Mitsubishi Electric MELDAS C6 Instruction Manual page 398

(1) Problems related to the power supply
The power does not turn ON.
The external power turns ON but the NC control power does not turn ON.
The power turns OFF.
The BTAL (red) LED on the control unit lights.
CAUTION
Do not apply voltages other than those indicated in the Connection and Maintenance 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.
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Cause
The door interlock is applied.
The external power supply's input
voltage is not as specified.
The external power supply is
faulty.
Cause
The external power supply output
is not correct.
The power cable is disconnected
or broken.
The cable connected from the NC
unit to the peripheral device is
short-circuited.
There is a short circuit in the
configuration card.
Cause
There is a problem in the power
supply.
A problem occurs when the
peripheral device starts
operating.
Cause
This lights when the voltage of
the battery connected to the BAT
connector drops to 2.6V or less.
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8. Fault Diagnosis and Action
8.2 Fault Examples
If the control panel door is not completely closed, close it. If
the door interlock is applied even when the door is closed,
the door interlock circuit is damaged.
Check that the input voltage is within 200 to 230VAC +10
to –15%.
Check that the power can be turned ON with the external
power supply only.
Note) Depending on the external power supply, the power
may not turn ON in the no-load state, so install a
slight load and check.
Disconnect the cable between the NC unit and the external
power supply, and check that the external power supply
output is normal.
Check the cable connected between the NC unit and
external power supply, and securely insert it.
Check that the cable is not broken, and replace if broken.
Disconnect the cable connected to the peripheral device
one at a time and check that the power turns ON. Check
that there are no short-circuited cables.
Remove the removable cards one at a time and check that
the power turns ON.
Check that there are no short-circuited cards.
Check whether the voltage fluctuates at certain time zones.
Check whether an instantaneous power failure has
occurred.
Check whether the voltage drops instantaneously when the
peripheral device operation starts.
Replace the battery.
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Remedy
Remedy
Remedy
Remedy