ABB ACS880 Series, Firmware Manual

Page: 290 / 764

Def / Type
FbEq 16b / 32b Description Name / Range /
Selection No.
Start and stop modes; emergency stop mode and signal
source selection; DC magnetization settings;
autophasing mode selection. Start/stop mode 21
Automatic / uint16 Selects the motor start function for the DTC motor
control mode, ie. when
99.4 Motor control mode is set
to DTC.
Start mode 21.1
Note:
• The start function for the scalar motor control
mode is selected by parameter
21.19 Scalar start
mode .
• Starting into a rotating motor is not possible when
DC magnetizing is selected (
Fast or Constant
time ).
• With permanent magnet motors and synchronous
reluctance motors,
Automatic start mode must
be used.
• This parameter cannot be changed while the drive
is running.
See also section DC magnetization (page 106) .
0 The drive pre-magnetizes the motor before start. The
premagnetizing time is determined automatically, Fast
being typically 200 ms to 2 s depending on motor size.
This mode should be selected if a high break-away
torque is required.
1 The drive pre-magnetizes the motor before start. The
premagnetizing time is defined by parameter
21.2
Constant time
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.
290 Parameters