ABB ACS880 Firmware Manual page 291

No. Name / Range /
Selection
Automatic
Flying start
21.2 Magnetization time
0...10000 ms
21.3 Stop mode
Coast
Ramp
Description
Automatic start guarantees optimal motor start in
most cases.
It includes the flying start function (starting into a
rotating motor) and the automatic restart function (a
stopped motor can be restarted immediately without
waiting the motor flux to die away). The drive motor
control program identifies the flux as well as the
mechanical state of the motor and starts the motor
instantly under all conditions.
This method is intended for asynchronous motors only,
and is optimized for applications where the drive must
be started into a rotating motor at high frequencies
(above 150 Hz).
Defines the pre-magnetization time when
• parameter 21.1 Start mode
(in DTC motor control mode), or
• parameter 21.19 Scalar start mode
time (in scalar motor control mode).
After the start command, the drive automatically
premagnetizes the motor for the set time. To ensure
full magnetizing, set this parameter to the same value
as, or higher than, the rotor time constant. If not
known, use the rule-of-thumb value given in the table
below:
Motor rated power
< 1 kW
1 to 10 kW
10 to 200 kW
200 to 1000 kW
Note: This parameter cannot be changed while the
drive is running.
Constant DC magnetizing time.
Selects the way the motor is stopped when a stop
command is received.
Additional braking is possible by selecting flux braking
(see parameter 97.5 Flux
Note: This parameter has no effect in a follower drive
in a master/follower configuration.
Stop by switching off the output semiconductors of
the drive.
The motor coasts to a stop.
WARNING!
If a mechanical brake is used, ensure it is safe
to stop the drive by coasting.
Stop along the active deceleration ramp. See parameter
group 23 Speed reference ramp (page
is set to Constant time
is set to
Constant magnetizing time
≥ 50 to 100 ms
≥ 100 to 200 ms
≥ 200 to 1000 ms
≥ 1000 to 2000 ms
braking).
311).
Parameters 291
Def / Type
FbEq 16b / 32b
2
3
500 ms / uint16
Const
1 = 1 ms / 1 = 1 ms
Coast / uint16
0
1