Trapezoidal Function; Din 40839 Function - Elektro-Automatik PSI 9000 3U Betriebsanleitung

PSI 9000 3U Series
3.9.8

Trapezoidal function

The following parameters can be configured for a trapezoidal curve function:
Value Range
I(A), U(A) 0...(Nominal value - (Off)) of U, I
I(Off), U(Off) 0...(Nominal value - (A)) of U, I
t1 0.1 ms...36000 s
t2 0.1 ms...36000 s
t3 0.1 ms...36000 s
t4 0.1 ms...36000 s
Schematic diagram:
A
t2 t3 t4
3.9.9

DIN 40839 function

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:
Value Range
Ustart 0...Nominal value of U
Uend 0...Nominal value of U
Seq.time 0.1 ms...36000 s
Seq.cycles ∞ or 1...999
Time t1 0.1 ms...36000 s
Schematic diagram:
A
1 2 3 4
Sequences
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Helmholtzstr. 31-33 • 41747 Viersen
Germany
Description
A = Amplitude of the signal to be generated
Off = Offset, based on the foot of the trapezium
Time for the positive slope of the trapezoidal wave signal.
Time for the top value of the trapezoidal wave signal.
Time for the negative slope of the trapezoidal wave signal.
Time for the base value (offset) of the trapezoidal wave signal
t
t1
Seq Description
1-5 Start voltage of the ramp
1-5 End voltage of the ramp
1-5 Time of the ramp
- Number of repetitions of the entire curve
- Time after cycle before repetition (cycle <> 1)
t
5 t1
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 repetition 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.
Application and result:
The function is not suitable for standalone operation of a
power supply, but optimal for power supply in conjunction
with an electronic load, for example one from ELR 9000
series. 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.
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