nord NORDAC FLEX SK 2 E-111-123-A Series, Руководство пользователя

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NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
264 BU 0200 en-US-4920
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8.7 Energy efficiency
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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
caused by extremely steep acceleration ramps (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, parameter P219 must
remain in the factory setting (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.
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NORD variable frequency drives have low power consumption and are therefore highly efficient. In
addition, with the aid of automatic magnetization optimization (parameter (P219)) the inverter provides
a possibility for increasing the overall efficiency of the drive in certain applications (in particular
applications with partial load).
Depending on the required torque, the magnetizing current (or the motor torque) is decreased by the
variable frequency drive insofar as necessary for the instantaneous power requirement. The resulting
considerable reduction in power consumption as well as the optimization of the cos
φ
factor to the
motor setpoint even in the partial load range contributes to creating optimum conditions both with
regard to energy consumption and line power characteristics.
A parameterization 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 magnetization optimization With magnetization optimization
Motor under full load Motor under partial load
I
S
= Motor current vector (line current)
I
SD
= Magnetization current vector (magnetization current)
I
load
= Load current vector (load current)
Figure 37: Energy efficiency due to automatic magnetization optimization
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I
load
I
load
I
S
U
I
SD
I
load
I
S
U
I
SD
I
load
I
S
U