Standard programposi features 77
DC magnetization
DC magnetization can be applied to the motor to lock the rotor at or near zero speed.
Pre-magnetization
Pre-magnetization refers to DC magnetization of the motor before start. Depending
on the selected start mode (
), pre-magnetization is applied to
guarantee the highest possible breakaway torque, up to 200% of the nominal torque
of the motor. By adjusting the pre-magnetization time (
), it is
possible to synchronize the motor start.
DC hold
The function makes it possible to lock the rotor at or near zero speed in the middle of
normal operation. DC hold is activated by parameter
. When
both the reference and motor speed drop below a certain level (parameter
), the drive stops generating sinusoidal current and start to inject DC into
the motor. The current is set by parameter
. When the
reference exceeds parameter
, normal drive operation
continues.
Note:
• DC hold is only available in speed control.
• The function applies the DC current to one phase only, depending on the position
of the rotor. The return current will be shared between the other phases.
Post-magnetization
This feature keeps the motor magnetized for a certain period (parameter
) after stopping to prevent the machinery from moving under load.
Post-magnetization is activated by parameter
. The
magnetization current is set by parameter
.
Reference
Motor speed
DC hold
t
t
Summary of Contents for ACS880 PCP
Page 1: ...ABB industrial drives Firmware manual ACS880 PCP ESP control program ...
Page 4: ......
Page 28: ...28 PCP ESP control start up ...
Page 30: ...30 Using the control panel ...
Page 94: ...94 Standard programposi features ...
Page 100: ...100 Default control connections ...
Page 360: ...360 Parameters ...
Page 436: ...436 Fault tracing ...
Page 486: ...486 Control chain diagrams ...
Page 492: ...492 Appendix ESP with step up transformer and sine filter ...
Page 494: ...Contact us www abb com drives www abb com drivespartners 3AXD50000016186 Rev B EN 2015 10 27 ...