
B-65150E/04 3. α SERIES PARAMETER ADJUSTMENT
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3.3.3 Vibration during Travel
Vibration is generated during travel by various causes. So, a most
appropriate method must be selected after observing the vibration
status carefully.
Vibration occurs especially
during acceleration/
deceleration.
<1> Is an auxiliary function set to increase the oscillation limit for the velocity loop gain?
Machine with high rigidity: Velocity loop proportional high-speed processing function
Machine with low rigidity: Acceleration feedback function
<2> Vibration frequency?
Low frequency
<3> Velocity loop oscillates. Is an auxiliary
function used to suppress vibration?
TCMD filter (function 1)
Several tens of
hertz or higher
<4> Is the standard value set for the current loop
gain?
<8> Response to vibration components from
the command side. Decrease the velocity
feed-forward coefficient (200 or less).
<9> Set 16 ms for the fine acceleration/
deceleration function. (Function 5)
<11> The position gain may be too large for the set
velocity loop gain. When the velocity loop
gain is not yet adjusted, follow the description
in Subsec. 3.3.1 to set the velocity loop gain to
70% of the oscillation limit.
<12> For PI control, are effective results produced
by decreasing the velocity loop integral gain by
about 2/3?
<13> Decrease the position gain.
<6> Vibration may be due to machine torsion. Is an
auxiliary function used to suppress vibration?
Dual position feedback (function 2)
Vibration-damping control (function 3)
Machine velocity feedback (function 4)
TCMD filter (function 1)
About several tens Hertz
with separate detector
<7> Decrease the position gain.
Use of I-P control may produce effective results. After
checking for a figure error during high-speed cutting,
decrease the position gain, or set I-P control.
<5> Decrease the velocity loop gain.