YASKAWA SGD7S series Product Manual page 210

Problem Possible Cause
Noise interference occurred
because of incorrect I/O sig-
nal cable specifications.
Position
Deviation
Noise interference occurred
(without
because an I/O signal cable
Alarm)
is too long.
An encoder fault occurred.
(The pulse count does not
change.)
A failure occurred in the SER-
VOPACK.
The surrounding air tempera-
ture is too high.
The surface of the Servomo-
tor is dirty.
Servomotor
There is an overload on the
Overheated
Servomotor.
Polarity detection was not
performed correctly.
Clearance control is disabled
with the Clearance Control
Selection Switch (Pn6E8 =

n. 0).
Clearance
CLC_OFS (offset reference)
control is
in the CLC_CTRL (Clearance
not
Control) command is 0.
executed.
Pn6F2 (Maximum Clearance
Offset) is 0.
Pn6F4 (Minimum Clearance
Offset) is 0.
*
Refer to the following manual for details.
Σ Σ
-7-Series -7S SERVOPACK with MECHATROLINK-III Communications References Product Manual (Manual No.: SIEP
S800001 28)
9.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
Check the I/O signal
cables to see if they sat-
isfy specifications. Use
shielded twisted-pair
cables or screened
twisted-pair cables with
conductors of at least
2
0.12 mm (stranded wire).
Check the lengths of the
I/O signal cables.
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–
Measure the surrounding
air temperature around
the Servomotor.
Visually check the surface
for dirt.
Check the load status
with a monitor.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
The Clearance Control
Selection Switch is set to
disable clearance control

(Pn6E8 = n.
Check CLC_OFS (offset
reference) in CLC_CTRL.
Check Pn6F2 (Maximum
Clearance Offset).
Check Pn6F4 (Minimum
Clearance Offset).
Continued from previous page.
Correction
Use cables that satisfy
the specifications.
The I/O signal cables
must be no longer than
3 m.
Replace the Servomo-
tor or linear encoder.
Replace the SERVO-
PACK.
Reduce the surround-
ing air temperature to
40°C or less.
Clean dirt, dust, and oil
from the surface.
If the Servomotor is
overloaded, reduce the
load or replace the
Servo Drive with a
SERVOPACK and Ser-
vomotor with larger
capacities.
Correct the settings for
the polarity detection-
related parameters.
Set the Clearance Con-
trol Selection Switch to
enable clearance con-

X). trol (Pn6E8 = n.
Set CLC_OFS (offset
reference) to the value
of the offset.
Set Pn6F2 (Maximum
Clearance Offset).
Set Pn6F4 (Minimum
Clearance Offset).
Reference
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1).
page 4-6
page 4-7
page 4-7
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