ABB ACS 800 Series, Firmware Manual

Page: 66 / 340

Program features
66
Motor identification
The performance of Direct torque control is based on an accurate motor model
determined during the motor start-up.
A motor identification magnetisation is automatically done the first time the start
command is given. During this first start-up, the motor is magnetised at zero speed
for several seconds to allow the motor model to be created. This identification
method is suitable for most applications.
In demanding applications a separate identification run can be performed.
Settings
Parameter 99.10 MOTOR ID RUN MODE
• ID MAGN: Identification with the motor at a standstill and the mechanical brake
closed.
• STANDARD: Identification with a rotating motor and the mechanical brake open.
Diagnostics
Actual signal 03.03 .
• Bit 6: First start not done.
• Bit 7: STANDARD ID run done.
Start function: Constant DC magnetising
When DC magnetising is activated, the drive automatically magnetises the motor
before starting. This feature guarantees the highest possible breakaway torque, up
to 200% of motor nominal torque. In crane applications, this parameter is fixed to
constant DC magnetising (CNST DC MAGN).
Settings
Parameters 21.01 and 21.02 .
DC hold
By activating the motor DC hold feature, you can lock the
rotor at zero speed. When both the reference and the
motor speed fall below the preset DC hold speed, the
drive stops the motor and starts to inject DC into the
motor. When the reference speed again exceeds the DC
hold speed, the normal drive operation resumes.
Settings
Parameters 21.04 , 21.05 , and 21.06 .
DC hold
t
Motor
DC hold
speed
DC hold
speed
t
Speed
Reference
Speed