ABB ACS850 User Manual

166 Parameters
19.07 Zero speed delay 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
accurately the rotor position.
Without Zero Speed Delay:
The drive receives a stop command and decelerates along
a ramp. When the motor actual speed falls below the value of
parameter 19.06 Zero speed limit, the speed controller is
switched off. The inverter modulation is stopped and the
motor coasts to standstill.
With Zero Speed Delay:
The drive receives a stop command and decelerates along a
ramp. When the actual motor speed falls below the value of
parameter 19.06 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.
0 … 30000 ms Zero speed delay. 1 = 1 ms
19.08 Above speed lim Defines the supervision limit for the actual speed. See also
parameter 02.13 FBA main sw, bit 10.
0 … 30000 rpm Actual speed supervision limit. 1 = 1 rpm
No. Name/Value Description FbEq
Speed controller switched off:
Motor coasts to stop.
19.06 Zero speed limit
Speed
Time
Speed controller remains
active. Motor is decelerated to
true zero speed.
19.06 Zero speed limit
Speed
Time
Delay

ABB ACS850 Specifications

General

Safety	STO (Safe Torque Off)
Communication	CANopen
Enclosure	IP21
Output Voltage	Up to 1000 V DC
Protection Features	Overcurrent, Overvoltage, Undervoltage
Cooling Method	Air or liquid cooling
Input Voltage	380 to 690 V AC