ABB ACS355 User Manual

142 Program features
Speed controller tuning
It is possible to manually adjust the controller gain, integration time and derivation
time, or let the drive perform a separate speed controller Autotune run (parameter
2305 AUTOTUNE RUN). In Autotune run, the speed controller is tuned based on the
load and inertia of the motor and the machine. The figure below shows speed
responses at a speed reference step (typically, 1 to 20%).
The figure below is a simplified block diagram of the speed controller. The controller
output is the reference for the torque controller.
Note: The speed controller can be used in vector control, ie when 9904 MOTOR
CTRL MODE setting is VECTOR: SPEED or VECTOR: TORQ.
 Settings
Parameter groups 23 SPEED CONTROL and 20 LIMITS
A: Undercompensated
B: Normally tuned (autotuning)
C: Normally tuned (manually). Better dynamic performance than with B
(%)
n
C
B
D
n
N
A
t
Derivative
Proportional,
integral
Derivative
acceleration
Torque
reference
Speed
reference
Calculated actual speed
Error
value
-
+
+
+
+

ABB ACS355 Specifications

General

Input Voltage	200 V to 240 V AC, 380 V to 480 V AC
Frequency	47 Hz to 63 Hz
Control Method	Scalar control
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Modbus RTU, CANopen
Enclosure Rating	IP20
Operating Temperature	-10°C to +50°C (14°F to 122°F)
Storage Temperature	-40°C to +70°C (-40 to +158 °F)
Humidity	95% RH (non-condensing)
Altitude	Up to 1000 m (3280 ft) without derating