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7. Troubleshooting
7.2 When in Trouble
III-56
(2) Problems when starting the system
The NC does not start up correctly.
Cause
Remedy
8 is displayed on the CPU card's
7-segment display NCLD1.
Check that the rotary switch NCSYS is set to 0. If not set to
0, set to 0 and restart.
E or F is displayed on the CPU
card's 7-segment display NCLD1.
Contact the Mitsubishi Service Center.
(3) Problems related to remote I/O
The communication alarm LED RAL is lit.
Cause Remedy
The remote connection cable
(SH41) of RIO System 1 or
System 2 is not connected.
The cable has broken wires or the
contact is defective.
Check the connection of the remote connection cable F010
with the NC control section or the cable SH41 between the
remote I/Os.
The HR3×× card is defective. Contact the Mitsubishi Service Center, and then replace the
card.
The power supply system LED is not lit.
Cause Remedy
The 24IN LED is not lit. (The input
power is not being supplied.)
Supply a +24V
±
5% voltage to the HR3OO card.
The 5OUT LED is not lit.
(The input power is not within the
tolerable range, or the internal
power is faulty.)
Check that the input voltage is not +20V or less. If it is being
supplied correctly, contact the Mitsubishi Service Center.
Do not apply voltages other than those indicated in this manual on the connector.
Doing so may lead to destruction or damage.
Incorrect connections may damage the devices, so connect the cables to the
specified connectors.
Do not connect or disconnect the connection cables between each unit while the
power is ON.
Do not connect or disconnect the PCBs while the power is ON.
CAUTION