Troubleshooting - Mitsubishi FX 2N-20PSU DC User Manual

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
FX -20PSU
2N
24+ 24-
✩ Never connect the FX
FX -20PSU
2N
24+ 24-

7. TROUBLESHOOTING

When it is suspected that the FX
• 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.
- 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.
HEAD OFFICE
HIMEJI WORKS
JY992D85101B
-20PSU in parallel to another power supply unit.
2N
FX -20PSU or
2N
another power
supply unit
-
+
-20PSU serially to another power supply unit.
2N
FX -20PSU or
2N
another power
supply unit
-
+
-20PSU is not normally operating, check the following items.
2N
-20PSU.
2N
-20PSU.
2N
Manual number : JY992D85101
Manual revision : B
Date
: TOKYO BUILDING, 2-7-3 MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
: 840, CHIYODA CHO, HIMEJI, JAPAN
FX -20PSU
2N
24+ 24-
FX -20PSU
2N
24+ 24-
: SEP . 2008
-20PSU to another
2N
FX PLC
Service power
supply
24V 0V
FX PLC
Service power
supply
24V 0V
Effective SEP . 2008
Specifications are subject to
change without notice