Mitsubishi Electric MELDAS 600M Series Instruction Manual page 437

8.2 Fault examples
When there is a problem or dissatisfaction with the system operation, check the following items before
contacting the service center.
− Fault examples −
• The power cannot be turned ON.
• The power fails after being turned ON.
• The screen does not display.
• The operation keys do not work.
• The HD does not operate.
• The FD does not operate.
• Machining operations cannot be carried out.
[Precautions]
(1) Power-related problems
The power cannot be turned ON.
The power supply cord is
not plugged in or loose.
There is a problem with the
power supply socket.
The external power supply
is faulty.
The ON/OFF cable is
short-circuited.
The input voltage of the
external power supply is not
within the specified range.
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The NC may not start when the outside air temperature is 5°C or less. To protect the HDD
from low temperatures, warm up the HDD with the heater. Check the LED on the operation
board for signs while warming up the HDD. (Refer to the operation board instruction manual
for each machine manufacturer.)
The NC will automatically start when the warming up is completed.
Cause
CAUTION
Do not apply voltages on the connector other than those indicated in this manual. 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 any PCB while the power is ON.
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CHAPTER 3 MAINTENANCE
8. Fault Diagnosis and Action
Recheck the cables between the NC main unit and external power
supply and between the external power supply and socket.
Securely plug them in.
Check for broken wires in the cable. Replace the cable if there are
any broken wires.
Always turn the switch on the socket ON if one is present.
Check whether the specified power voltage and power frequency
are being output from the socket.
Check whether the power is only being supplied by the external
power supply.
Depending on the external power supply being used, the power
supply may not turn ON in a no-load state. Install a load and check
the power supply.
Disconnect the ON/OFF cable and check it for short-circuits.
Replace the cable if short-circuited.
Check whether the input voltage is within +10 or −15% of 200 to
230VAC.
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Remedy