NORDAC BASE (SK 180E / SK 190E) – Users Manual for Frequency Inverters
194
BU 0180 en-4118
8.7 Energy Efficiency
WARNING
Unexpected movement due to overload
In case of overload of the drive there is a risk that the motor will "break down" (= sudden loss of torque). An
overload may be caused e.g. by underdimensioning of the drive unit or by the occurrence of sudden peak loads.
Sudden peak loads may be of a mechanical origin (e.g. blockage) or may be due to extremely steep acceleration
ramps (Parameter
P102
,
P103
,
P426
).
Depending on the type of application, "breakdown" of the motor may cause unexpected movement (e.g. dropping
of loads by lifting gear).
To prevent any risk, the following must be observed:
• For lifting gear applications or applications with frequent, large load changes, the parameter (
P219
) must
remain in the factory (
100 %
).
• Do not underdimension the drive unit, provide adequate overload reserves.
• If necessary, provide fall protection (e.g. for lifting gear) or equivalent protective measures.
NORD frequency inverters have a low power consumption and are therefore highly efficient. In
addition, with the aid of "Automatic flux optimisation" (Parameter (P219)) the inverter provides a
possibility for increasing the overall efficiency of the drive in certain applications (in particular
applications with partial load).
According to the torque required, the magnetisation current through the frequency inverter or the
motor torque is reduced to the level which is required for the momentary drive power. The resulting
considerable reduction in power consumption, as well as the optimisation of the cos
φ
factor of the
motor rating in the partial load range contributes to creating optimum conditions both with regard to
energy consumption and mains characteristics.
A parameterisation which is different from the factory setting (Factory setting = 100%) is only
permissible for applications which do not require rapid torque changes. (For details, see Parameter
(P219))
No flux optimisation
With flux optimisation
Motor under full load
Motor under partial load
I
S
=
Motor current vector (line current)
I
SD
=
Magnetisation current vector (magnetisation current)
I
SQ
=
Load current vector (load current)
Figure 20: Energy efficiency due to automatic flux optimisation
I
SD
I
SQ
I
S
U
I
SD
I
SQ
I
S
U
I
SD
I
SQ
I
S
U
Summary of Contents for SK 180E Series
Page 1: ...BU 0180 en NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters...
Page 4: ...NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters 4 BU 0180 en 4118...
Page 185: ...8 Additional information BU 0180 en 4118 185 8 3 4 EU Declaration of Conformity...
Page 211: ...Key word index BU 0180 en 4118 211...
Page 212: ...6071802 4118...
