Danfoss FC 300 Programming Manual page 6

Introduction
1 1
Trip
A state entered in fault situations, e.g. if the frequency
converter is subject to an over-temperature or when the
frequency converter is protecting the motor, process or
mechanism. Restart is prevented until the cause of the fault
has disappeared and 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.
Trip Locked
A state entered in fault situations when the frequency convert-
er is protecting itself and requiring physical intervention, e.g. if
the frequency converter is subject to a short circuit on the
output. A locked trip can only be cancelled by cutting off
mains, removing the cause of the fault, and reconnecting the
frequency converter. 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
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVC
the stability, both when the speed reference is changed and in
relation to the load torque.
60° AVM
Switching pattern called 60°Asynchronous Vector Modulation
(par. 14-00 Switching Pattern).
Power Factor
The power factor is the relation between I
Power factor =
The power factor for 3-phase control:
I x cos
1 ϕ1
= =
I RMS
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
kW performance.
2 +
I RMS I I
=
1
In addition, a high power factor indicates that the different
harmonic currents are low.
The frequency converters' built-in DC coils produce a high
power factor, which minimizes the imposed load on the mains
supply.
6
plus
) improves the dynamics and
1
x U x I cos
3 ϕ
1
x U x I RMS
3
I
1
since cos
ϕ1 = 1
I RMS
2 + 2 + .. + 2
I I n
5 7
MG.33.M9.02 - VLT
FC 300 Programming Guide
The voltage of the frequency converter is dangerous
whenever connected to mains. Incorrect installation of
the motor, frequency converter or fieldbus may cause
death, serious personal injury or damage to the
equipment. Consequently, the instructions in this
manual, as well as national and local rules and safety
regulations, must be complied with.
Safety Regulations
1.
2.
3.
4.
5.
6.
and I .
RMS
7.
for the same
RMS
®
is a registered Danfoss trademark
The mains supply to the frequency converter must
be disconnected whenever repair work is to be
carried out. Check that the mains supply has been
disconnected and that the necessary time has
elapsed before removing motor and mains supply
plugs.
The [OFF] button on the control panel of the
frequency converterr does not disconnect the mains
supply and consequently it must not be used as a
safety switch.
The equipment must be properly earthed, the user
must be protected against supply voltage and the
motor must be protected against overload in accord-
ance with applicable national and local regulations.
The earth leakage current exceeds 3.5 mA.
Protection against motor overload is not included in
the factory setting. If this function is desired, set
par. 1-90 Motor Thermal Protection to data value ETR
trip 1 [4] or data value ETR warning 1 [3].
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
elapsed before removing motor and mains plugs.
Please note that the frequency converter has more
voltage sources than L1, L2 and L3, when load
sharing (linking of DC intermediate circuit) or
external 24 V DC are installed. Check that all voltage
sources have been disconnected and that the
necessary time has elapsed before commencing
repair work.