ABB ACS880 - Page 294

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
0 ms / real32Defines 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 limit, inverter
modulation is stopped and the motor coasts to a
standstill.
Speed controller switched off:
Motor coasts to a stop.
21.06
Time
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 limit, the 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
Speed controller remains active.
Motor is decelerated to true zero
speed.
Time
21.06
Delay
Zero speed delay21.7
1 = 1 ms / 1 = 1 msZero speed delay.0...30000 ms
294 Parameters