Appendix 1.5 Servo Parameters - Mitsubishi Electric C70 Setup Manual

MITSUBISHI CNC
Appendix 1 Explanation of Parameters

Appendix 1.5 Servo Parameters

The parameters with "(PR)" requires the CNC to be turned OFF after the settings. Turn the power OFF and ON to enable
the parameter settings.
【#2201(PR)】 SV001 PC1 Motor side gear ratio
Set the gear ratio in the motor side when there is the gear between the servo motor's shaft and
machine (ball screw, etc.).
For the rotary axis, set the total deceleration (acceleration) ratio.
Even if the gear ratio is within the setting range, the electronic gears may overflow and an initial
parameter error (servo alarm 37) may occur.
For linear servo system
Set to "1".
---Setting range---
1 to 32767
【#2202(PR)】 SV002 PC2 Machine side gear ratio
Set the gear ratio in the machine side when there is the gear between the servo motor's shaft and
machine (ball screw, etc.).
For the rotary axis, set the total deceleration (acceleration) ratio.
Even if the gear ratio is within the setting range, the electronic gears may overflow and an initial
parameter error (servo alarm 37) may occur.
For linear servo system
Set to "1".
---Setting range---
1 to 32767
【#2203】 SV003 PGN1 Position loop gain 1
Set the position loop gain. The standard setting is "33".
The higher the setting value is, the more accurately the command can be followed, and the shorter
the settling time in positioning gets, however, note that a bigger shock will be applied to the machine
during acceleration/deceleration.
When using the SHG control, also set SV004 (PGN2) and SV057 (SHGC).
When using the OMR-FF control, set the servo rigidity against quadrant projection or cutting load,
etc. For the tracking ability to the command, set by SV106(PGM).
---Setting range---
1 to 200 (rad/s)
【#2204】 SV004 PGN2 Position loop gain 2
When performing the SHG control, set the value of "SV003 x 8/3" to "SV004".
When not using the SHG control, set to "0".
When using the OMR-FF control, set to "0".
Related parameters: SV003, SV057
---Setting range---
0 to 999 (rad/s)
【#2205】 SV005 VGN1 Speed loop gain 1
Set the speed loop gain.
The higher the setting value is, the more accurate the control will be, however, vibration tends to
occur.
If vibration occurs, adjust by lowering by 20 to 30%.
The value should be determined to the 70 to 80% of the value at which the vibration stops.
The value differs depending on servo motors.
Aim at the standard value determined by the servo motor type and load inertia ratio to adjust.
---Setting range---
1 to 30000
250