FC 300 Design Guide
How to Read this Design Guide
Trip-Loc ked
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 fre que ncy 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.
V
T Characteri stics
Variable torque characteristics us ed for pumps and fans.
V
VC
plus
Compared w ith standard voltage/ frequency ratio control, Voltage Vector Control (VVC
plus
)improvesthe
dynamics a n d the stability, both when the speed reference is changed and in relation to the load torque.
6
0° AVM
Switching pattern called 60° A synchronous V ector M odulation (par. 14-00).
" Power Factor
The power factor is the relation between I
1
and I
RMS
.
The power factor for 3-phase control:
The power factor indicates to what extent
theadjustablefrequencydriveimposesa
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 d rives’ built-in DC coils produce a high pow er factor,
which minim izes the imposed load on the mains supply.
11
MG.33.B6.22 - VLT is a registered Danfoss trademark
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