Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 151

(6) Alarm No.
[Details] The error between the speed command and the current speed exceeded 50rpm for 12
seconds.
Investigation items
1 Check the U, V, W
wiring between the
spindle drive unit and
motor.
2 Check the spindle
parameter (SP034,
SP040, SP055, SP257
and after) setting
values.
3 Measure the
acceleration/decelerati
on time to the max.
spindle speed. If the
alarm occurs when
changing from forward
run to reverse run or
vice versa, measure
the acceleration/
deceleration time from
the max. forward run
speed to the max.
reverse run speed (or
vice versa).
4 If the alarm occurs
during cutting, check
the load amount.
5 Jiggle the speed
detector connector
(spindle drive unit side
and speed detector
side) to see whether it
is coming loose.
6 Turn the power OFF,
and check the speed
detector cable
connection with a
tester.
11. Troubleshooting
23 : EXCESSIVE SPEED ERROR
Investigation results
The wiring is not connected correctly. Wire correctly.
The wiring is connected correctly.
The correct value is not set.
The correct value is set.
Acceleration/deceleration takes 12
sec. or more.
Acceleration/deceleration takes 12
sec. or less.
The load amount is 120% or more.
The load amount is 119% or less.
Connector came (was coming) loose. Install correctly.
Connector did not come (was not
coming) loose.
The connection is faulty, or there is a
broken wire.
The connection is normal.
Investigate item 2, and carry out the
appropriate measures.
Set the correct value.
Investigate item 3, and carry out the
appropriate measures.
Increase the spindle parameter
(SPO55) setting value.
Investigate item 4, and carry out the
appropriate measures.
Decrease the load amount.
Investigate item 5, and carry out the
appropriate measures.
Investigate item 6, and carry out the
appropriate measures.
Replace the detector cable. Correctly
connect the cable.
Replace the spindle drive unit.
11 − 7
Remedy