3-2
SM-18006
TROUBLESHOOTING
3.1 Initial Troubleshooting
3.1.1 Checking Electrical Wiring and Power Supply
Check the following items for any abnormalities in the activation of the system.
No. Check Situation Check Method
1 Is any power supply breaker or
fuse open?
Check the voltage (secondary side) of the breaker and also
check the continuity of the fuse with a tester.
2 Is the voltage at the secondary
side of the transformer correct?
Disconnect at the secondary side of the transformer and measure
voltage with a tester.
3 Is the wiring rmly secured and
correctly connected?
Check that the following wiring connections on W.S./I.U. printed circuit
boards (PCBs) are not loose.
• The connection for thermistors
• The connection for the wired controller cable
• The communication cable connects to a terminal block at the I.U./W.S.
not the printed circuit board.
• Power supply wiring is connected to a terminal block not PCB.
Check that the wiring connections on W.S./I.U. PCBs are not loose or
misconnected on the site according to the “Electrical Wiring Diagram” of
the Engineering Manual.
NOTICE:
If the fuse(s) on an I.U. PCB is blown, diagnose the cause of overcurrent and replace the fuse(s).
In addition, check the power supply of optional equipment because the fuse(s) may blow due to an external
power supply failure. Turn off power for safety.
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