Speed Reference Selection - ABB ACS880 Firmware Manual

156 Parameters
No. Name/Value
21.18 Auto restart time
0.0 s
0.1 ... 5.0 s
21.19 Scalar start mode
Normal
Const time
Automatic
22
22 Speed reference
selection
22.01 Speed ref unlimited
-30000.00 ...
30000.00 rpm
Description
The motor can be automatically started after a short supply
power failure using the automatic restart function. See section
Automatic restart (page 59).
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.
Automatic restarting disabled.
Maximum power failure duration.
Selects the motor start function for the scalar motor control
mode, ie. when 99.04 Motor control mode
Notes:
• The start function for the DTC motor control mode is
selected by parameter
• With permanent magnet motors,
must be used.
• This parameter cannot be changed while the drive is
running.
See also section DC magnetization
Immediate start from zero speed.
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.
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.
This setting should be used in applications where flying starts
(ie. starting into a rotating motor) are required.
Speed reference selection; motor potentiometer settings.
See the control chain diagrams on pages 390...392.
Displays the output of the speed reference selection block.
See the control chain diagram on page 391.
This parameter is read-only.
Value of the selected speed reference.
is set to Scalar.
21.01 Start mode.
Automatic start mode
(page 48).
21.02
Def/FbEq16
5.0 s
0
1 = 1 s
Normal
0
1
2
-
See par.
46.01