Actual signals and parameters
81
21.01 START FUNCTION Selects the motor starting method. See also section Automatic Start
on page 33.
AUTO Automatic start guarantees optimal motor start in most cases. It
includes the flying start function (starting to a rotating machine) and
the automatic restart function (stopped motor can be restarted
immediately without waiting the motor flux to die away). The drive
motor control program identifies the flux as well as the mechanical
state of the motor and starts the motor instantly under all conditions.
1
DC MAGN DC magnetizing should be selected if a high break-away torque is
required. The drive pre-magnetizes the motor before the start. The
pre-magnetizing time is determined automatically, being typically 200
ms to 2 s depending on the motor size. DC MAGN guarantees the
highest possible break-away torque.
Note: Starting to a rotating machine is not possible when DC
magnetizing is selected.
2
CNST DCMAGN Constant DC magnetizing should be selected instead of DC
magnetizing if constant pre-magnetizing time is required (e.g. if the
motor start must be simultaneous with a mechanical brake release).
This selection also guarantees the highest possible break-away
torque when the pre-magnetizing time is set long enough. The pre-
magnetizing time is defined by 21.02 CONST MAGN TIME.
Note: Starting to a rotating machine is not possible when DC
magnetizing is selected.
WARNING! The drive will start after the set magnetizing time
has passed although the motor magnetization is not
completed. Ensure always in applications where a full break-
away torque is essential, that the constant magnetizing time
is long enough to allow generation of full magnetization and
torque.
3
21.02 CONST MAGN TIME Defines the magnetizing time in the constant magnetizing mode. See
21.01 START FUNCTION. After the start command, ACS800
automatically pre-magnetizes the motor the set time.
30.0…10000.0 ms Magnetizing time. To ensure full magnetizing, 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:
1 = 1 ms
21.03 STOP FUNCTION Selects the motor stop function.
RAMP STOP Stop along a ramp defined by the active deceleration time. See
group 22 ACCEL/DECEL.
0
COAST STOP Stop by cutting off the motor power supply. The motor coasts to a stop. 65535
No. Name/Value Description FbEq
Motor Rated Power Constant Magnetizing Time
< 10 kW >
100 to 200 ms
10 to 200 kW >
200 to 1000 ms
200 to 1000 kW >
1000 to 2000 ms
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