ABB ACQ580 Firmware Manual page 157

No. Name/Value
Automatic
Torque boost
Automatic+boost
21.21 DC hold frequency
0.00...1000.00 Hz
21.22 Start delay
0.00...60.00 s
21.23 Smooth start
Disabled
Enabled always
Start only
Description
The drive automatically selects the correct output frequency
to start a rotating motor. This is useful for flying starts: if the
motor is already rotating, the drive will start smoothly at the
current frequency.
Note: Cannot be used in multimotor systems.
The drive pre-magnetizes the motor before the start. The pre-
magnetizing time is defined by parameter
Magnetization time.
Torque boost is applied at start. Torque boost is stopped
when output frequency exceeds 40% of nominal frequency or
when it is equal to the reference value. See parameter
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.
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.
Defines the DC hold frequency, which is used instead of
parameter 21.09 DC hold speed
frequency mode. See parameter
and section DC hold (page 77).
DC hold frequency.
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
delay is shown.
Start delay can be used with all start modes.
Start delay
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.
Enabled always.
Enabled when starting the motor.
Parameters 153
21.02
21.26
when the motor is in scalar
21.08 DC current control,
AFE9 Start
Def/FbEq16
2
3
4
5.00 Hz
1 = 1 Hz
0.00 s
1 = 1 s
Disabled
0
1
2