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MDS-D-SVJ3/SPJ3 Series Instruction Manual
6-3 Troubleshooting
Alarm No.
3A
Overcurrent
Excessive current was detected in the motor drive current.
Investigation details Investigation results Remedies SV SP
1
[1] Check whether vibration is occur-
ring at the table or spindle.
[2] Check if the vibration caused by the
load fluctuation is occurring.
Vibration is occurring.
[1] Set a filter.
[2] Lower the speed loop gain (SV005/
SP005).
There is no vibration. Check the investigation item No. 2.
2
Check the repeatability of the alarm at
the rapid traverse feed for the servo
and at acceleration/deceleration for
the spindle.
(Note) Check the phenomenon
caused by the load fluctuation.
The alarm occurs.
Lower the speed loop gain (SV005/
SP005) to the level at which the alarm
does not occur.
The alarm does not occur. Check the investigation item No. 3.
3
For the servo, perform the rapid tra-
verse feed repeatedly and check if the
max. current value is within the tolera-
ble value.
For the spindle, check the load meter
value at the unloaded max. rotation
speed.
The displayed value is high.
Increase the current loop gain.
Servo: SV009 to 012
Spindle: SP077 to 080 and SP081 to
084
The displayed value is appropriate. Check the investigation item No. 4.
4
Disconnect the power cable (U,V,W)
from the terminal block and the can-
non plug from the motor. Check the in-
sulation of the cable and motor with a
tester.
The resistance value of the power ca-
ble for each phase is not "∞".
Replace the motor power cable.
The resistance value of the motor ter-
minal and unit (shaft) is 1M or less.
Replace the motor.(Note) For the mo-
tors equipped with the absolute posi-
tion detector, the zero point must be
established.
The values below are met when mea-
sured with a tester.
Cable: ∞
Motor terminal - unit:1M or more
Check the investigation item No. 5.
5
Check the insulation between the mo-
tor power cable and FG.
There is a ground fault at the power
cable.
Replace the motor power cable.
There is no problem. Check the investigation item No. 6.
6
Check if there is any abnormality in the
motor's ambient environment.
(Ex. Ambient temperature, cutting wa-
ter)
Take remedies according to the causes of the abnormality in the ambient en-
vironment.
Alarm No.
3B
Power module overheat
Thermal protection function in the power module has started its operation.
Investigation details Investigation results Remedies SV SP
1
Check that the fan of the drive unit is
rotating correctly.
Large amounts of cutting oil or cutting
chips, etc., are adhered to the fan, or
the rotation is slow.
Clean or replace the fan.
The fan is rotating properly. Check the investigation item No. 2.
2
Check whether the heat dissipating
fins are dirty.
Cutting oil or cutting chips, etc., are
adhered, and the fins are clogged.
Clean the fins.
Cutting chips etc. are not adhered to
the fins.
Check the investigation item No. 3.
3
Measure the drive unit's ambient tem-
perature.
55°C or more.
Improve the efficiency cooling for the
power distribution panel.
Less than 55°C. Check the investigation item No. 4.
4
Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Take remedies according to the causes of the abnormality in the ambient en-
vironment.