Parameter Details
11
11.4 C: Tuning
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 765
Table 11.38 ASR Response and Possible Solutions
Problem Possible Solutions
Speed response is slow.
• Increase C5-01/C5-03 [ASR Proportional
Gain].
• Decrease C5-02/C5-04 [ASR Integral
Time].
Overshoot or undershoot occurs at the end of
acceleration or deceleration.
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
Vibration and oscillation occur at constant
speed.
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
• Increase C5-06 [ASR Delay Time].
Speed accuracy is unsatisfactory when you
operate a motor that has a large quantity of
rated slip in Closed Loop V/f Control.
• Check the pulse number set to F1-01
[Encoder 1 Pulse Count (PPR)] and the
gear ratio to F1-12 [Encoder 1 Gear Teeth
1] and F1-13 [Encoder 1 Gear Teeth 2].
• Make sure that you correctly set the pulse
signal from the encoder.
• Check U6-04 [ASR Output] to make sure
that the ASR operates at its output limit
set to C5-05 [ASR Limit]. If the ASR is at
the output limit, increase C5-05.
If C5-12 = 1 or C5-32 = 1 [Enabled] in
Closed Loop V/f Control and over/
undershoot occurs when 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)
The speed response increases as the gain increases. Usually, the gain increases with larger loads. Too much gain
causes vibration.
Note:
• The drive usually sets Motor 1 ASR with C5-01 and C5-02 [ASR Integral Time 1]. To use C5-03 [ASR Proportional Gain 2] as an
alternative to C5-01 set H1-xx = 77 [MFDI Function Select = ASR Gain (C5-03) Select]. You can also use C5-01 as an alternative to
C5-04 [ASR Integral Time 2] 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.
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