Parameter Details
12
12.3 C: TUNING
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 579
Table 12.19 ASR Response and Possible Solutions
Problem Possible Solutions
Speed response is slow.
• Increase C5-01/C5-03 [ASR PGain 1/ASR PGain 2].
• Decrease C5-02/C5-04 [ASR ITime 1/ASR ITime 2].
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 [Enc1 Pulse
Count (PPR)] and the gear ratio to F1-12 [Enc1 Gear
Teeth1] and F1-13 [Enc1 Gear Teeth2].
• 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 Switch
Frequency] to switch the ASR proportional gain and
ASR integral time as specified by the output
frequency.
■ C5-01 ASR PGain 1
No.
(Hex.)
Name Description
Default
(Range)
C5-01
(021B)
RUN
ASR PGain 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 ITime 1]. To use C5-03 [ASR PGain 2] as an alternative to C5-01 set
H1-xx = 45 [MFDI Function Select = ASR Gain Switch]. You can also use C5-01 as an alternative to C5-04 [ASR ITime 2] when the
speed is less than or equal to the frequency set in C5-07 [ASR Gain Switch Frequency].
• The drive automatically adjusts C5-01 in ASR Tuning.
■ C5-02 ASR ITime 1
No.
(Hex.)
Name Description
Default
(Range)
C5-02
(021C)
RUN
ASR ITime 1
Sets the ASR integral time.
Determined by A1-02
(0.000 - 60.000 s)
An integral time that is too long will decrease the responsiveness of the speed control and decrease drive response
to dynamic changes in motor load. An integral time that is too short can cause oscillation.
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