Led Display Functions - Mitsubishi Electric MELSEC-QD75MH1 User Manual

15 TROUBLESHOOTING

15.4 LED display functions

Details of indication
Goes OFF
Goes ON
Flashes
RUN AX1
AX2
Extinguishment of
AX3
RUN LED
ERR AX4
RUN AX1
Lighting of RUN LED,
AX2
Extinguishment of
AX3
ERR LED
ERR AX4
RUN AX1
AX2
Lighting of ERR LED System error
AX3
ERR AX4
RUN AX1
AX2
Extinguishment of
AX3
AX1 to AX4 LEDs
ERR AX4
RUN AX1
Lighting of AX1
AX2
(Same even if the
AX3
other axis is lit)
ERR AX4
RUN AX1
Flashing of ERR LED
AX2
Flashing of AX1 LED
AX3
(Same even if the
ERR AX4 other axis flashes)
RUN AX1
AX2
Lighting of all LEDs
AX3
ERR AX4
The states of QD75MH and each axis control can be confirmed by the LEDs located
on the front panel of the QD75MH main unit.
QD75MH4
RUN
ERR
Each axis can be monitored by the states of the LEDs.
The operation and indications of the LEDs are as shown below.
Points to be
confirmed
The hardware is
faulty or watch dog
timer error occurs.
The module is
normal.
During axis stop,
during axis standby
During axis
operation
Axis error
The hardware is
faulty
AX1
AX2
AX3
AX4
Error
If the RUN LED does not light up even when the
power is turned ON, the module may be out of order.
Replace the module with a new one.
An operation condition setting error or installation PLC
CPU type error occurs.
(The setting and PLC CPU type are outside the
specification range.) Set the PLC CPU type to a one
contained in the specification.
This lights up from the positioning start until the
positioning is completed, stopped temporarily, or
stopped by error (corresponding at a ratio of 1 : 1 to
BUSY signals).
Check the error observed on the buffer memory batch
processing monitor of a peripheral device and correct
the applicable parameters and positioning data.
The module comes out of order. Replace the module
with a new one.
15 - 60
MELSEC-Q
Remedy
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