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9.2.6. Dead Band Setting : DBP
l
Dead band is set in position deviation of position loop. The system disregards the position deviation
when it is under the set value of DBP.
l
It requires the password for setting. The shipping set is DBP0.
l
In some application micro-vibration at the end of positioning is observed due to small position
deviation. The dead band is to reduce the micro-vibrations.
l
The dead band improves in occurrence of the micro-vibrations, however it worsens positioning
repeatability for the value of DBP setting.
l
The dead band is centered at “0” to position error and the position deviation under the value of dead
band is disregarded. Thus it makes position command to “0.”
l
Unit of DBP is the pulse. (equivalent to the resolver resolution in 12-bit specification) If the rsolver
resolution is 10-bit specification, set the DBP value in multiples of 4. Refer to “4.2.3. Functional
Specifications” for resolution of the resolver.
Figure 9-32: Dead Band Setting Block Diagram
Velocity data
+
–
Position
command
Position loop
dead band
Position data
Velocity loop
integrator
Velocity
loop gain
Position
loop gain
+
–
VI
VG
PG
DBP
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