12.4 C: Tuning
786 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Problem Possible Solutions
When C5-12 = 1 or C5-32 = 1 [Enabled] in Closed Loop
V/f Control, over/undershoot occurs if you change speeds.
-
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
• Decrease the value set to C5-05.
Oscillation at low speed and response is too slow at high
speed.
Oscillation at high speed and response is too slow at low
speed.
-
• Closed Loop V/f Control Mode:
Use C5-03 and C5-04 at maximum speed and C5-01 and
C5-02 at minimum speed to set different ASR settings.
• Closed Loop Vector Control, PM Advanced Open Loop
Vector Control, and PM Closed Loop Vector Control:
Use C5-01 to C5-04 to set the best ASR settings for high
and low speed. Use C5-07 [ASR Gain Switchover
Frequency] to switch the ASR proportional gain and
ASR integral time as specified by the output frequency.
■ C5-01: ASR Proportional Gain 1
No.
(Hex.)
Name Description
Default
(Range)
C5-01
(021B)
RUN
ASR Proportional Gain 1
Sets the gain to adjust ASR response.
Determined by A1-02
(0.00 - 300.00)
A higher gain provides a higher speed response. Usually, the gain increases with larger loads. Too much gain will
cause vibration.
Note:
• The drive usually sets Motor 1 ASR with C5-01 and C5-02 [ASR Integral Time 1]. You can switch between C5-01 and C5-03 [ASR
Proportional Gain 2] by setting H1-xx = 77 [MFDI Function Selection = ASR Gain (C5-03) Select]. You can also use C5-01 and C5-02 as
alternatives to C5-03 and C5-04, respectively, when the speed is less than or equal to the frequency set in C5-07 [ASR Gain Switchover
Frequency].
• The drive automatically adjusts C5-01 in ASR Tuning.
■ C5-02: ASR Integral Time 1
No.
(Hex.)
Name Description
Default
(Range)
C5-02
(021C)
RUN
ASR Integral Time 1
Sets the ASR integral time.
Determined by A1-02
(0.000 - 60.000 s)
When you increase the integral time, the responsiveness will decrease. An integral time that is too short can cause
oscillation.
■ C5-03: ASR Proportional Gain 2
No.
(Hex.)
Name Description
Default
(Range)
C5-03
(021D)
RUN
ASR Proportional Gain 2
Sets the gain to adjust ASR response.
Determined by A1-02
(0.00 - 300.00)
A higher gain provides a higher speed response. Usually, the gain increases with larger loads. Too much gain will
cause vibration.
■ C5-04: ASR Integral Time 2
No.
(Hex.)
Name Description
Default
(Range)
C5-04
(021E)
RUN
ASR Integral Time 2
Sets the ASR integral time.
Determined by A1-02
(0.000 - 60.000 s)
When you increase the integral time, the responsiveness will decrease. An integral time that is too short can cause
oscillation.
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