ABB ACQ80-04 User Manual

94 Parameters
Const time The drive pre-magnetizes the motor before start. The pre-
magnetizing time is defined by parameter 21.02
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.
1
Automatic 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 is set to Scalar,
no flying start or automatic restart is possible unless
parameter 21.19 Scalar start mode is set to Automatic.
2
21.02 Magnetization time Defines the pre-magnetization time when
• parameter 21.01 Start mode is set to Const time (in vector
motor control mode), or
• parameter 21.19 Scalar start mode is set to Const time (in
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:
Note: This parameter cannot be changed while the drive is
running.
500
0…10000 ms Constant DC magnetizing time. 1 = 1
21.19 Scalar start mode Selects the motor start function for the scalar motor control
mode, ie. when 99.04 Motor control mode is set to Scalar.
Note: This parameter cannot be changed while the drive is
running.
Normal
Normal Immediate start from zero speed. 0
No. Name/Value Description Def/FbEq16
Motor rated power Constant magnetizing time
< 1 kW >
50 to 100 ms
1 to 10 kW >
100 to 200 ms
10 to 200 kW >
200 to 1000 ms
200 to 1000 kW >
1000 to 2000 ms
ACQ80 FW.book Page 94 Thursday, February 14, 2019 11:33 AM

ABB ACQ80-04 Specifications

General

Brand	ABB
Model	ACQ80-04
Category	DC Drives
Language	English