Danfoss VLT HVAC Basic Drive Programming Manual page 10

Introduction
Set-up
You can save parameter settings in two Set-ups. Change
between the two parameter Set-ups and edit one Set-up,
while another Set-up is active.
Slip Compensation
The frequency converter compensates for the motor slip by
giving the frequency a supplement that follows the
measured motor load keeping the motor speed almost
constant.
Slip compensation is default set to off.
Smart Logic Control (SLC)
The SLC is a sequence of user defined actions executed when
the associated user defined events are evaluated as true by
the Smart Logic Controller. (Par. group 13-** Smart Logic
Control (SLC).)
STW
Status Word
FC Standard Bus
Includes RS-485 bus with FC 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 Lock
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 automat-
ically. 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
the stability, both when the speed reference is changed and
in relation to the load torque.
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
VLT HVAC Basic Drive Programming Guide
) improves the dynamics and
and I .
1 RMS
®
MG.18.B1.02 - VLT is a registered Danfoss trademark
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
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.
The frequency converters' 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. 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.
2. The [OFF] button on the control panel of the
frequency converter 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 3.5mA.
5. Protection against motor overload is not included
in the factory setting. If this function is desired, set
1-90 Motor Thermal Protection to data value ETR trip
1 [4] or data value ETR warning 1 [3].
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. Please note that the frequency converter has more
voltage sources than L1, L2 and L3, when load
1 1
for the same
RMS
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