Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 164

(26) Warning No.
[Details] The value of the current flowing to the spindle motor exceeded the overload detection
level (spindle parameter SP064: OLL), and continued longer than 80% of the overload
detection time (spindle parameter SP063: OLT).
Investigation items
1 Investigate as in alarm
No. 50 , and carry
out the appropriate
measures.
(27) Warning No.
[Details] A value was set during ready ON that exceeded the allowable range.
Investigation items
1 Investigate as in alarm
No. 37 , and carry
out the appropriate
measures.
(28) Warning No.
[Details] This warning occurs when an emergency stop signal is input from the NC, or when an
alarm occurs in another servo axis or spindle.
Investigation items
1 Check whether the
emergency stop switch
is ON.
2 Jiggle the connector
between the NC and
spindle drive unit to
see whether it is
coming loose. Also
check if there is any
excessive force being
applied to the
connectors.
3 Disconnect the cable
between the NC and
spindle drive unit, and
check the connection
with a tester.
4 Investigate the wiring
and installation
environment.
1) Are the units
correctly grounded?
2) Are there any
devices that
produce noise
around the units?
11. Troubleshooting
E1 : OVERLOAD WARNING
Investigation results
E4 : PARAMETER ERROR WARNING
Investigation results
E7 : NC EMERGENCY STOP
Investigation results
The switch is ON.
The switch is OFF.
Connector came (was coming) loose.
Excessive force was applied.
No particular problem.
There was a connection fault.
There was no connection fault.
1) The grounding is incomplete.
2) The alarm occurs easily when a
specific device is operated.
No particular problem.
11 − 20
Remedy
Remedy
Remedy
Turn the emergency stop button
OFF.
Investigate item 2, and carry out the
appropriate measures.
Install correctly.
Investigate item 3, and carry out the
appropriate measures.
Replace the cable.
Investigate item 4, and carry out the
appropriate measures.
Correctly ground the units.
Execute noise countermeasures for
the device at the left.
Replace the spindle drive unit.