Start/Stop - ABB ACS800 Firmware Manual

Index Name/Selection

21 START/STOP

21.01 START FUNCTION
CNST DC MAGN
21.02 CONST MAGN TIME
30.0 ... 10000.0 ms
21.03 STOP FUNCTION
COAST
RAMP
Description
Start and stop modes of the motor.
Selects the motor starting method.
In special crane applications like slew-motion cranes, its possible to enable the
auto start function mode. For more information, contact your local ABB
representative.
In the crane applications, this parameter is fixed to CNST DC MAGN. Constant
DC magnetising is needed when constant pre-magnetising time is required
(For example, if the motor start must be simultaneous with a mechanical brake
release). CNST DC MAGN also guarantees the highest possible break-away
torque when the pre-magnetising time is set long enough. The pre-magnetising
time is defined with parameter 21.02.
Note: Starting to a rotating machine is not possible when DC magnetising is
selected.
Note: DC magnetising cannot be selected if parameter
WARNING! The drive will start after the set magnetising time has
passed although the motor magnetisation is not completed. Ensure
always in applications where a full break-away torque is essential, that
the constant magnetising time is long enough to allow generation of full
magnetisation and torque.
Defines the magnetising time in the constant magnetising mode. See
parameter 21.01. After the Start command, the drive automatically pre-
magnetises the motor the set time.
Magnetising time. To ensure full magnetising, set this value to the same value
as or higher than the rotor time constant. If not known, use the rule-of-thumb
value given in the table below:
Motor Rated Power
< 10 kW
10 to 200 kW
200 to 1000 kW
Selects the motor stop function.
Stop by cutting of the motor power supply. The motor coasts to a stop.
WARNING! If the mechanical brake control function is on, the
application program uses ramp stop in spite of the selection COAST
(see parameter group
Stop along a ramp. See parameter group
99.04
Constant Magnetising Time
> 100 to 200 ms
> 200 to 1000 ms
> 1000 to 2000 ms
42 BRAKE CONTROL).
22 ACCEL/DECEL.
Actual signals and parameters
177
FbEq
3
= SCALAR.
30 ... 10000
1
2