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.
V/f
CL-V/f
OLV
CLV
AOLV
OLV/PM
OLV/PM AOLV/PM CLV/PM
EZOLV