Mitsubishi Electric MELDAS C6 Instruction Manual page 399

(2) Problems when starting the system
The NC does not start up correctly.
Servo READY (SA) does not turn ON.
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.
Downloaded from ManualsNet.com
Cause
8 is displayed on the control unit
7-segment display LED1 (left
side).
E or F is displayed on the control
unit 7-segment display LED1 (left
side).
The WDAL (red) LED on the
control unit lights.
Cause
The SRDY (green) LED on the
control unit is not lit.
The SRDY (green) LED on the
control unit is lit.
search engine
8. Fault Diagnosis and Action
8.2 Fault Examples
Check that the rotary switch CS1 (left side) is set to 0.
Contact the Mitsubishi Service Center.
Contact the Mitsubishi Service Center.
Check the emergency stop conditions.
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.)
III - 50
Remedy
Remedy