User manual

Page 48
EA Elektro-Automatik GmbH
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EL 3000 B Series
3.9.7 Trapezoidal function
Thefollowingparameterscanbeconguredforatrapezoidalcurvefunction:
Value Range Description
Ampl. 0...(Rated value - Offset)) of U or I Ampl. = Amplitude of the signal to be generated
Offset 0...(Rated value - Ampl) of U or I Offset, based on the foot of the trapezium
t1 0.01 ms...6000 s Time for the negative slope of the trapezoidal wave signal
t2 0.01 ms...6000 s Time for the top value of the trapezoidal wave signal
t3 0.01 ms...6000 s Time for the negative slope of the trapezoidal wave signal
t4 0.01 ms...6000 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 rise and fall.
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 values for t1
not every adjustable amplitude can be gained
on the DC input. Rule of thumb: the smaller
the time value, the lower the true amplitude.
3.9.8 Ramp function
Thefollowingparameterscanbeconguredforarampfunction.
Value Range Description
Start 0...Nominal value of U, I Start level of the ramp
End 0...Nominal value of U, I End level of the ramp,
t1 0.01 ms...36000 s Time before ramp-up or ramp-down of the signal.
Schematic diagram: Application and result:
Start
t
A
t1
End
This function generates a rising or falling ramp between start and
end values over the time t1.
The function runs once and stops at the end value. To have a
repeating ramp, function Trapezoid would have to be used instead
(see 3.9.7).
ImportanttoconsideristhestaticvalueofUorIwhichdenesthe
static level before actually starting the ramp. It is recommended
that this value is set equal to the value “Start”.