Mitsubishi Electric C70 Setup Manual page 335

MITSUBISHI CNC
Appendix 1 Explanation of Parameters
【#13072】 SP072 DIQN Variable current limit during deceleration, break point speed
Set this parameter to adjust the deceleration time by changing the current limit value during
deceleration depending on the motor speed.
As shown below, set the lower limit rate of the current limit in SP071 (DIQM), and use with SP072
(DIQN).
When DIQM is set to 100%, the standard current limit value in deceleration (TMLR) is applied.
100%
(TMLR)
DIQM
---Setting range---
1 to 32767 (r/min)
【#13073】 SP073 VGVN Variable speed gain target value
If noise is bothersome during high speed rotation, it may be reduced by lowering the speed loop gain
at high speed.
Set this value to ensure the adequate response by suppressing noise and vibration at low speeds
and increasing the speed loop gain at high speeds for a high-speed spindle of machining center, etc.
As shown below, set the speed loop gain rate for the overspeed detection speed in SP073 (VGVN),
and use with SP074 (VGVS).
When not using, set to "0".
The overspeed detection speed (VLMT) is 115% of the maximum motor speed (TSP).
This function can be used when either Speed loop gain set 1 or Speed loop gain set 2 is selected.
VGVN
(SP073)
<100
---Setting range---
0 to 999 (%)
318
0
DIQN Motor speed
Scale[%]
100
VGVS VLMT
(SP074) (SP026 1.15)
When lowering the speed loop gain at high speed
Scale[%]
VGVN
(SP073)
>100
100
Motor speed
[r/min]
VGVS
(SP074)
When increasing the speed loop gain at high speed
Motor speed
[r/min]
VLMT
(SP026 1.15)