−
76
−
Category
Wiring
Causes
Velocity commands contain
noises.
Improper offset
Velocity commands contain
noises.
Countermeasures
Use shielded cables for connection to CN I/F. Power
and signal cables should be separated by at least
30 cm and put in duct.
Measure the voltage between CN I/F pins 14 and
15 (velocity command inputs) using a circuit tester
and/or oscilloscope. Adjust the value of Pr52 so that
the motor can stop.
Use shielded cables for connection to CN I/F. Power
and signal cables should be separated by at least
30 cm and put in duct.
Positioning accuracy is bad.
Category
System
Adjustment
Parameter
Causes
Position commands (amount of
command pulses) are not cor-
rect.
Reading of in-position signals
occurs at the edge.
The form and width of the com-
mand pulses deviate from the
specified values.
The position loop gain is too
small.
The setting of in-position detec-
tion range (Pr60) is too large.
The command pulse frequency
exceeds 500 kpps.
The scale is not appropriate.
Countermeasures
Count the number of feedback pulses while repeat-
ing to travel back and forth within a fixed distance.
If the number of feedback pulses varies, adjust the
controller. Take measures to reduce the noise on
the command pulse.
Use the check pin (IM), to monitor the position error
when the in-position signals are received. Read the
in- position signals at a mid point on the time span,
not at the edge.
If the command pulses are deformed or narrowed,
adjust the pulse generation circuit. Take measures
to reduce the noise on the command pulse.
Check the amount of position error in the monitor
mode. Increase the value of Pr10 to the extent that
no oscillation occurs.
Decease the value of Pr60 (in-position range) to the
extent that the in-position signals do not chatter.
Decrease the command pulse frequency. Change the
values of Pr46 through Pr4B (numerator of 1st to
4th command scale).
Check the repetition accuracy. If repeated without
fluctuation, increase the capacity of the motor and
driver.
Troubleshooting
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com