YASKAWA G7 Series Technical Manual page 110

Control
Method
Open-loop
vector
control 2
(A1-02 = 4)
* The setting is given for 200-240 V Class Drives. Double the voltage for 380-480V Class Drives.
Do not change the Torque Compensation Gain (C4-01) from its default setting of 1.00 when using open-
•
loop vector control 1.
If speeds are inaccurate during regeneration in open-loop vector control 1, enable Slip Compensation Dur-
•
ing Regeneration (C3-04 = 1).
Use slip compensation to improve speed precision during V/f control (A1-02 = 0).
•
Set the Motor Rated Current (E2-01), Motor Rated Slip (E2-02), and Motor No-load Current (E2-03), and
then adjust the Slip Compensation Gain (C3-01) to between 0.5 and 1.5. The default setting for V/f control
is C3-01 = 0.0 (slip compensation disabled).
To improve speed response and stability in V/f control with a PG (A1-02 = 1), set the ASR parameters
•
(C5-01 to C5-05) to between 0.5 and 1.5 times the default. (It is not normally necessary to adjust this set-
ting.) ASR for V/f control with a PG will only control the output frequency; a high gain, such as is possible
for open-loop vector control 2 or flux vector control, cannot be set.
The following user parameters will also indirectly affect the control system.
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4
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Table 4.4 Adjusted User Parameters (Continued)
Name
Performance
(Parameter Number)
ASR proportional • Torque and speed
gain 1 (C5-01) and response
ASR proportional • Controlling hunting
gain 2 (C5-03) and vibration
ASR integral time 1
• Torque and speed
(high-speed) (C5-02)
response
and
• Controlling hunting
ASR integral time 2
and vibration
(low-speed) (C5-04)
Switching the ASR
proportional gain and
ASR switching
integral time
frequency (C5-07)
according to the
output frequency
ASR primary delay • Controlling hunting
time (C5-06) and vibration
• Reducing motor
magnetic noise
Carrier frequency
• Controlling hunting
selection (C6-11)
and vibration at low
speeds (3Hz or less)
Factory
Recommended
Setting
Setting
• Increase the setting if
torque or speed response is
slow.
10.00 10.00 to 50.00
• Reduce the setting if
hunting or vibration
occurs.
• Reduce the setting if
torque or speed response is
0.300
slow.
0.500sec to
• Increase the setting if
1.000sec
hunting or vibration
occurs.
Set the output frequency at
which to change the ASR
0.0 to max. proportional gain and
0.0Hz output integral time when the same
frequency values cannot be used for
both high-speed and
low-speed operation.
Increase the setting if
0.010sec 0.04 to 0.020 machine rigidity is low and
the system vibrates easily.
• Increase the setting if
motor magnetic noise is
Depends high.
on the Default value • Reduce the setting if
capacity. hunting or vibration occurs
at low to middle-range
speeds.
Adjustment Method