Regenerative power supply modules
Rated data
Current−time diagrams
6
299
EDS94SPP101 EN 10.2
6.3.7 Current−time diagrams
In addition to the data for overcurrent operation within the 5−s cycle or 3−min cycle, here
you are provided with information on the dimensioning of application−oriented cycles.
You can use the following information to find out permissible load periods with
overcurrents and necessary recovery times with limited mains currents. If the thus
determined mains currents and times are adhered to, the Ixt monitoring function for the
protection of devices will not respond.
Characteristics
The following characteristics ("Current−time diagrams") describe the device utilisation via
amperage and the duration of current flow.
The left part of the diagram (negative time data) represents the overload phase, while the
right part of the diagram (positive time data) shows the relieving phase.
Devices with an identical Ixt behaviour are combined within a diagram. A second diagram
enlarges a cutout area to improve the clearness of display.
Requirements
ƒ Mains voltage
In the diagrams, a mains voltage of U
N
= 400 V is assumed. Current derating depending
on the mains voltage is also necessary in the case of the devices. In other words, the
currents are weighted differently in the Ixt monitoring function. The continuous
currents indicated there are then the 100 % values that are needed for working with
the diagrams.
ƒ Ambient temperature
The ambient temperature may be maximally T
Amb
< 45 °C. In the case of higher
ambient temperatures the reduced continuous currents have to be taken into
consideration.
ƒ Regenerative mode/motoring mode
The application example relates to regenerative mode. In motoring mode, the
permissible mains currents are doubled (c.f. rated data).
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