of noise, but, generally, the wiring length should
be less than 20 m (65'7") to ensure the safety.

4.1 WIRING

n CABLE END TREATMENT AND TIGHTENING TORQUE
• For the terminals of FX3S series PLC, M3 screws are used.
The electric wire ends should be treated as shown below.
• Tighten the screws to a torque of 0.5 to 0.8 N•m.
• Do not tighten terminal screws with a torque outside the above-
mentioned range. Failure to do so may cause equipment failures or
malfunctions.
n WHEN ONE WIRE IS CONNECTED TO ONE TERMINAL
φ3.2 (0.13")
6.2 mm (0.24")
or less
φ3.2 (0.13")
6.2 mm (0.24")
or less
Terminal Manufacturer Type No.
FV1.25-B3A
JAPAN SOLDERLESS
TERMINAL MFG CO
FV2-MS3
LTD (JST)
n WHEN TWO WIRES ARE CONNECTED TO ONE TERMINAL
φ3.2 (0.13")
6.2 mm (0.24")
or less
6.3 mm (0.25")
or more
φ3.2 (0.13")
6.2 mm (0.24")
or less
6.3 mm (0.25")
or more
Terminal Manufacturer Type No.
JAPAN SOLDERLESS
TERMINAL MFG CO FV1.25-B3A
LTD (JST)
Terminal Solderless
screw terminal
Terminal
Pressure
Certification
Bonding Tool
UL Listed YA-1(JST)
Terminal Solderless
screw terminal
Terminal
Pressure
Certification
Bonding Tool
UL Listed YA-1(JST)