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3. TROUBLESHOOTING
3.2 Troubleshooting
II - 21
The power turns OFF.
Cause Remedy
There is a problem in the power
supply.
Check whether the voltage fluctuates at certain time zones.
Check whether an instantaneous power failure has
occurred.
A problem occurs when the
peripheral device starts
operating.
Check whether the voltage drops instantaneously when the
peripheral device operation starts.
The BTAL (red) LED on the control unit lights.
Cause Remedy
This lights when the voltage of
the battery connected to the BAT
connector drops to 2.6V or less.
Replace the battery following the procedures given in
section 4.3.2 (1).
(2) Problems when starting the system
The NC does not start up correctly.
Cause Remedy
8 is displayed on the control unit
7-segment display LED1 (left
side).
Check that the rotary switch CS1 (left side) is set to 0.
E or F is displayed on the control
unit 7-segment display LED1 (left
side).
Contact the Mitsubishi Service Center.
The WDAL (red) LED on the
control unit lights.
Contact the Mitsubishi Service Center.
Servo READY (SA) does not turn ON.
Cause Remedy
The SRDY (green) LED on the
control unit is not lit.
Check the emergency stop conditions.
The SRDY (green) LED on the
control unit is lit.
Check that the wiring past the DIO connector is correct.
(Check the relay coil's diode connection, etc.) If there is no
output even when the wiring is corrected, the control unit
may be faulty. Check the voltage with a tester. (The voltage
is correct if it is approx. 24V across the relay coil end or
connector DIO's 1B pin (+) and 1A pin (–) when the LED is
lit.)
CAUTION
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.