ABB ACQ80-04 Firmware Manual page 94

94 Parameters
No. Name/Value
Const time
Automatic
21.02 Magnetization time
0...10000 ms
21.19 Scalar start mode
Normal
Description
The drive pre-magnetizes the motor before start. The pre-
magnetizing time is defined by parameter
Magnetization time. This mode should be selected if constant
pre-magnetizing time is required (e.g. if the motor start must
be synchronized with the release of a mechanical brake).
This setting also guarantees the highest possible break-away
torque when the pre-magnetizing time is set long enough.
WARNING! The drive will start after the set
magnetizing time has passed even if motor
magnetization is not completed. In applications where
a full break-away torque is essential, ensure that the constant
magnetizing time is long enough to allow generation of full
magnetization and torque.
Automatic start guarantees optimal motor start in most cases.
It includes the flying start function (starting into a rotating
motor) and the automatic restart function. 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.
Note: If parameter 99.04 Motor control mode
no flying start or automatic restart is possible unless
parameter 21.19 Scalar start mode
Defines the pre-magnetization time when
• parameter 21.01 Start mode
motor control mode), or
• parameter 21.19 Scalar start mode
scalar motor control mode).
After the start command, the drive automatically
premagnetizes the motor for the set time. To ensure full
magnetizing, set this parameter 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
< 1 kW
1 to 10 kW
10 to 200 kW
200 to 1000 kW
Note: This parameter cannot be changed while the drive is
running.
Constant DC magnetizing time.
Selects the motor start function for the scalar motor control
mode, ie. when 99.04 Motor control mode
Note: This parameter cannot be changed while the drive is
running.
Immediate start from zero speed.
21.02
is set to Scalar,
is set to Automatic.
is set to Const time (in vector
is set to Const time
Constant magnetizing time
> 50 to 100 ms
> 100 to 200 ms
> 200 to 1000 ms
> 1000 to 2000 ms
is set to Scalar.
Def/FbEq16
1
2
500
(in
1 = 1
Normal
0