bnp-b2365(eng)b.pdf - 第277页

5. Spindle Adjustment 5 - 32 (6) Adjusting speed loop gain The speed loop gain adj ustment is made to impr ove the high-speed range cha racteristics for speeds of 10,000r/min and highe r. Use only the motor-specific stan…

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5. Spindle Adjustment
5 - 31
(5) Adjusting speed command dual-cushion
When a deceleration start causes rippling in the phase current FB waveform, or when a spindle
override change causes gear impact noise, the speed command dual-cushion (SP046) setting
should be adjusted. The smaller the SP046 setting value, the longer the acceleration/deceleration
time. Therefore, set SP046 value as high as possible, while observing the phase current FB
waveform, or while listening to the impact noise. (Setting upper limit = 5)
No. Abbr. Parameter name Details
Setting
range
Standard
SP046 CSN2* Speed command
dual cushion
For an acceleration/deceleration time constant defined in
SP019 (CSN1) , this parameter is used to provide smooth
movement only at the start of acceleration/deceleration.
As the value of this parameter is smaller, it moves smoother but
the acceleration/deceleration time becomes longer.
To make this parameter invalid, set "0".
0 to 1000 0
Adjusting SP046
Does waveform ripple or
impact noise occur?
Check for other causes
NO
Measure acceleration/deceleration
waveform at high speed
Change the spindle override
Increase SP046 by –1.
YES
Set SP046=5
YES
NO
SP046 adjustment completed
SP046=1 ?
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