Power Factor - Danfoss FC 300 Design Manual

FC 300 Design Guide
How to Read this Design Guide
Trip-Locked
A state entered in fault situations when the adjustable frequency drive is protecting itself and requiring
physical intervention, e.g. if the adjustable frequency drive is subject to a short circuit on the output. A
locked trip can only be cancelled by cutting off AC line, removing the cause of the fault, and reconnecting the
adjustable frequency drive. Restart is prevented until the trip state is cancelled by activating reset or, in
some cases, by being programmed to reset automatically. Trip may not be used for personal safety.
VT Characteristics
Variable torque characteristics used for pumps and fans.
plus
VVC
Compared with standard voltage/frequency ratio control, Voltage Vector Control (VVC plus ) improves the
dynamics and the stability, both when the speed reference is changed and in relation to the load torque.
60° AVM
Switching pattern called 60° A synchronous V ector M odulation (par. 14-00).

Power Factor

"
The power factor is the relation between I and I .
1 RMS
The power factor for 3-phase control:
The power factor indicates to what extent
the adjustable frequency drive imposes a
load on the mains supply.
The lower the power factor, the higher the I
RMS
for the same HP/kW performance.
In addition, a high power factor indicates that the different harmonic currents are low.
The FC 300 adjustable frequency drives' built-in DC coils produce a high power factor,
which minimizes the imposed load on the mains supply.
11
MG.33.B6.22 - VLT is a registered Danfoss trademark