Troubleshooting; Troubleshooting At Power On - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual

7 Troubleshooting

7.3 Troubleshooting
Follow this section to troubleshoot the alarms that occur during start up or while the machine is operating. If the state is
not improved with the following investigations, the drive unit may be faulty. Exchange the unit with another unit of the
same capacity, and check whether the state is improved.

7.3.1 Troubleshooting at Power ON

If the NC system does not start up correctly and a system error occurs when the NC power is turned ON, the drive unit
may not have been started up properly. Check the LED display on the drive unit, and take measures according to this
section.
LED
Symptom
display
Initial communication with the
AA CNC was not completed
correctly.
Initial communication with the
Ab
CNC was not carried out.
An error was detected in the
12 unit's memory and IC during the
self-diagnosis at power ON.
The drive unit has started up normally if the following type of emergency stop (E7) is displayed on the display unit's LED
display.
F+axis No.
Cause of occurrence
The drive unit axis No. setting is
incorrect.
The CNC setting is incorrect.
Communication with CNC is
incorrect.
The axis is not used, the setting is
for use inhibiting.
Communication with CNC is
incorrect.
The CPU peripheral circuit is
abnormal.
F1 E7
Emergency stop
Normal drive unit LED display at NC power ON (for 1st axis)
Investigation method
Is there any other drive unit that has the same
axis No. set?
Is the No. of CNC controlled axes correct?
Is the connector (CN1A, CN1B) connected?
Is the cable broken?
Is the DIP switch set correctly?
Is the connector (CN1A, CN1B) connected?
Is the cable broken?
Check the repeatability.
Check whether there is any abnormality with
the unit's surrounding environment, etc.
F2 E7
F+axis No. Emergency stop
387
Remedy
Set correctly.
Set correctly.
Connect correctly.
Replace the cable.
Set correctly.
Connect correctly.
Replace the cable.
Replace the unit.
Improve the
surrounding
environment.
Not lit
IB-1501229-F