Rush Control; Encoder Support - ABB ACS880 Firmware Manual

40 Program features


Rush control

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
Motor speed
30.12
30.11
The function is based on a PI controller. The proportional gain and integration time
can be defined by parameters.
Settings
Parameters 26.81 Rush control gain
181).


Encoder support

The program supports two single-turn or multiturn encoders (or resolvers). The
following optional interface modules are available:
• TTL encoder interface FEN-01: two TTL inputs, TTL output (for encoder
emulation and echo) and two digital inputs for position latching
• Absolute encoder interface FEN-11: absolute encoder input, TTL input, TTL
output (for encoder emulation and echo) and two digital inputs for position latching
• Resolver interface FEN-21: resolver input, TTL input, TTL output (for encoder
emulation echo) and two digital inputs for position latching
• HTL encoder interface FEN-31: HTL encoder input, TTL output (for encoder
emulation and echo) and two digital inputs for position latching.
The interface module can be installed onto any option slot on the drive control unit, or
onto an FEA-xx extension adapter.
30.11 Minimum speed
Overspeed trip level
0
Rush control active
Overspeed trip level
and
or
31.30 Overspeed trip margin
Time
31.30 Overspeed trip margin
26.82 Rush control integration time
30.12 Maximum speed.
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