sh030051g.pdf - 第166页
7 - 9 7. SPECIAL ADJUSTMENT FUNCTIONS POINT When machine end vibration do es not show up in motor end vibration, the setting of the motor end vibration frequency does not produce an effect. When the anti-resonan ce frequ…
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7. SPECIAL ADJUSTMENT FUNCTIONS
(4) Vibration suppression control manual mode
Measure work end vibration and device shake with the machine analyzer or external measuring instrument,
and set the vibration suppression control vibration frequency (parameter No.PB19) and vibration
suppression control resonance frequency (parameter No.PB20) to set vibration suppression control
manually.
(a) When a vibration peak can be confirmed using MR Configurator, machine analyzer or external FFT
equipment
1Hz
-90deg.
100Hz
Gain characteristic
Phase
Vibration suppression control
vibration frequency
(Anti-resonance frequency)
Parameter No.PB19
Vibration suppression
control resonance
frequency
Parameter No.PB20
Resonance of more
than 100Hz is not the
target of control.
(b) When vibration can be confirmed using monitor signal or external sensor
t t
Motor end vibration
(Droop pulses)
Position command frequency
Vibration cycle [Hz]
Vibration suppression control
vibration frequency
Vibration suppression control
resonance frequency
Set the same value.
External acceleration pick signal, etc.
Vibration cycle [Hz]
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7. SPECIAL ADJUSTMENT FUNCTIONS
POINT
When machine end vibration does not show up in motor end vibration, the
setting of the motor end vibration frequency does not produce an effect.
When the anti-resonance frequency and resonance frequency can be
confirmed using the machine analyzer or external FFT device, do not set the
same value but set different values to improve the vibration suppression
performance.
A vibration suppression control effect is not produced if the relationship
between the model loop gain (parameter No.PB07) value and vibration
frequency is as indicated below. Make setting after decreasing PG1, e.g.
reduce the response setting.
2
1
(1.5 PG1) vibration frequency
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7. SPECIAL ADJUSTMENT FUNCTIONS
7.5 Low-pass filter
(1) Function
When a ball screw or the like is used, resonance of high frequency may occur as the response level of the
servo system is increased. To prevent this, the low-pass filter is factory-set to be valid for a torque
command. The filter frequency of this low-pass filter is automatically adjusted to the value in the following
expression.
Filter frequency(rad/s)
1 + GD2
VG2
10
When parameter No.PB23 is set to "
1 ", manual setting can be made with parameter No.PB18.
(2) Parameter
Set the operation of the low-pass filter selection (parameter No.PB23.)
Parameter No.PB23
Low-pass filter selection
0: Automatic setting (initial value)
1: Manual setting (parameter No.PB18 setting)
7.6 Gain changing function
This function can change the gains. You can change between gains during rotation and gains during stop or
can use an input device to change gains during operation.
7.6.1 Applications
This function is used when.
(1) You want to increase the gains during servo lock but decrease the gains to reduce noise during rotation.
(2) You want to increase the gains during settling to shorten the stop settling time.
(3) You want to change the gains using an input device to ensure stability of the servo system since the load
inertia moment ratio varies greatly during a stop (e.g. a large load is mounted on a carrier).