Nord Drivesystems BU 0500, Руководство пользователя

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8 Additional information
BU 0500 EN-1516 197
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
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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
I
S
= Motor current vector (line current)
I
SD
= Magnetisation current vector (magnetisation current)
I
SQ
= 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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SD
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SQ
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SD
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U
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SD
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