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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
23
Excessive speed error
A difference between the speed command and speed feedback was continuously exceeding 50 r/min for longer than the setting
time.
Investigation details Investigation results Remedies SV SP
1
Check the U, V and W wiring connected to the
spindle drive unit.
The wires are not correctly connected. Correctly connect.
◯
The wires are correctly connected. Check the investigation item No. 2.
2
Check the spindle parameter SP020, SP026,
SP027, from SP057 to SP064 and spindle
specification parameters from slimit1 to slimit4
setting value.
The correct values are not set. Correctly set.
◯
The correct values are set. Check the investigation item No. 3.
3
Measure the acceleration/ deceleration time from 0
to the point where the spindle speed reaches its
maximum.
If the alarm occurs when forward run is changed to
reverse run, measure the acceleration/ deceleration
time from the forward to reverse. Also measure it
from the reverse to forward.
12sec or more.
(SP117 setting value or more.)
Increase the spindle acceleration/
deceleration time constant setting
value(sp_t1 to sp_t4).
Reduce the load inertia.
◯
Less than 12sec. Check the investigation item No. 4.
4
Check the load amount when the alarm occurred
during cutting.
The speed deterioration due to load amount
has exceeded the tolerable range which is
determined by the parameter SP096.
-If SP096 is set to 0, it is regarded as 85%.
Thus a speed of 85% of the machining speed
or faster will be the tolerable speed.
Reduce the cutting load to mitigate the speed
deterioration.
Replace the tool.
◯
The load amount is within the SP096 setting
value.
Check the investigation item No. 5.
5
Check the fluctuation of the input voltage into the
power supply unit with a tester.
Voltage drop during acceleration is 200V or
less
Review the power supply capacity.
◯
Voltage drop during acceleration is 200V or
more
Check the investigation item No.6.
6 Check the capacity of the drive unit.
The capacity does not satisfy the motor
output.
Change the capacity to the selected one.
◯
The capacity satisfies the motor output. Replace the unit.
Alarm No.
24
Grounding
The motor power cable is in contact with FG (Frame Ground).
Investigation details Investigation results Remedies SV SP
1
Measure the insulation across the power cables
(U,V,W) for connected motors and the ground.
(Carry out a megger test.)
(Note)
When the insulation is measured, disconnect wires
from the drive unit.
Less than 1MΩ.
The motor or power cable may be ground
faulted.
◯◯
1MΩ or more. Check the investigation item No. 2.
2
Has oil come in contact with the motor or power
cable?
Oil has come in contact.
Take measures so that oil does not come in
contact. Check the motor's cannon connector
and the inside of the terminal box, and clean
as necessary.
◯◯
Oil has not come in contact. Check the investigation item No. 3.
3 Measure the insulation again.
Less than 1MΩ. Replace the motor or cable.
◯◯
1MΩ or more. Check the investigation item No. 4.
4
Measure the resistance across the U, V, W phase
terminals of the servo/spindle drive unit and the
ground with a tester.
(Note) Do not measure the insulation as the unit is
damaged.
Less than 100kΩ. Replace the drive unit.
◯◯
100kΩ or more. Replace the power supply unit.
Alarm No.
25
Absolute position data lost
The absolute position was lost, as the backup battery voltage dropped in the absolute position encoder.
Investigation details Investigation results Remedies SV SP
1 Is warning 9F occurring at the same time?
The warning is occurring. Check the investigation item No. 2.
◯
The warning is not occurring. Check the investigation item No. 3.
2
Measure the battery voltage with a tester at the DC
range.
Less than 3V.
Replace the battery, and establish the zero
point.
◯
3V or more. Check the NC bus cable connection.
3
Did alarm No.18 occur when the power was turned
ON the last time?
Alarm No.18 occurred.
Turn the drive unit control power ON again,
and establish the zero point.
◯
Alarm No.18 did not occur. Check the investigation item No. 4.
4
Was the encoder cable or battery cable left
disconnected from the unit for a long time?
The unit was left disconnected for a long
time.
Guide at delivery: 20 hours or more
After 5 years: 10 hours or more
Turn the drive unit control power ON again,
and establish the zero point.
◯
The cables were not left disconnected. Check the investigation item No. 5.
5
Check the encoder cable or battery cable
connection with a tester.
The connection is faulty. Replace the cable.
◯
The connection is normal. Replace the drive unit.