6. Control Functions and Parameter Settings
6-13
Block-B parameters (Extended function constants) list
Application
No.
Parameter
Unit
Default
Min.
Max.
Function
ST
V/f VEC PM
B23 – Torque Boost (Dual Drive)
0
Manual torque boost
voltage
%
Inverter
rating
0.0
20.0
This is the boost voltage at 0Hz.
1
Square reduction
torque setting
%
0.0
0.0
25.0
This is the reduced voltage at half of
base frequency.
B24 – DC Brake (Dual Drive)
0
DC braking voltage
%
Inverter
rating
0.1
20.0
1
DC braking time
sec
2.0
0.0
20.0
B25 – Overcurrent limit (Dual Drive)
0
Overcurrent limit
%
150.
100.
300.
1
Regenerative current
limit
%
10.
5.
300.
Set to 10% if there is not DBR.
2
Torque stabilisation
gain
1.00
0.
4.00
Increase if the motor vibrates.
B30 – Speed control extended function
0
Load torque observer
gain
0.
0.
200.
This is the gain for the load torque
observer.
To increase the response
characteristic from an external
disturbance, set a large gain.
Note that if the gain is set too high,
the output torque could start hunting.
When set to zero, the load torque
observer will not function.
1
Model machine time
constant
ms
500.
10.
20000.
Set the model machine time constant
used by the load torque observer.
2
ASR proportional
change rate limit
%
50.0
1.0
400.0
If the speed setting value or motor
speed change suddenly, this will
prevent the ASR's, P response, from
suddenly changing.
3
LPF time constant for
Speed setting
ms
0.
0.
1000.
This filter is used to suppress
overshooting, by setting a time
constant equivalent to the speed
response.
4
LPF time constant for
Speed detection
ms
2.
0.
1000.
This filter is used to suppress the
noise in speed detection.
5
LPF time constant for
Speed detection ASR
ms
0.
0.
1000.
This filter is used for the speed
detection in the ASR.
6
LPF time constant for
flux compensation
ms
20.
0.
1000.
This filter affects the speed detection
used in constant power or iron loss
compensations, etc.
7
LPF time constant for
actual Torque setting
ms
0.
0.
1000.
Set the low path filter time constant
used for the torque current command.
8
LPF time constant for
drooping
ms
100.
0.
1000.
Set the low path filter time constant
used for drooping value input into the
speed regulator.