Danfoss VLT AQUA Drive FC 200 Programming Manual page 8

Introduction
FC Standard Bus
Includes RS-485 bus with FC protocol or MC protocol. See
8-30 Protocol.
Thermistor
A temperature-dependent resistor placed where the
temperature is to be monitored (frequency converter or
motor).
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
converter 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 plus
and 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 (14-00 Switching Pattern).
Power Factor
The power factor is the relation between I
x U x I 1 cos ϕ
3
Power factor =
3 x U x I RMS
The power factor for 3-phase control:
I 1
I 1 x cos ϕ1
= = since cos ϕ1 = 1
I RMS 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
same kW performance.
I 1 2 + I 5 2 + I 7 2 + .. + I n 2
I RMS =
In addition, a high power factor indicates that the different
harmonic currents are low.
®
VLT AQUA Drive Programming Guide
) improves the dynamics
and I .
1 RMS
for the
RMS
®
MG20O602 - VLT is a registered Danfoss trademark
The built-in DC coils produce a high power factor, which
minimizes the imposed load on the mains supply.
WARNING
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. Disconnect the mains supply before carrying out
repair work. Check that the mains supply has
been disconnected and that the necessary time
has elapsed before removing motor and mains
supply plugs.
2. The [Off] key on the LCP does not disconnect the
mains supply and consequently it must not be
used as a safety switch.
3. The equipment must be properly earthed, the
user must be protected against supply voltage
and the motor must be protected against
overload in accordance with applicable national
and local regulations.
4. The earth leakage current exceeds 3.5 mA.
5. Protection against motor overload: If this function
is desired, set 1-90 Motor Thermal Protection for
example to data value ETR trip 1 or data value
ETR warning 1.
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 elapsed before removing motor and
mains plugs.
7. 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.
Warning against unintended start
1. The motor can be brought to a stop with digital
commands, bus commands, references or a local
stop, while the frequency converter is connected
to mains. If personal safety considerations (e.g.
risk of personal injury caused by contact with
moving machine parts following an unintentional
start) make it necessary to ensure that no
unintended start occurs, these stop functions are
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