
4.SERVO FUNCTION DETAILS B-65270EN/05
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<1> Cutting/rapid velocity loop gain switching function
When TCMD is saturated during acceleration in rapid traverse,
oscillation is easily generated in the velocity loop at the end of
acceleration in rapid traverse. In some machines, as the feedrate
becomes higher, high-frequency oscillation easily occurs. In such
cases, switching between the gain for cutting feed and the gain
for rapid traverse is effective.
If the cutting/rapid velocity loop gain switching is set, the
conventional velocity gain is used in rapid traverse, and the
overridden value is used during cutting feed. The override value
is usually set to about 150% to 200%. When vibration occurs
only in the stopped state, use the variable proportional gain
function in the stop state. (With Series 90D0, 90E0, 90B0, 90B1,
90B6, and 90B5, the variable proportional gain function in the
stop state and the velocity loop high cycle management function
can be used together.)
When servo HRV3 control or HRV4 control is used, a separate
override value can be specified during high-speed HRV current
control. See Section 4.2, "HIGH-SPEED HRV CURRENT
CONTROL".
#7 #6 #5 #4 #3 #2 #1 #0
1742 (FS15i)
VGCCR
2202 (FS30i,16i)
1: Enables the cutting/rapid velocity loop gain switching function.
0: Disables the cutting/rapid velocity loop gain switching function.
1700 (FS15i)
Override value at cutting (%)
2107 (FS30i,16i)
[Valid data range] 50 to 400
[Series30i, 16i, and so on]
Cutting/rapid velocity loop gain
switching function
Velocity loop gain [%]
No. 2202#1=0 (disabled) Always (1 + No. 2021 / 256) × 100
Rapid traverse (1 + No. 2021 / 256) × 100
No. 2202#1=1 (enabled)
Cutting feed
(1 + No. 2021 / 256) × No. 2107
[Series15i]
Cutting/rapid velocity loop gain
switching function
Velocity loop gain [%]
No. 1742#1=0 (disabled) Always (1 + No. 1875 / 256) × 100
Rapid traverse (1 + No. 1875 / 256) × 100
No. 1742#1=1 (enabled)
Cutting feed
(1 + No. 1875 / 256) × No. 1700