bnp-b2365(eng)b.pdf - 第278页
5. Spindle Adjustment 5 - 33 (7) Adjusting current loop gain Although the default setting value is usually appropri ate, an adjustment may be required if slight vibration occurs at high spindle motor rotating. In such ca…
5. Spindle Adjustment
5 - 32
(6) Adjusting speed loop gain
The speed loop gain adjustment is made to improve the high-speed range characteristics for
speeds of 10,000r/min and higher. Use only the motor-specific standard settings for the basic
parameters (SP022, SP023).
If the problems shown below occur during constant-speed operation at a speed of 10,000r/min or
higher, adjust the target value of variable speed loop proportional gain (SP065) and the change
starting speed of variable speed loop proportional gain (SP066) parameter settings.
1) A swell or spike ap pears in the current waveform
2) An overvoltage con dition (alarm 32) occurs
If the maximum speed is 10,000 r/min or less, or if no improvement is seen after adjusting the
speed loop gain, then adjust the current loop gain.
No. Abbr. Parameter name Details
Setting
range
Standard
SP022 VGNP1* Speed loop gain
proportional term
under speed control
0 to 1000 63
SP023 VGMI1* Speed loop gain
integral term under
speed control
Basically, use standard setting value set for each motor.
0 to 1000 60
SP065 VCGN1* Target value of
variable speed loop
proportional gain
Set the magnification of speed loop proportional gain with
respect to SP022 (VGNP1) at the maximum motor speed
defined in SP017 (TSP).
0 to 100
(%)
100
SP022
SP022×
(SP065/100)
SP066 VCSN1* Change starting
speed of variable
speed loop
proportional gain
Set the speed when the
speed loop proportional
gain change starts.
Set 10,000 normally.
0 SP066 SP017
0 to 32767
(r/min)
0
Adjusting SP065
Abnormal current waveform
alarm activated?
SP065 adjustment completed
Increase SP065 by –10.
YES
Measure acceleration/deceleration
waveform at high speed
SP065=30?
NO
Set SP065=100,
SP066=10000
YES
Adjust the current loop gain
5. Spindle Adjustment
5 - 33
(7) Adjusting current loop gain
Although the default setting value is usually appropriate, an adjustment may be required if slight
vibration occurs at high spindle motor rotating. In such cases, adjust the target value of variable
current loop gain (SP069) parameter setting while observing the current waveform in the
high-speed range. Adjust until the output waveform to the spindle motor stabilizes.
Set the change starting/ending sp eed of variable current loop gain (SP067 and SP068) param eters
in accordance with the motor's maximum rotation sp eed.
No. Abbr. Parameter name Details
Setting
range
Standard
SP067 VIGWA* Change starting
speed of variable
current loop gain
Set the speed where the current loop gain change starts. 0 to 32767
(r/min)
0
SP068 VIGWB* Change ending
speed of variable
current loop gain
Set the speed where the current loop gain change ends. 0 to 32767
(r/min)
0
Set the magnification of current loop gain (torque component
and excitation component) for a change ending speed defined
in SP068 (VIGWB).
When this parameter is set to "0", the magnification is 1.
SP069×(1/16) fold
1-fold
SP067 SP068 SP017
SP069 VIGN* Target value of
variable
current loop gain
Setting value SP017(TSP)
Maximum motor
speed
SP067
(VIGWA)
SP068
(VIGWB)
SP069
(VIGN)
0 to 6000 0 0 0
6001 to 8000 5000 8000 45
8001 or more 5000 10000 64
0 to 32767
(1/16-fold)
0
Adjusting SP069
Vibration in current waveform?
SP069 adjustment completed
NO
NO
Measure acceleration/deceleration
waveform at high speed
Increase SP069 by +8.
YES
YES
Default settings in accordance
with motor's max. rotation speed
(SP067, SP068, SP069)
Improved?
A
djust by increasing the SP069
setting in increments of 8
A
djust by decreasing the SP069
setting in decrements of 8
5. Spindle Adjustment
5 - 34
(8) Adjusting excitation rate
If the motor noise is excessive during constant-speed operation, adjust the variable excitation
(SP056) value downward in decrements of 10 from the standard setting of 50 (setting lower limit =
25). The SP033/bit9 parameter setting is an effective way to reduce noise for hi gh-speed operation
only (it lowers the excitation rate for high-speed operation only).
No. Abbr. Parameter name Details
Setting
range
Standard
SP056 PYVR Variable excitation
(min value)
Set the minimum value of the variable excitation rate.
Select a smaller value when gear noise is too high.
Larger value is more effective on impact response.
0 to 100
(%)
50
<For MDS-C1-SP/SPH/SPX/SPHX>
F EDCBA98765 4 3 2 10
poff hzs ront pycal pychg pyst pyoff sftk dflt 1a2m
bit Meaning when set to 0 Meaning when set to 1
Standard
9 pycal
(Conventional specifications) High-speed rate deceleration
method valid for minimum
excitation rate
0
SP033 SFNC1* Spindle function 1