ABB ACS 800 Series, Firmware Manual

Page: 74 / 340

Program features
74
Hexagonal motor flux
Typically, the drive controls the motor flux in such a way that the rotating flux vector
follows a circular pattern. This is ideal in most applications. When operated above
the field weakening point (FWP, typically 50 or 60 Hz), it is, however, not possible to
reach 100% of the output voltage. The peak load capacity of the drive is lower than
with the full voltage.
If hexagonal flux control is selected, the motor flux is controlled along a circular
pattern below the field weakening point, and along a hexagonal pattern in the field
weakening range. The applied pattern is changed gradually as the frequency
increases from 100% to 120% of the FWP. Using the hexagonal flux pattern, the
maximum output voltage can be reached; The peak load capacity is higher than with
the circular flux pattern but the continuous load capacity is lower in the frequency
range of FWP to 1.6
·
FWP, due to increased losses.
Settings
Parameter 26.05 .
Programmable protection functions
AI<Min
AI<Min function defines the drive operation if an analogue input signal falls below the
preset minimum limit.
Settings
Parameter 30.01 .
Panel loss
Panel loss function defines the operation of the drive if the control panel selected as
control location for the drive stops communicating.
Settings
Parameter 30.02 .
External fault
External faults can be supervised by defining one digital input as a source for an
External fault indication signal.
Settings
Parameter 30.03 .