Elektro-Automatik PSI 9000 DT Series, Руководство по эксплуатации

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Page 65
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de
PSI 9000 DT Series
3.10.8 Trapezoidal function
The following parameters can be configured for a trapezoidal curve function:
Value Range Description
I(A), U(A) 0...(Nominal value - (Offs)) of U, I A = Amplitude of the signal to be generated
I(Offs), U(Offs) 0...(Nominal value - (A)) of U, I Offs = Offset, based on the foot of the trapezium
t1 0.1 ms...36000 s Time for the positive 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:
O
ffset
t
U,I
A
m
plit
ud
e
t1 t2 t3 t4
O
ffset
t
U,I
A
m
plit
ud
e
t1 t2 t3 t4
Here a trapezoidal signal can be applied to a set value
of U or I. The slopes of the trapezium can be varied by
setting different times for the rising and falling edge.
The sum of t1, t2, t3 and t4 results in the cycle time or
periodic duration and its reciprocal is the frequency.
With suitable settings the trapezium can be deformed
to a triangular or rectangular wave. It has, therefore,
universal use.
3.10.9 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 the automobile battery voltage during engine starting. The curve is divided
into 5 parts (see diagram below) which each have the same set of parameters. The standard values from the DIN
are already set as default values for the five sequences.
The following parameters can be configured for the DIN40839 function:
Value Range Seq Description
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:
t
U
U
st
ar
t
1 2 3 4 5 t1
Sequence points
The function isn’t suitable for standalone operation of a
power supply, but optimal for a power supply in conjunc-
tion with an electronic load,such as one from EL 9000
DT 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 part in sequence point 4 should be a sine
wave, then the function and its 5 sequence points would
have to be transferred to the arbitrary generator.