Mitsubishi Electric C70 Setup Manual page 336

【#13074】 SP074 VGVS Variable speed gain change start speed
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 32767 (r/min)
【#13075】 SP075 DWSH Slip compensation scale during regeneration high-speed coil
Set the slip frequency scale during deceleration.
Normally, set to "0". (For machine tool builder adjustment)
---Setting range---
0 to 255 (1/16-fold)
【#13076】 SP076 DWSL Slip compensation scale during regeneration low-speed coil
Set the slip frequency scale at deceleration when using the low-speed coil.
Normally, set to "0". (For machine tool builder adjustment)
---Setting range---
0 to 255 (1/16-fold)
【#13077】 SP077 IQA Q axis current lead compensation
Set the current loop gain.
To use the coil switch function, set the current loop gain for when the high-speed coil is selected.
The setting value is determined by the motor's electrical characteristics so that the value is fixed to
each motor used.
Set the value given in the spindle parameter list. (For machine tool builder adjustment)
---Setting range---
1 to 20480
【#13078】 SP078 IDA D axis current lead compensation
Set the current loop gain.
To use the coil switch function, set the current loop gain for when the high-speed coil is selected.
The setting value is determined by the motor's electrical characteristics so that the value is fixed to
each motor used.
Set the value given in the spindle parameter list. (For machine tool builder adjustment)
---Setting range---
1 to 20480
Scale[%]
100
VGVS VLMT
(SP074) (SP026 1.15)
When lowering the speed loop gain at high speed
Appendix 1.6 Spindle Parameters
Scale[%]
VGVN
(SP073)
>100
100
Motor speed
[r/min]
VGVS
(SP074)
When increasing the speed loop gain at high speed
C70 Setup Manual
Motor speed
[r/min]
VLMT
(SP026 1.15)
319