Omron G5 Series User Manual page 286

6 Applied Functions
Precautions for Correct Use Precautions for Correct Use
• Stop operation before changing the parameters or switching with DFSEL.
• Damping control may not function properly or have a poor effect under the following
conditions.
Item
Control mode
Load condition
Operating Procedure
1
Adjust the position loop gain and the speed loop gain.
Adjust Position Loop Gain (Pn100), Speed Loop Gain (Pn101), Speed Loop Integral Time
Constant (Pn102), and Torque Command Filter Time Constant (Pn104).
If no problem occurs in realtime autotuning, you can continue to use the settings.
2
Measure the damping frequency at the tip of the mechanical unit.
Measure the damping frequency by using a measurement device such as a laser displacement
sensor, servo acceleration meter, or acceleration pick-up.
Set the measured damping frequency in one of Damping Frequency 1 to Damping Frequency 4
(1: Pn214, 2: Pn216, 3: Pn218, 4: Pn220) according to the operation.
Also set the Switching Mode using Damping Filter Selection (Pn213).
If the measurement device cannot be used, use CX-Drive tracing function, and read the residual
damping frequency [Hz] from the position error waveform as shown in the following figure.
Command
speed
If vibration persists after setting the frequency, increase or decrease the resonance frequency to
find a proper frequency at which vibration decreases.
6 - 4
Conditions that interfere with the effect of damping control
• Speed control mode
• If forces other than position commands, such as external forces, cause vibration
• If the damping frequency is outside the range of 1 to 200 Hz
• If the ratio of the resonance frequency to anti-resonance frequency is large
• The damping frequency in the figure is calculated
Position error
Calculate the
damping frequency.
Damping cycle T
• Application example
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User's Manual
with the following formula:
1
f [Hz]
T [s]
Since the parameter unit is 0.1 Hz:
(Pn214, Pn216, Pn218, Pn220) = 10 x f
If the damping cycle is 100 ms or 20 ms, set 100
or 500 in the parameter so that the damping
frequency becomes 10 Hz or 50 Hz.