Parameters 175
21.19
Scalar start mode
Selects the motor start function for the scalar motor
control mode, ie. when
99.04 Motor control mode
is set to
Scalar
.
Notes
:
• The start function for the vector motor control mode is
selected by parameter
21.01
Vector start mode
.
• With permanent magnet motors,
Automatic
start mode
must be used.
• This parameter cannot be changed while the drive is
running.
See also section
DC magnetization
on page
77
.
Const time
Normal
Immediate start from zero speed.
0
Const time
The drive pre-magnetizes the motor before start. The pre-
magnetizing time is defined by parameter
21.02
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.
Note:
This mode cannot be used to start into a rotating
motor.
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.
1
Automatic
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.
2
Torque boost
Torque boost is applied at start, ending when output
frequency exceeds 40% of nominal frequency or when
output frequency is equal to reference.
3
Aut boost
If the Flystart routine does not detect rotating motor,
torque boost is applied.
4
Flying start
The drive automatically selects the correct output
frequency to start a rotating motor. If the motor is already
rotating, drive will start smoothly at the current frequency.
The mode will start the motor with vector control and
switch to scalar control on the fly when the motor speed
has been found. Compared to the Automatic start mode,
Flying start detects the motor speed faster. Flying start
requires more accurate information about motor model.
Therefore standstill ID run is done automatically when the
drive is started for the first time after selecting Flying start.
Motor plate values should be accurate. Wrong plate
values may decrease the starting performance.
Note:
Flying start cannot be used in multimotor systems.
5
Flying start+boost
Flying start with torque boost.
Flying start is performed first and the motor is magnetized.
If the speed is found to be zero, torque boost is applied.
6
No.
Name/Value
Description
Default
FbEq 16
ACS380 FW.book Page 175 Friday, May 4, 2018 4:18 PM
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