Rush Control - ABB ACS380 Firmware Manual

ACS380 FW.book Page 70 Friday, May 4, 2018 4:18 PM
70 Program features
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Rush control

Rush control is automatically on when the operation mode is torque. In torque control,
the motor could potentially rush if the load were suddenly lost. The control program
has a rush control function that decreases the torque reference whenever the motor
speed exceeds the set minimum speed or maximum speed.
Motor speed
30.12
30.11
The function is based on a PI controller. The program sets the proportional gain to
10.0 and integration time to 2.0 s.
Settings
Parameters 30.11 Minimum speed
and 31.30 Overspeed trip margin
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Encoder echo support
The connection of one encoder to several drives with the BTAC-02 encoder interface
module can be done by using a daisy chain wiring scheme. This means wiring
channels A, B, Z and GND of multiple encoder modules together with the encoder.
Settings
Parameter groups
(page 328) and 92 Encoder 1 configuration
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Jogging
The jogging function enables the use of a momentary switch to briefly rotate the
motor. The jogging function is typically used during servicing or commissioning to
control the machinery locally.
Two jogging functions (1 and 2) are available, each with their own activation sources
and references. The signal sources are selected by parameters
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Overspeed trip level
0
Rush control active
Overspeed trip level
(page 217),
(page 229).
90 Feedback selection (page 327),
(page 329).
31.30 Overspeed trip margin
Time
31.30 Overspeed trip margin
30.12 Maximum speed (page 217)
91 Encoder adapter settings
20.26 and 20.27.