ABB ACS880 Firmware Manual page 294

294 Parameters
No. Name / Range /
Selection
21.7 Zero speed delay
0...30000 ms
Description
Defines the delay for the zero speed delay function.
The function is useful in applications where a smooth
and quick restarting is essential. During the delay, the
drive knows the rotor position accurately.
Without zero speed delay:
The drive receives a stop command and decelerates
along a ramp. When actual motor speed falls below the
value of parameter 21.6 Zero speed
modulation is stopped and the motor coasts to a
standstill.
Speed
With zero speed delay:
The drive receives a stop command and decelerates
along a ramp. When actual motor speed falls below the
value of parameter 21.6 Zero speed
delay function activates. During the delay the function
keeps the speed controller live: the inverter modulates,
motor is magnetized and the drive is ready for a quick
restart. Zero speed delay can be used e.g. with the
jogging function.
Speed
Zero speed delay.
limit, inverter
Speed controller switched off:
Motor coasts to a stop.
21.06
limit, the zero speed
Speed controller remains active.
Motor is decelerated to true zero
speed.
21.06
Time
Delay
Def / Type
FbEq 16b / 32b
0 ms / real32
Time
1 = 1 ms / 1 = 1 ms