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. (Parameter group 13-**
Smart Logic Control (SLC).
STW
Status Word
Adjustable Frequency Drive 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 (adjustable frequency drive
or motor).
Trip
A state entered in fault situations, e.g., if the adjustable
frequency drive is subject to an overtemperature or when
the adjustable frequency drive is protecting the motor,
process or mechanism. Restart is prevented until the cause
of the fault has disappeared and the trip state is canceled
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 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 canceled by cutting off line power, removing the
cause of the fault, and reconnecting the adjustable
frequency drive. Restart is prevented until the trip state is
canceled 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.
VVCplus
If compared with standard voltage/frequency ratio control,
Voltage Vector Control (VVCplus ) improves the dynamics
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 I1and IRMS.
Power
factor
=
3
x
U
x
I
1
cos
ϕ
3
x
U
x
IRMS
The power factor for 3-phase control:
=
I
1
x
cos
ϕ1
IRMS
=
I
1
IRMS
since
cos
ϕ1 = 1
The power factor indicates to which extent the adjustable
frequency drive imposes a load on the line power supply.
The lower the power factor, the higher the IRMS for the
same kW [hp] performance.
IRMS
=
I
1
2 +
I
5
2 +
I
7
2 + .. +
In
2
In addition, a high power factor indicates that the different
harmonic currents are low.
The built-in DC coils produce a high power factor, which
minimizes the imposed load on the line power supply.
WARNING
The voltage of the adjustable frequency drive is dangerous
whenever connected to line power. Incorrect installation of
the motor, adjustable frequency drive or serial communi-
cation bus 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 line power supply before carrying
out repair work. Make sure that the line power
supply has been disconnected and that the
necessary time has elapsed before removing
motor and line power supply plugs.
2. The [Off] key on the LCP does not disconnect the
line power supply and consequently it must not
be used as a safety switch.
3. The equipment must be properly grounded, 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 ground 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 line
power supply while the adjustable frequency
Introduction VLT®AQUA Drive Programming Guide
1-4 MG20O622 - VLT®is a registered Danfoss trademark
11
