nord NORDAC PRO SK 511E Series - Reduced Output Current Due to the Heat Sink Temperature; Operation with FI Circuit Breakers; Energy Efficiency; Figure 19: Energy Efficiency Due to Automatic Flux Optimisation

8 Additional information
BU 0505 EN-3021 201
Pos: 507 /Anleitungen/ Elektronik/F U und Starter/9. Zusatzinf ormationen [BU 0500 / BU 0200] /Reduzierte Ausgangs leistung/_Reduzi erter Ausgangsstr om aufgrund der Kühlkör pertemperatur @ 0\mod_132 8189183973_388.doc x @ 14397 @ 3 @ 1
8.4.5 Reduced output current due to the heat sink temperature
The temperature of the heat sink in included in the calculation of the reduction of output current, so
that at low heat sink temperatures, a higher load capacity can be permitted, especially for higher pulse
frequencies. At high heat sink temperatures, the reduction is increased correspondingly. The ambient
temperature and the ventilation conditions for the device can therefore be optimally exploited.
Pos: 508 /Anleitungen/ Elektronik/F U und Starter/9. Zusatzinf ormationen [BU 0500 / BU 0200] /Betrieb am FI-Sc hutzschalter [SK 5xxE] @ 0\mod_1328 189221206_388.doc x @ 14420 @ 2 @ 1
8.5 Operation with FI circuit breakers
SK 5xxE frequency inverters are designed for operation with a 30mA all-current sensitive FI circuit
breakerFI circuit breaker. If several frequency inverters are operated on a single FI circuit breaker, the
leakage currents to earth must be reduced. For further details, please refer to Section 2.9.2.
Pos: 509 /Anleitungen/ Elektronik/F U und Starter/9. Zusatzinf ormationen [BU 0500 / BU 0200] /Energieeffizienz [SK 1x0E, SK 2 xxE, SK 5xxE] @ 0\mod_1328189266800_388. docx @ 14443 @ 2 @ 1
8.6 Energy Efficiency
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
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=
Motor current vector (line current)
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= Magnetisation current vector (magnetisation current)
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=
Load current vector (load current)
Figure 19: Energy efficiency due to automatic flux optimisation
WARNING
Overload
This function is not suitable for lifting gear applications or applications with frequent, large load changes, and the
factory setting (100%) of parameter (P219) must not be changed. If this is not observed, there is a danger that
the motor will break down in a sudden peak load occurs.
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