
3. PERIPHERAL EQUIPMENT CONTROL
B--65245EN/02
HANDLING
84
As a larger value is set in this parameter, the response to a velocity
command improves, and servo rigidity increases. If an excessively large
value is set, however, the servo system vibrates, and an unusual sound is
generated during machine movement. Usually, set a value not exceeding
500. If the machine vibrates at a high frequency, the use of the torque
command filter of parameter No. 102 is effective.
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116 Velocity loop gain override during speed control (%)
Size : 2 bytes
Standard value : 0 (Override processing is not performed.)
Set this parameter when switching between position control and speed
control. When the speed control mode is set, an override specified here
is applied to the velocity loop gain and integration gain used for position
control.
The relationships among a velocity loop proportional gain, integration
gain, load inertia ratio, and velocity loop gain override in speed control
are explained below using an example. Assume the following:
Integration gain = 100
Proportional gain = --500
Load inertia ratio = 128
Velocity loop gain override in speed control = 200%
[Gain in position control]
Integration gain = 100 × (1 + 128/256) = 150
Proportional gain = --500 × (1 + 128/256) = --750
[Gain in speed control]
Integration gain = 100 × (1 + 128/256) × 200/100 = 300
Proportional gain = --500 × (1 + 128/256) × 200/100 = --1500
Thus, when speed control is exercised, a gain override is applied to a gain
that takes a load inertia ratio into consideration.
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135 Linear acceleration/deceleration time constant for speed control
Size : 2 bytes
Unit of data :ms
Valid data range : 8 to 4000
Specify a time required until 4000 rpm is reached.
Example: When a speed command value of 2000 rpm is specified, and
the time required until 2000 rpm is reached needs to be 1000
ms, the value to be set in this parameter is calculated as
follows:
Setting = (4000/2000) × 1000 = 2000
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136 Speed deviation check limit value in speed control
Size : 2 bytes
Unit of data :rpm
Valid data range : 0 to 4000
Standard setting : 0 (No speed deviation check is made.)