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Program features 143
Custom U/f ratio
The user can define a U/f curve (output voltage as a function of frequency). This
custom ratio is used only in special applications where linear and squared U/f ratio
are not sufficient (eg, when motor break-away torque needs to be boosted).
Note:
The U/f curve can be used in scalar control only, ie, when
setting is
.
Note:
The voltage and the frequency points of the U/f curve must fulfill the following
requirements:
<
<
<
<
WARNING!
High voltage at low frequencies may result in poor performance or
motor damage (overheating).
Settings
Diagnostics
Parameter
Additional information
Custom U/f ratio activation
Custom U/f ratio settings
Fault
Additional information
Incorrect U/f ratio
f
(Hz)
Custom U/f ratio
Voltage
(V)
Par.
Par.
Par.
Par.
Par.
Par.
Par.
Par.
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...