ABB ACS880-x04, Firmware Manual

Page: 211 / 604

Parameters 211
21.18 Auto restart time The motor can be automatically started after a short supply
power failure using the automatic restart function. See section
Automatic restart (page 76 ).
When this parameter is set to 0.0 seconds, automatic
restarting is disabled. Otherwise, the parameter defines the
maximum duration of the power failure after which restarting is
attempted. Note that this time also includes the DC pre-
charging delay.
WARNING! The function restarts the drive
automatically and continues operation after a supply
break. Make sure that no dangerous situations can
occur.
5.0 s
0.0 s Automatic restarting disabled. 0
0.1 … 5.0 s Maximum power failure duration. 1 = 1 s
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 DTC motor control mode is
selected by parameter 21.01 Start mode .
• With permanent magnet motors, Automatic start mode
must be used.
See also section DC magnetization (page 63 ).
Normal
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 This setting should be used
• in applications where flying starts (ie. starting into a rotating
motor) are required, and
• with permanent magnet motors.
2
21.20 Follower force ramp
stop In a torque-controlled follower drive, forces (or selects a
source that forces) the drive to switch to speed control upon a
ramp stop (Off1 or Off3) command. This is required for an
independent ramp stop of the follower.
See also section
Master/follower functionality (page 31 ).
1 = Ramp stop forces speed control
Not selected
Not selected 0. 0
Selected 1. 1
DIIL DIIL input ( 10.02 DI delayed status , bit 15). 2
DI1 Digital input DI1 ( 10.02 DI delayed status , bit 0). 3
DI2 Digital input DI2 ( 10.02 DI delayed status , bit 1). 4
DI3 Digital input DI3 ( 10.02 DI delayed status , bit 2). 5
No. Name/Value Description Def / FbEq16