YASKAWA GA700 Technical Manual page 658

11.4 C: Tuning
Vibration and oscillation occur at constant
speed.
Speed accuracy is poor when running motors
with significant rated slip in Closed Loop V/
f Control mode.
If C5-12 = 1 or C5-32 = 1 [Enabled] in
Closed Loop V/f Control and over/
undershoot occurs when changing speed.
Oscillation at low speed and response is too
slow at high speed. Alternatively, the
opposite problem occurs.
■
C5-01: ASR Proportional Gain 1
No.
Name
(Hex.)
C5-01 ASR Proportional
Gain 1
(021B)
RUN
The speed response increases with the weight of the load. Normally, the gain increases with larger loads.
Excessive gain causes vibration.
Note:
• Motor 1 ASR is normally set using C5-01 and C5-02 [ASR Integral Time 1]. C5-03 [ASR Proportional Gain 2] can be used in place of
C5-01 by setting H1-xx = 77 [MFDI Function Select = ASR Gain Switch]. C5-01 can also be used in place of C5-04 [ASR Integral
Time 2] when the speed is less than or equal to the frequency set to C5-07 [ASR Gain Switchover Frequency].
• C5-01 is automatically adjusted when the ASR Tuning process is executed.
■
C5-02: ASR Integral Time 1
No.
Name
(Hex.)
C5-02 ASR Integral Time 1
(021C)
RUN
An integral time that is too long reduces the responsiveness of the speed control and weakens repulsion against
external force. An integral time that is too short can cause oscillation.
658
Problem
V/f CL-V/f OLV CLV AOLV
Sets the gain to adjust ASR response.
V/f CL-V/f OLV CLV AOLV
Sets the ASR integral time.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
• Increase C5-06 [ASR Delay Time].
• Check the pulse number set to F1-01 [PG
1 Pulses Per Revolution] and the gear
ratio to F1-12 [PG 1 Gear Teeth 1] and
F1-13 [PG 1 Gear Teeth 2].
• Make sure the pulse signal from the
encoder is set up properly.
• Check U6-04 [ASR Output] and determine
if the ASR is working at its output limit
set to C5-05 [ASR Limit]. If the ASR is at
the output limit, increase C5-05.
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
-
• Decrease the value set to C5-05.
• 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 up 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 define optimal
ASR settings for high and low speed. Use
C5-07 [ASR Gain Switchover Frequency]
to switch the ASR proportional gain and
ASR integral time in accordance with the
output frequency.
Description
OLV/PM OLV/PM AOLV/PM CLV/PM EZOLV
Description
OLV/PM OLV/PM AOLV/PM CLV/PM EZOLV
Possible Solutions
Default
(Range)
Determined by A1-02
(0.00 - 300.00)
Default
(Range)
Determined by A1-02
(0.000 - 10.000 s)