Power Supply/Input/Output Specifications/Examples Of External Wiring; Installation Location; Installation; Procedures For Installing Directly - Mitsubishi Electric FX3U-32MR/ES User Manual

2.2

Installation location

Install the PLC in an environment conforming to the generic
specifications (section 2.1), installation precautions and notes.
For more details, refer to FX Series User's Manual - Hardware
3U
Edition.
Installation location in enclosure
Space in enclosure
Extension devices can be connected on the left and right sides of the
main unit of the PLC.
If you intend to add extension devices in the future, keep necessary
spaces on the left and right sides.
Configuration without extension cable
A
FX
3U
A A
Series
main
unit
A
A
≥ 50 mm (1.97")
Configuration in 2 stages with extension cable
A
A
FX Series
3U
A
main unit
A Extension
cable
Input/output ·FX 0N -65EC
·FX 0N -30EC
powered
A
extension
A
Another
unit
equipment
A
Another equipment
A ≥ 50 mm (1.97")
2.2.1 Affixing the dust proof sheet
The dust proof sheet should be affixed to the ventilation port before
beginning the installation and wiring work.
For the affixing procedure, refer to the instructions on the
dust proof sheet.
Be sure to remove the dust proof sheet when the installation and
wiring work is completed.
2.3 Procedures for installing to and detaching from
DIN rail
The products can be installed on a DIN46277 rail [35 mm (1.38")
wide]. This section explains the installations of the main units.
For the input/output extension units/blocks and special adapters,
refer to the following manual.
Refer to FX Series User's Manual - Hardware Edition.
3U
2.3.1

Installation

1) Connect the expansion boards and special adapters to the main
unit.
2) Push out all DIN rail mounting hooks (below fig.A)
B
2) 2)
A
2) 2)
A
3) Fit the upper edge of the DIN rail
mounting groove (right fig.B)
onto the DIN rail.
B
4) Lock the DIN rail mounting hooks (below fig.C) while pressing the
PLC against the DIN rail.
C C
4) 4)
2.4 Procedures for installing directly (with M4
screws)
The product can be installed directly on the panel (with screws).
This section explains the installation of the main units.
As for the details of the installation/detaching for input extension
units/blocks and special adapters, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
2.4.1 Mounting hole pitches
Refer to the External Dimensions (section 1.2) for the product's
mounting hole pitch information.
As for the details of the mounting hole pitches for extension unit/
block and special adapters, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
2.4.2 Installation
1) Make mounting holes in the
mounting surface referring to
the external dimensions
diagram.
B
2) Fit the main unit (A in the right
figure) based on the holes, and
secure it with M4 screws (B in
the right figure).
The mounting hole pitches and
number of screws depend on
A
t h e p r o d u c t . R e f e r t o t h e
external dimensions diagram.
3. Power supply/input/output specifications
and examples of external wiring
As for the details of the power supply wiring and input/output wiring,
refer to FX 3U Series User's Manual - Hardware Edition.
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) Note that the output current of the 24 V DC service power
supply varies depending on the model and the absence/
presence of extension blocks. If an overload 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, triac 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
 Simultaneously turn on and off the power supplies of the main
unit and extension devices.
 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 5ms, 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.
supply is restored, it will automatically restart (when the RUN
input is on).
WIRING
B
PRECAUTIONS
 Make sure to cut off all phases of the power supply externally
before installation or wiring work.
Failure to do so may cause electric shock or damage to the
product.
WIRING
PRECAUTIONS
 Connect the AC power supply 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.
 Do not wire vacant terminals externally.
Doing so may damage the product.
 Perform class D grounding (grounding resistance: 100  or
less) to the grounding terminal on the FX
a wire 2 mm 2 or thicker.
Do not use common grounding with heavy electrical systems
(refer to section 3.3).
 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 terminal 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.
- The disposal size of the cable end should follow the
dimensions described in the manual.
- Tightening torque should follow the specifications in the
manual.
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.
 Extension cables are easily affected by noise. Lay the cables
at a distance of at least 30 to 50 mm (1.19" to 1.97") away from
the PLC output and other power lines.
When the power
PLC main unit with
3U