ABB ACS580 - Page 206

202 Parameters
Torque boost The drive pre-magnetizes the motor before the start. The pre-
magnetizing time is defined by parameter 21.02
Magnetization time.
Torque boost is applied at start. Torque boost is stopped
when output frequency exceeds 20 Hz or when it is equal to
the reference value. See parameter 21.26 Torque boost
current.
This mode should selected if a high break-away torque is
required.
Note: This mode cannot be used to start into a rotating motor.
WARNING! The drive will start after the set pre-
magnetizing time has passed even if motor
magnetization is not completed. In applications where
a full break-away torque is essential, ensure that the constant
magnetizing time is long enough to allow generation of full
magnetization and torque.
3
Automatic+boost Automatic start with torque boost.
Automatic start is performed first and the motor is
magnetized. If the speed is found to be zero, torque boost is
applied.
4
21.21 DC hold frequency Defines the DC hold frequency, which is used instead of
parameter 21.09 DC hold speed when the motor is in scalar
frequency mode. See parameter 21.08 DC current control,
and section DC hold (page 11 5).
5.00 Hz
0.00…1000.00 Hz DC hold frequency. 1 = 1 Hz
21.22 Start delay Defines the start delay. After the conditions for start have
been fulfilled, the drive waits until the delay has elapsed and
then starts the motor. During the delay, warning AFE9 Start
delay is shown.
Start delay can be used with all start modes.
0.00 s
0.00…60.00 s Start delay 1 = 1 s
21.23 Smooth start Selects the forced current vector rotation mode at low
speeds. When the 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.
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 needs to be minimized. Note that
accurate torque control is not possible in the current vector
rotation mode.
Can be used for permanent magnet synchronous motors
only.
50.0%
10.0…100.0% Value in percent of the nominal motor current. 1 = 1%
No. Name/Value Description Def/FbEq16
ACS580 FW.book Page 202 Wednesday, September 21, 2016 9:48 PM