Mitsubishi Electric FX3S-10M series Hardware Manual page 3

3. Power supply/input/output specifications and
examples of external wiring
For the details refer to the following manual.
→ Refer to FX Series User's Manual - Hardware Edition.
3S
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.
1) 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).
2) 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.
3) 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.
4) Note that when an error occurs in a relay or transistor 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.
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.
• Even if the DC power supply causes an instantaneous power failure for
less than 5 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).
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.
• The temperature rating of the cable should be 80°C or more.
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: 100 Ω or less) to the
2
grounding terminal on the main unit with a wire 2 mm or thicker.
Do not use common grounding with heavy electrical systems (refer to
section 3.3).
WIRING
PRECAUTIONS
• 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.
3.1 Wiring
3.1.1 Cable end treatment and tightening torque
For the terminals of FX series PLC, M3 screws are used.
3S
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.
• When one wire is connected to one terminal
φ3.2 (0.13")
Terminal Solderless
screw terminal
6.2 mm (0.24")
or less
φ3.2 (0.13")
6.2 mm (0.24")
Terminal
or less
<Reference>
Terminal Applicable Pressure
Type No. Certification
manufacturer cable bonding tool
AWG
FV1.25-B3A
22 to 16
J.S.T. Mfg. YA-1 (J.S.T.
UL Listed
Co., Ltd. Mfg. Co., Ltd.)
AWG
FV2-MS3
16 to 14
*1
• When two wires are connected to one terminal
φ3.2 (0.13")
Terminal Solderless
6.2 mm (0.24")
screw terminal
or less
6.3 mm (0.25")
or more
φ3.2 (0.13")
Terminal
6.2 mm (0.24")
or less
6.3 mm (0.25")
or more
<Reference>
Terminal Applicable Pressure
Type No. Certification
manufacturer cable bonding tool
J.S.T. Mfg. AWG YA-1 (J.S.T.
FV1.25-B3A UL Listed
Co., Ltd. 22 to 16 Mfg. Co., Ltd.)
*1 To adapt the LVD directive (EN61010-2-201:2013) of the EC
directive, avoid the wiring with two wires to the built-in terminal, and take
an appropriate action such as adding an external terminal.
For the time of compliance with the LVD directive (EN61010-2-201:2013),
refer to FX 3S Series User's Manual - Hardware Edition.
3.2 Power supply specifications and example of external
wiring
For details, refer to the following manual.
→ Refer to FX
3S Series User's Manual - Hardware Edition.
3.2.1 Power supply specifications
Specification
Item
AC power type DC power type
Supply voltage 100 to 240 V AC 24 V DC
Voltage fluctuation range -15%, +10% -15%, +10%
Rated frequency 50/60 Hz
Operation can be Operation can be
continued upon continued upon
Allowable instantaneous power occurrence of occurrence of
failure time instantaneous instantaneous
power failure for 10 power failure for 5
ms or less. ms or less.
Power fuse 250 V 1 A 250 V 1.6 A
15 A max. 5 ms or
less/100 V AC 20 A max. 1 ms or
Rush current
28 A max. 5 ms or less/24 V DC
less/200 V AC
FX -10M 19 W 6 W
3S
FX -14M 19 W 6.5 W
Power 3S
*1
consumption
FX -20M 20 W 7 W
3S
FX -30M 21 W 8.5 W
3S
24 V DC service power supply 400 mA
*1 This item shows values when all 24 V DC service power supplies are
used in the maximum configuration connectable to the main unit, and
includes the input current (5 or 7 mA per point). (The DC power type main
unit does not have a 24 V DC service power supply.)
3.2.2 Example of external wiring [AC power type]
100 to 240 V AC power is supplied to the main unit.
100 to 240 V AC
Breaker
Power on
Emer-
gency
stop
PL
MC
Main unit
MC
Fuse
L
Class D
grounding
N
MC
DC
power
supply
DC AC
Power supply for loads connected
to PLC output terminals
3.2.3 Example of external wiring [DC power type]
24 V DC power is supplied to the main unit.
-
Main unit
Fuse
Class D
grounding
MC
Power supply for loads connected
to PLC output terminals
3.3 Grounding
Ground the PLC as stated below.
• Perform class D grounding. (Grounding resistance: 100 Ω or less)
-
• Ground the PLC independently if possible.
If it cannot be grounded independently, ground it jointly as shown below.
Other Other
PLC PLC
equipment equipment
Independent grounding Shared grounding
(Best condition) (Good condition)
• Use ground wires thicker than AWG14 (2 mm
• Position the grounding point as close to the PLC as possible to decrease the
length of the ground wire.
MC
24 V DC
Circuit protector
Power on
Emer-
gency
stop
PL
MC
MC
MC
Other
PLC
equipment
Common grounding
(Not allowed)
2
).