Page 62
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
EL 9000 B 15U/24U Series
►
How to load a function
1.
After setting the values for the required signal generation, tap
on the touch area
.
The device will then load the data into the internal controller and
changes the display. Shortly afterwards the static values are set
(power and voltage or current), the DC input is switched on and the
touch area
enabled. Only then can the function be started.
Because the DC input is automatically switched on in order to settle the start situation, the static
values are effective to the source immediately after loading the function. These static values
represent the situation before start and after the end of the function, so it doesn’t need to start
from 0. Only exception: when applying any function to the current (I), there is no adjustable
static current value, so the function would always start from 0 A.
►
How to start and stop a function
1.
The function can be
started
either by tapping
or pushing the On/Off button, if the DC input is
currently switched off. The function then starts immediately. In case START is used while the DC input is
still switched off, it will be switched on automatically.
2.
The function can be
stopped
either by tapping
or pushing the On/Off button. There is different
behaviour:
a) The
button stops only the function, the DC input
remains ON
with the static values in effect.
b) The On/Off button stops the function and switches the DC input off.
Any device alarm (overvoltage, overtemperature etc.), protection (OPP, OCP) or event with
action = Alarm stops the function progress automatically, switches off the DC input and reports
the alarm.
3.10.5
Sine wave function
The following parameters can be configured for a sine wave function:
Value
Range
Description
I(A), U(A)
0...(Nominal value - (Off)) of U, I A = Amplitude of the signal to be generated
I(Off), U(Off)
(A)...(Nominal value - (A)) of U, I Off = Offset, based on the zero point of the mathematical sine
curve, may not be smaller than the amplitude.
f (1/t)
1...10000 Hz
Static frequency of the signal to be generated
Schematic diagram:
Application and result:
Offset
Am
plitud
e
t
U,I
f
Am
plitud
e
A normal sine wave signal is generated and applied to
the selected set value, e.g. current (I). At a constant
input voltage the input current of the load will follow a
sine wave.
For calculating the maximum power input the amplitude
and offset values for the current must be added.
Example: with an input voltage of 15 V and sin(I) select-
ed, set the amplitude to 250 A and the offset to 300 A.
The resulting maximum input power is then achieved at
the highest point of the sine wave and is (300 A + 250 A)
* 15 V = 8.25 kW.
