Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9250-140 3U Electronic Load 0 - 140 A 0 - 250 Vdc 0 - 7000 W 33200406 データシート

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EA Elektro-Automatik GmbH

Helmholtzstr. 31-33 • 41747 Viersen

Germany

Fon: +49 2162 / 3785-0

Fax: +49 2162 / 16230

The following parameters can be configured for a trapezoidal curve function:

I(A), U(A)

0...(Nominal value - (Off)) of U, I

A = Amplitude of the signal to be generated

I(Off), U(Off) 0...(Nominal value - (A)) of U, I

Off = Offset, based on the foot of the trapezium

t1

0.1 ms...36000 s

Time for the negative slope of the trapezoidal wave signal

t2

0.1 ms...36000 s

Time for the top value of the trapezoidal wave signal

t3

0.1 ms...36000 s

Time for the negative slope of the trapezoidal wave signal

t4

0.1 ms...36000 s

Time for the base value (offset) of the trapezoidal wave signal

Schematic diagram:

Application and result:

Here a trapezoidal signal can be applied to a set value 

of U or I. The slopes of the trapezium can be different 

by setting different times for gain and decay. 
The periodic duration and repeat frequency are the 

result of four time elements. With suitable settings the 

trapezium can be deformed to a triangular or rectangular 

wave. It has, therefore, universal use.

This function is based on the curve defined in DIN 40839 / EN ISO 7637 (test impulse 4), and is only applicable 

to voltage. It shall replicate the progress of automobile battery voltage during engine starting. The curve is divided 

into 5 sequences (see diagram below) which each have the same parameters. The standard values from the DIN 

are set already as default values for the five sequences.
The following parameters can be configured for the DIN40839 function:

Ustart

0...Nominal value of U 1-5

Start voltage of the ramp

Uend

0...Nominal value of U 1-5

End voltage of the ramp

Seq.time

0.1 ms...36000 s

1-5

Time of the ramp

Seq.cycles ∞ or 1...999

-

Number of repetitions of the entire curve

Time t1

0.1 ms...36000 s

-

Time after cycle before repetition (cycle <> 1)

Schematic diagram:

Application and result:

The function is not suitable for standalone operation of 

an electronic load, but optimal for an electronic load in 

conjunction with a compatible power supply, e.g. from 

the PS 9000 3U series, which is controlled by the load 

via Share Bus (see power supply device manual and 

„3.10.3. Two quadrants operation (2QO)“). The load 

acts as a sink for the rapid fall of the output voltage of 

the power supply enabling the output voltage progress 

to follow the DIN curve.
The curve conforms to test impulse 4 of the DIN. With 

suitable settings, other test impulses can be simulated. 

If the curve in sequence 4 should be a sine wave, then 

these 5 sequences have to be transferred to the arbitrary 

generator.