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8. TROUBLESHOOTING
MELSEC-A
8.2.3
incorrect posltioning
r
Check whether the positioning control
mode i s the speed/positioning control
switching
e.
I
Is
it
the positioning
YES
trol switching signal and switch control
from velocity control to positioning con-
trol.
Is the time required
for
control
switching
wit
in the
Normal
Check whether the positioning error
(error amount and error occurring posi-
tion) is random or regular.
Check the set data and
machine position; correct if
necessary.
YES
Check
the
backlash compensa-
tion value; correct if necessary.
tion value and error compensa-
Check the parameters and
positioning d a t a ; correct if
necessary.
Execute the test operation (positioning)
using a peripheral device or AD71TU.
YES
Check
the
data number and
ad-
Check the current value.
Check the stop signal.
Check for sources of noise (welder,
power supply, etc.)
b
8-11
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