6. Troubleshooting
6 - 38
Alarm No.
8B
Encoder converter unit 2, automatic adjustment error
An abnormal signal from the PLG was detected during automatic adjustment of the PLG.
Investigation details Investigation results Remedies SV SP
The connector is disconnected (or
loose).
Correctly install. 1 Check whether the MDS-B-PJEX
connectors (CN5) or detector
connectors are disconnected.
The connector is not disconnected. Investigate item 2.
{
There is a connection fault. Replace the detector cable. 2 Turn the power OFF, and check the
detector cable connection with a
tester.
The connection is normal. Investigate item 3.
{
There is a problem. (The A/B phase
input voltage is 0.8V or less or 2.2V
or higher.)
Adjust the PLG output waveform. 3 Check the PLG output waveform (A/B
phase).
Normal Investigate item 4.
{
Occurs each time. Replace the MDS-B-PJEX unit. 4 Check the occurrence frequency.
Occurs occasionally. Check whether the cable is
disconnected, whether there is a
contact fault, or a detector fault.
{
Alarm No.
8C
Encoder converter unit 2, judgment error
A detector type outside the specifications was detected with the MDS-B-PJEX.
Investigation details Investigation results Remedies SV SP
The setting was incorrect.
"4" : 128 pulses
"5" : 256 pulses
"6" : 512 pulses
"8" : 180 pulses
Set correctly according to the No. of
PLG gear teeth.
1 Check the spindle parameter SP042.
SP042: C-axis control detector range.
(Spindle end PLG No. of pulse
setting)
The setting is correct. Investigate item 2.
{
No abnormality is found in particular. Replace the MDS-B-PJEX. 2 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
Alarm No.
8D
Detection converter unit 2, CPU error
With the servo, a CPU error was detected with the MDS-B-HR unit. With the spindle, a CPU error was
detected with the MDS-B-PJEX unit.
Investigation details Investigation results Remedies SV SP
No abnormality is found in particular. Replace the detection converter unit.1 Check if there is any abnormality in
the detector's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{ {
Alarm No.
8E
Detection converter unit 2, data error
A data error was detected with the MDS-B-HR unit.
Investigation details Investigation results Remedies SV SP
The cable is broken. Replace the cable. 1 Check whether the cable between
the linear scale and MDS-B-HR is
broken.
The cable is not broken. Investigate item 2.
{
No abnormality is found in particular. Investigate item 3. 2 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
The state is improved. Replace the MDS-B-HR unit. 3 Try replacing the MDS-B-HR unit.
The state is not improved. Replace the linear scale.
{
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