2-10
2-10
Moving Distance is Insufficient/Excessive.
Rotation Speed is Too Slow/Fast.
·
Actual moving distance and rotation speed are different from specified moving distance and rotation
speed.
Probable cause
Item to check
Countermeasure
Pulse rate setting mistake.
·
The pulse rate set value is differ-
ent from the actual pulse rate.
·
Set the pulse rate correctly.
Note 1.
The pulse rate is the movement distance of the machine system per motor pulse.
Note 2.
Be sure to check the following set values when a digital Servo Driver is applied.
Actual movement distance or rotation speed will not coincide with the specified movement
distance or rotation speed if the set values are incorrect.
U Series:
Electronic gear ratios (G1 and G2), encoder dividing ratio setting, and command
pulse mode
H Series:
Electronic gear multiplication ratios (G1 and G2) and encoder output specifica-
tion
M Series:
Resolver segment number (G1 and G2)
Position Deviation Occurs Gradually if the Unit is Operated Repeatedly.
The Position Determined Changes Slightly.
·
Position deviation is not large but still varies with the operating speed of the Position Control Unit.
Probable cause
Item to check
Countermeasure
A joint of the machine system
deviates.
·
A joint of the machine system
(especially a section where parts
are connected with friction) devi-
ates.
*Such a section can be easily found
by marking it.
·
Increase the joint strength.
The pulse frequency is too high
and the pulse cannot be read
correctly.
·
The command pulse frequency
output from the Position Control
Unit exceeds the response fre-
quency of the Servo Driver with
pulse-train input.
·
Decrease the command speed.
·
Decrease the pulse frequency
and adjust with the electronic
gear (for U, H, and M Series)
·
The encoder signal frequency
that is output from the Servo
Driver with analog input exceeds
the response frequency of the
Position Control Unit (see note).
·
Decrease the command speed.
·
Decrease the number of output
pulses (for U, H, and M Series)
Position deviation due to noise.
·
The command pulse output from
the Position Control Unit is af-
fected by noise.
·
The encoder signal output from
the Servo Driver is affected by
noise.
·
Take countermeasures against
noise. Refer to
Chapter 4 Coun-
termeasures Against Noise
.
Note
The output phase error of the Servo Driver must be taken into consideration when calculating the
pulse frequency. For details on the output phase error, refer to the Operation Manual of the Servo
Driver in use.
Connection to Position Control Unit
Chapter 2
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