NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
78 BU 0250 en-3021
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 inadequate dimensioning 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 equipment).
To prevent any risk, the following must be observed:
• For lifting equipment applications or applicati
ons with frequent large load changes, parameter
P219 must remain in the factory setting (100 %).
• Do not inadequately dimension the drive unit, provide adequate overload reserves.
• If necessary, provide fall protection (e.g. for lifting equipment) or equivalent protective measures.
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The relevant parameters for the device are described in the following. The parameters are accessed
using a parametrisation tool (e.g. NORDCON software or control and parametrisation unit, see also
( Section 3.2 "Control and parametrisation options ") and therefore makes it possible to adapt the
device to the drive task in the best possible way. Different device configurations can result in
dependencies for the relevant parameters.
The parameters can only be accessed if the control unit of the device is active.
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Depending on the configuration of the inverter, the control voltage can be supplied via an optional plug
connector. Alternatively, the inverter can be equipped with a mains unit (option: "-HVS"), which
generates the necessary 24 V DC control voltage when connected to the mains voltage (see
Section 2.3.2 "Electrical connection of power unit").
Each inverter is pre-configured for a NORD motor with the same output power at the factory. All
parameters can be adjusted "online". Four switchable parameter sets are available during operation.
The scope of the parameters to be displayed can be influenced using the supervisor parameter P003.
The factory settings of parameter P420 depend on the configuration of the inverter ( Section 2.2.2.3
"Configuration of option slots on the connection level").
The relevant parameters for the inverter are described below. Explanation of parameters which relate
to the field bus options or special functionality can be found in the respective supplementary manuals.
The SK PAR-3H ParameterBox must have at least software version 4.6 R1.
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