ABB ACQ80, Firmware Manual

Page: 128 / 390

128 Parameters
21.23 Smooth start
Selects the forced current vector rotation mode
at low speeds.
When smooth start mode is selected, the rate of
acceleration is limited by the acceleration and
deceleration ramp times. If the process driven by
the permanent magnet synchronous motor has
high inertia, slow ramp times are recommended.
Note : Can be used for permanent magnet
synchronous motors only.
Disabled
Disabled Disabled. 0
Enabled always Enabled always. 1
Start only Enabled when starting the motor. 2
21.24 Smooth start
current
Current used in the current vector rotation at low
speeds.
Increase the smooth start current if the
application requires motor shaft swinging to be
minimized.
Note : Accurate torque control is not possible in
the current vector rotation mode.
Note : Can be used only for permanent magnet
synchronous motors.
50.0%
10.00...100.0% Value in percent of the nominal motor current. 1 = 1%
21.25 Smooth start
speed
Output frequency up to which the current vector
rotation is used. See parameter
21.19 Scalar start
mode
.
Note : Can be used for permanent magnet
synchronous motors only.
10.0%
2.0...100.0% Value as a percentage of the nominal motor
frequency.
1 = 1%
21.27 Torque boost
time
Defines the minimum and maximum torque
boost time.
If torque boost time is less than 40% of
frequency acceleration time (see parameter
28.72
), then torque boost time is set at 40% of
frequency acceleration time.
20.0 s
0.0...60.0 s Nominal motor time. 1 = 1%
No. Name/Value Description Def/
FbEq16