HEAD OFFICE
: MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310
TELEX : J24532 CABLE MELCO TOKYO
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
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
x
m. Securely tighten terminals so that malfunction does not
occur.
For M3(0.12in)
Max. 6.2mm (0.24in)
Max. 6.2mm (0.24in)
[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
. Such wiring may damage the unit.
•
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
2N
-20PSU is connected to 24V DC power type PLC
24+ 24-
L
N
24V 0V
X1
X2
X5
PLC
Sensor 1
Sensor 2
Class 3
grounding
85 to 264V AC
FX
2N
-20PSU
S/S
X7
24+ 24-
L
N
24V 0V
X1
X2
X5
PLC
Sensor 1
Sensor 2
Class 3
grounding
85 to 264V AC
FX
2N
-20PSU
S/S
X7
Source inputs (-ve S/S)
Sink inputs (+ve S/S)
6.2 When FX
2N
-20PSU is used together with 24V DC service power supply built in PLC
In the AC power type FX PLC, a 24V DC service power supply is built.
When using the FX
2N
-20PSU and the service power supply together, connect the "24-" terminal of the
FX
2N
-20PSU and the "COM" terminal on the minus side of the service power supply as shown in the fig-
ure below.
24+ 24-
L
N
Class 3
grounding
85 to 264V AC
FX
2N
-20PSU
Connect the minus line to share it.
L
N
X1
X2
X5
PLC
S/S
X7
24V 0V
24V
Service
power supply
Sensor 1
Sensor 2
24+ 24-
L
N
Class 3
grounding
85 to 264V AC
FX
2N
-20PSU
Connect the minus line to share it.
L
N
X1
X2
X5
PLC
S/S
X7
24V 0V
24V
Service
power supply
Sensor 1
Sensor 2
Source inputs (-ve S/S)
Sink inputs (+ve S/S)
6.3 Cautions
Cautions on design
•
Never connect in serial nor parallel the DC output terminals of the FX
2N
-20PSU to another
power supply unit.
Such a connection may damage the unit.
✩
Never connect the FX
2N
-20PSU in parallel to another power supply unit.
✩
Never connect the FX
2N
-20PSU serially to another power supply unit.
24+ 24-
FX
2N
-20PSU
FX
2N
-20PSU or
another power
supply unit
+
-
24+ 24-
FX
2N
-20PSU
FX PLC
Service power
supply
24V
0V
24+ 24-
FX
2N
-20PSU
FX
2N
-20PSU or
another power
supply unit
+
-
24+ 24-
FX
2N
-20PSU
FX PLC
Service power
supply
24V
0V
7. TROUBLESHOOTING
When it is suspected that the FX
2N
-20PSU is not normally operating, check the following items.
•
Check the POWER LED status.
[When the POWER LED is extinguished]
-
Check the input voltage of the FX
2N
-20PSU.
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
2N
-20PSU.
If any abnormality is detected
→
Input the specified supply voltage.
-
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 : A
Date
: FEB. 2000
JY992D85101A
Effective FEB. 2000
Specifications are subject to
change without notice
