Mitsubishi FX 2N-20PSU DC User Manual page 8

5. INSTALLATION
Cautions on installation
• Use the unit in the environment for the general specifications described in Section 3 in the
manual.
Never use the unit in a place with dust, soot, conductive dusts, corrosive gas or flammable gas,
place exposed to high temperature, dew condensation, rain and wind, or in a place exposed to
vibration or impact.
If the unit is used in such a place, electrical shock, fire, malfunction, damages in the unit or
deterioration of the unit may be caused.
• Never drop cutting chips or electric wire chips into the ventilation window while drilling screw
holes or wiring cables.
Such chips may cause fire, failure or malfunction.
• After finishing installation, remove a dust preventing sheet adhered on the ventilation window.
If the sheet remains attached, fire, failure or malfunction may be caused.
Note
✩ During the installation/wiring work, place a dust preventing sheet on the ventilation window.
✩ In order to prevent temperature rise, never install the unit on the floor surface, on the ceiling surface or
in the vertical direction.
Make sure to install the unit on a panel face in the horizontal direction as shown in the figure below.
✩ Use crimp-style terminals of the dimensions shown in the figure below.
✩ Tighten terminals at a torque of 0.5 to 0.8 N m. Securely tighten terminals so that malfunction does not
occur.
[Installation direction]
[Crimp-style terminal]
6. WIRING
Cautions on wiring
• Make sure to shut down the power supplies of all phases on the outside before starting instal-
lation or wiring.
If the power supplies are not shut down, you may get electrical shock or the unit may be dam-
aged.
• Make sure to attach terminal covers offered as accessories before supplying power and start-
ing operation after the installation/wiring work.
• Correctly supply power to the PLC in accordance with "Cautions on Safety" described in the
manual of the PLC.
If power is not correctly supplied, the unit may be damaged.
• Connect the wiring of the DC power supply to dedicated terminals as described in this manual.
If the AC power supply is connected to a DC power terminal, the unit may be burnt.
• Never perform external wiring to unused terminals
• Perform Class 3 grounding to the grounding terminal in the unit. However, never perform com-
mon grounding (See Section 3) with a strong power system.
6.1 When FX -20PSU is connected to 24V DC power type PLC
2N
Source inputs (-ve S/S)
85 to 264V AC
Class 3
grounding
L
FX -20PSU
2N
24+ 24-
Sink inputs (+ve S/S)
85 to 264V AC
Class 3
grounding
L
FX -20PSU
2N
24+ 24-
6.2 When FX -20PSU is used together with 24V DC service power supply built in PLC
2N
In the AC power type FX PLC, a 24V DC service power supply is built.
When using the FX
FX -20PSU and the "COM" terminal on the minus side of the service power supply as shown in the fig-
2N
ure below.
Source inputs (-ve S/S)
85 to 264V AC
Class 3
grounding
L
FX -20PSU
2N
24+ 24-
•
. Such wiring may damage the unit.
Sink inputs (+ve S/S)
85 to 264V AC
Class 3
grounding
L
FX -20PSU
2N
24+ 24-
Sensor 1 Sensor 2
N 24V 0V X1 X2 X5
S/S
PLC
Sensor 1 Sensor 2
N 24V 0V S/S X1 X2 X5
PLC
-20PSU and the service power supply together, connect the "24-" terminal of the
2N
Sensor 1 Sensor 2
N L N 24V 0V X1 X2
S/S
PLC
24V
Service
power supply
Connect the minus line to share it.
Sensor 1 Sensor 2
N L N 24V 0V X1 X2
S/S
PLC
24V
Service
power supply
Connect the minus line to share it.
6.3 Cautions
Cautions on design
• Never connect in serial nor parallel the DC output terminals of the FX
power supply unit.
Such a connection may damage the unit.
✩ Never connect the FX
-20PSU in parallel to another power supply unit.
2N
FX -20PSU or
2N
FX -20PSU
2N
another power
X7
supply unit
24+ 24-
+
✩ Never connect the FX
-20PSU serially to another power supply unit.
2N
FX -20PSU or
2N
FX -20PSU
2N
another power
supply unit
24+ 24-
+
X7
7. TROUBLESHOOTING
When it is suspected that the FX -20PSU is not normally operating, check the following items.
2N
• Check the POWER LED status.
[When the POWER LED is extinguished]
- Check the input voltage of the FX
If any abnormality is detected → Input the specified supply voltage.
- Disconnect the wiring from the output terminals "24+" and "24-".
If the POWER LED lights → The overcurrent protection circuit (See Section 4) is actuated.
Investigate the load connected to the output terminals.
If the POWER LED remains extinguished → The overvoltage protection circuit (See Section 4)
may be actuated. Ask for inspection and repair.
[When the POWER LED is lit]
- Check the input voltage of the FX
If any abnormality is detected → Input the specified supply voltage.
X5 X7
- Check the external wiring.
If any abnormality is detected → Correct the wiring (See Section 6).
• The overcurrent protection circuit and the overvoltage protection circuit are built in the FX2N-20PSU.
If such a protection circuit is actuated, the output voltage drops or is shut down. For details, refer to
Section 4.
Manual number : JY992D85101
Manual revision : B
Date
X5 X7
HEAD OFFICE : TOKYO BUILDING, 2-7-3 MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
JY992D85101B
-20PSU to another
2N
FX -20PSU FX PLC
2N
Service power
supply
- 24+ 24- 24V 0V
FX -20PSU FX PLC
2N
Service power
supply
- 24+ 24- 24V 0V
-20PSU.
2N
-20PSU.
2N
: SEP . 2008
Effective SEP . 2008
Specifications are subject to
change without notice