Danfoss FC 300

The power factor indicates to which extent the
frequency converter imposes a load on the
mains supply.
The lower the power factor, the higher the
I
RMS
for the same kW performance.
I
RMS
= I
1
2
+ I
5
2
+ I
7
2
+.. + I
n
2
In addition, a high power factor indicates that the different harmonic currents are low.
The FC 300 frequency converters' built-in DC coils produce a high power factor, which minimizes
the imposed load on the mains supply.
The voltage of the frequency converter is dangerous whenever connected to mains.
Incorrect installation of the motor, frequency converter or fieldbus may cause dam-
age to the equipment, serious personal injury or death. Consequently, the instruc-
tions in this manual, as well as national and local rules and safety regulations, must
be complied with.
Safety Regulations
1. The frequency converter must be disconnected from mains if repair work is to be carried
out. Check that the mains supply has been disconnected and that the necessary time has
passed before removing motor and mains plugs.
2. The [STOP/RESET] key on the control panel of the frequency converter does not dis-
connect the equipment from mains and is thus not to be used as a safety switch.
3. Correct protective earthing of the equipment must be established, the user must be pro-
tected against supply voltage, and the motor must be protected against overload in
accordance with applicable national and local regulations.
4. The earth leakage currents are higher than 3.5 mA.
5. Protection against motor overload is not included in the factory setting. If this function
is desired, set par. 1-90 to data value ETR trip or data value ETR warning.
6. Do not remove the plugs for the motor and mains supply while the frequency converter
is connected to mains. Check that the mains supply has been disconnected and that the
necessary time has passed before removing motor and mains plugs.
7. Please note that the frequency converter has more voltage inputs than L1, L2 and L3,
when load sharing (linking of DC intermediate circuit) and external 24 V DC have been
installed. Check that all voltage inputs have been disconnected and that the necessary
time has passed before commencing repair work.
FC 300 Programming Guide 1. Introduction
MG.33.M2.02 - VLT
®
is a registered Danfoss trademark 9
1