User manual

Page 54
EL 9000 T Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
3.10.8 Trapezoidal function
Thefollowingparameterscanbeconguredforatrapezoidalcurvefunction:
Value Range Description
Ampl. 0...(Nominal value - Offset) of U, I Amplitude of the signal to be generated
Offset Ampl...(Nominal value - Ampl.) of U, I Offset of the foot of the trapezoidal wave against 0
t1 0.01 ms...36000 s Time for the negative slope of the trapezoidal wave signal
t2 0.01 ms...36000 s Time for the top value of the trapezoidal wave signal
t3 0.01 ms...36000 s Time for the negative slope of the trapezoidal wave signal
t4 0.01 ms...36000 s Time for the base value (offset) of the trapezoidal wave signal
Schematic diagram: Application and result:
Offset
t
A
Amplitude
t1t2 t3 t4
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.
When adjusting very short time val-
ues for t1 not every adjustable ampli-
tude can be gained on the DC input.
Rule of thumb: the smaller the time
value, the lower the true amplitude.
3.10.9 Ramp function
Thefollowingparameterscanbeconguredforarampfunction.
Value Range Description
Start 0...Nominal value of U, I Start value (U,I)
End 0...Nominal value of U, I End value (U, I)
t1 0.01 ms...36000 s Time before ramp-up or ramp-down of the signal.
t2 0.01 ms...36000 s Ramp-up or ramp-down time
Schematic diagram: Application and result:
Start
t
A
t1 t2
End
This function generates a rising or falling ramp between start
and end values over the time t2. Time t1 creates a delay before
the ramp starts.
The function runs once and stops at the end value. The function
runs once and stops at the end value. To have a repeating ramp,
function Trapezoid would have to be used instead (see 3.10.8).
ImportanttoconsiderarethestaticvaluesofUandIwhichdene
the start levels at the beginning of the ramp. It is recommended
that these values are set equal to the one in set for “Start”, unless
the power source shall not be loaded before the start of the ramp.
In that case the static values should be set to zero.
10h after reaching the ramp end, the function
will stop automatically (i.e. I = 0 A resp. U =
0 V), unless it has been stopped manually
before.