Mitsubishi Electric MELDAS 600M Series Instruction Manual page 438

The external power supply is ON, but the NC control power supply does not turn ON.
The external power supply
is not correct.
A connection cable from
the NC main unit to a
peripheral
short-circuited.
There is a short-circuit in a
configuration card.
The power fails after being turned ON.
There is a problem with the
power supply socket.
Faults occur when a
peripheral device operation
starts.
The PSEMG (red) LED of the HR081 Card is lit.
The emergency stop switch
connected to the EMG
connector is ON (A contact).
Or, the connection is loose
with the EMG connector.
The BATALM (red) LED of the HR081 Card is lit.
The LED lights when the
voltage of the battery
connected to the HR081
BAT connector becomes
less than 2.6V ± 0.065V.
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Cause
device is
Cause
Cause
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
Disconnect the cable between the NC main unit and the external
power supply, and check whether the external power supply output
is correct.
Connect the cable between the NC main unit and the external
power supply, and check whether the external power supply output
is correct.
Check whether the power is supplied while disconnecting the
connection cables with the peripheral devices one at a time, and
check for short-circuits.
Check whether the power is supplied while removing removable
cards one at a time, and check for short-circuits.
Check whether the voltage fluctuates according to the time of day.
Check whether instantaneous power failures are occurring.
Check whether the voltage is instantaneously dropping when the
peripheral device operation starts.
Release (B contact) the emergency switch. Also check the
connection to the EMG connector.
Replace the battery.
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Remedy
Remedy
Remedy
Remedy