ABB +N5600 Firmware Instructions page 243

No. Name/Value
Constant time
Automatic
Flying start
21.02 Magnetization time
0 ... 10000 ms
21.03 Stop mode
Coast
Description
The drive pre-magnetizes the motor before start. The pre-
magnetizing time is defined by parameter
Magnetization time. This mode should be selected if constant
pre-magnetizing time is required (e.g. if the motor start must
be synchronized with the release of a mechanical brake).
This setting also guarantees the highest possible break-away
torque when the pre-magnetizing time is set long enough.
WARNING! The drive will start after the set
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 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 21.01 Start mode
DTC motor control mode), or
• parameter 21.19 Scalar start mode
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 97.05 Flux braking).
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.
Parameters 243
21.02
is set to Constant time (in
is set to Const time
Constant magnetizing time
> 50 to 100 ms
> 100 to 200 ms
> 200 to 1000 ms
> 1000 to 2000 ms
Def/FbEq16
1
2
3
500 ms
(in
1 = 1 ms
Coast
0