B–63610EN/01
4. DESCRIPTION OF PARAMETERS
205
NOTE
1 This parameter is valid when bit 6 (ESI) of parameter
No.4950=1.
2 Make sure that M codes from Mα to M (α+β–1) do not
duplicate other M codes.
3 Setting this parameter to 0 has the same effect as setting 6.
That is, M code from Mα to M (α+5) are used for half–fixed
angle positioning.
4970
Servo loop gain of the spindle
[Data type] Word
[Unit of data] 0.01 s
–1
[Valid data range] 1 to 9999
Set the servo loop gain of the spindle in the spindle positioning mode.
4971
Servo loop gain multiplier of the spindle for gear 1
4972
Servo loop gain multiplier of the spindle for gear 2
4973
Servo loop gain multiplier of the spindle for gear 3
4974
Servo loop gain multiplier of the spindle for gear 4
[Data type] Word
Set the servo loop gain multipliers of the spindle for gears 1 to 4.
The multipliers are used to convert the amount of the position deviation to
the voltage used in the velocity command. Assign the data obtained from
the following equation to the parameters.
Loop gain multiplier = 2048000 E A/L
where;
E : Voltage required to rotate the spindle motor at 1000 min
–1
in
the velocity command
L : Rotation angle of the spindle per one motor rotation
(normally 360)
A : Unit used for the detection (degree)
Let E be 2.2 V, L be 360 degrees, and A be 0.088 degrees/pulse.
Loop gain multiplier = 2048000 2.2 0.088/360 = 1101
* When the voltage specified for the spindle motor is 10 V at a spindle
speed of 4500 min
–1
, E is regarded as 2.2 V.
NOTE
The above parameters No.4970 to No.4974 are for analog
spindles.
Example