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MDS-D-SVJ3/SPJ3 Series Instruction Manual
6-3 Troubleshooting
Alarm No.
42
Feedback error 1
An error was detected in the sub side detector (feedback signals of the position detector in a servo system,
or PLG's feedback signals in a spindle system).
Investigation details Investigation results Remedies SV SP
1 Check SP019 and SP020.
Parameter is set incorrectly. Correctly set.
Parameter is set correctly. Check the investigation item No. 2.
2 Check the alarm No. "2C" items.
Alarm No.
43
Feedback error 2
Excessive difference was detected in position data between the motor side detector and the machine side
detector.
Investigation details Investigation results Remedies SV SP
1
Check if the connecting pulley ratio of
the spindle end to ABZ pulse encoder
meets the machine specifications.
The pulley ratio of the spindle end to
encoder is 1:1.
Check the parameter setting.
The spindle end and encoder are not
equal in the pulley ratio.
Check the parameter setting.
When the encoder is smaller than the
spindle end in the pulley ratio, replace
the pulley.
No problem. Check the investigation item No. 2.
2
Check the setting value of the spindle
parameter from SP057 to SP064.
The correct values are not set. Correctly set.
The correct values are set. Check the investigation item No. 3.
3
Check the spindle parameter SP054
setting value.
V-belt is used for the spindle end driv-
ing.
Set "-1" to the spindle parameter
"SP054".
Other than V-belt (gears or timing belt)
is used for the spindle end driving.
Set "360" to the spindle parameter
"SP054".
SP054 is set corresponding to the ma-
chine specifications.
Check the investigation item No. 4.
4
Jiggle the detector connectors (drive
unit side and detector side) and check
if they are disconnected.
The connector is disconnected (or
loose).
Correctly install.
The connector is not disconnected. Check the investigation item No. 5.
5
Is the detector cable wired in the same
conduit as the motor's power cable, or
are the two cables laid in parallel near
each other?
The cables are wired near each other.
Noise is entering from the power ca-
ble.
Improve the cable wiring.
Divide it by a FG shield.
The wires are sufficiently separated. Check the investigation item No. 6.
6
Is the motor FG wire connected only to
the drive unit which drives it?
(Is the motor grounded to one point?)
The motor FG wire is grounded on the
motor side.
Ground the motor to one point, con-
necting the wires together on the drive
unit side.
The motor is grounded to one point. Check the investigation item No. 7.
7
Turn the power OFF, and check the
detector cable connection with a tes-
ter. (Is the cable shielded?)
The connection is faulty. Replace the detector cable.
The connection is normal. Check the investigation item No. 8.
8
Replace with another unit, and check
whether the fault is on the unit side or
detector side.
The alarm is on the drive unit side. Replace the drive unit.
The alarm is on the detector side. Check the investigation item No. 9.
9
Check if there is any abnormality in the
detector's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Take remedies according to the causes of the abnormality in the ambient en-
vironment.
10
Check SP019, SP020, SV019, and
SV020.
Parameter is set incorrectly. Correctly set.
Parameter is set correctly. Check the investigation item No. 11.
11 Check the alarm No. "1B" items.