YASKAWA VARISPEED-616G5 Instruction Manual page 154

Basic Operation
6.5.5 Adjusting Speed Control (ASR) Gain
6
The multi-function analog outputs have the following functions with these constant settings.
Multi-function analog output 1 (terminal 21): Outputs Inverter's output frequency(0 to ±10 V).
•
Multi-function analog output 2 (terminal 23): Outputs the actual motor speed (0 to ±10 V).
•
Terminal 22 is the multi-function analog output common.
We recommend monitoring both the output frequency and the motor speed to monitor the response
delay or deviations from the reference value, as shown in the following diagram.
Output frequency
Motor speed
Fig 6.23 Example Monitor Waveforms
3. Give acceleration/deceleration commands and adjust the gain while observing the waveform.
Motor speed
Fig 6.24 Gain Adjustments
4. If the overshooting or undershooting can't be eliminated by adjusting the gain, decrease the ASR limit
(C5-05) to lower the frequency reference compensation limit.
User User
Constant Name
Number
C5-05 ASR limit
Since C5-05 can't be changed during operation, stop the Inverter's operation and then decrease
•
the ASR limit by 0.5 (%).
Perform step 3 again after the setting has been changed.
•
The ASR limit is the frequency limit for compensation by speed control. Set this frequency limit
•
as a percentage of the maximum output frequency.
If the frequency limit is lowered too much, the motor speed might not reach the target speed. Verify
•
that the target speed is reached during normal operation.
Motor speed (response)
If overshooting occurs:
Decrease C5-01 and increase C5-02.
If undershooting occurs:
Decrease C5-03 and increase C5-04.
Change g
during during Setting Setting Unit Factory
Opera- Range
tion
0.0 to 20.0 %
×
6 - 46
Valid Access Levels
Factory
Open
V/f V/f with
Setting
Loop
Control PG
Vector
5.0 A
× ×
Time
Time
Flux
Vector
×