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6 Troubleshooting
MITSUBISHI CNC
Alarm No.
1F
Sub side detector: Communication error
An error was detected in communication data with the linear scale or the ball screw side detector. Or the
communication was interrupted.
Investigation details Investigation results Remedies SV SP
1
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. 2.
2
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.)
Wire the detector cable away from the
power cable.
Shield the power cable.
The wires are sufficiently separated. Check the investigation item No. 3.
3
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. 4.
4
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. 5.
5
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. 6.
6
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.
Alarm No.
21
Sub side detector: No signal2
When an excessive error alarm occurred, no signal from the machine side detector was detected.
An error was detected in the ABZ-phase in the full closed loop control system.
Investigation details Investigation results Remedies SV SP
1
Check the servo parameter (SV025.
pen:machine end detector), and spin-
dle parameter (SP019) setting value.
Are the pulse type detector parame-
ters set for a serial communication
type detector?
The value is not set correctly.
Correctly set SV025.pen for the servo
and SP019 for the spindle (including
SP097 for pulse type).
The value is set correctly. Check the investigation item No. 3.
2
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. 4.
3
Turn the power OFF, and check the
detector cable connection with a tes-
ter.
The connection is faulty. Replace the detector cable.
The connection is normal. Check the investigation item No. 5.
4
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. Replace the detector.
5
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.
Alarm No.
22
Detector data error:
Drive unit received a wrong feedback data (scattered data) from the detector and position deviation
occurred.
Investigation details Investigation results Remedies SV SP
1
Check if the installation of the detector
is loosened.
It is loosened. Tightly install the detector.
It is not loosened. Check the investigation item No. 2.
2
Check if an excessive vibration is oc-
curring during machining.
An excessive vibration is occurring. Check the installation of the machine.
An excessive vibration is not occur-
ring.
Check the investigation item No. 3.
3 Check the investigation item No.2 or subsequent items in Alarm No.21.