Actual signals and parameters 239
2304 ACC
COMPENSATI
ON
Defines the derivation time for acceleration/(deceleration)
compensation. In order to compensate inertia during
acceleration, a derivative of the reference is added to the
output of the speed controller. The principle of a derivative
action is described for parameter
.
Note:
As a general rule, set this parameter to the value
between 50 and 100% of the sum of the mechanical time
constants of the motor and the driven machine. (The speed
controller Autotune run does this automatically, see
parameter
.)
The figure below shows the speed responses when a high
inertia load is accelerated along a ramp.
0.00 s
0.00…600.00 s Time
1 = 0.01 s
2305 AUTOTUNE
RUN
Start automatic tuning of the speed controller. Instructions:
• Run the motor at a constant speed of 20 to 40% of the
rated speed.
• Change the autotuning parameter 2305 to
.
Note:
The motor load must be connected to the motor.
OFF
No autotuning
0
ON
Activates the speed controller autotuning. The drive
• accelerates the motor
• calculates values for proportional gain, integration time
and acceleration compensation (parameter
and
values).
Setting is automatically reverted to
.
1
24 TORQUE
CONTROL
Torque control variables
2401 TORQ RAMP
UP
Defines the torque reference ramp up time, ie, the minimum
time for the reference to increase from zero to the nominal
motor torque.
0.00 s
0.00…120.00 s Time
1 = 0.01 s
All parameters
No.
Name/Value
Description
Def/FbEq
t
t
No acceleration
compensation
Acceleration
compensation
Speed reference
Actual speed
%
%
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...