© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
3.11.2.3 Resolution
Amplitudes generated by the arbitrary generator have an effective resolution of approx. 52428 steps. If the amplitude is very
low and the time long, the device would generate less steps and set multiple identical values after another, generating a stair-
case effect. It’s furthermore not possible to generate every possible combination of time and a varying amplitude (slope).
3.11.2.4 Possible technical complications
Operation of switching mode power supplies as a voltage source can, when applying a function to the output voltage, lead to
damage of the output capacitors due to continuous charging/discharging which causes overheating.
3.11.2.5 Minimum slope / maximum ramp time
Removed since release of KE 3.02 and DR 1.0.2.20 (newer production dates from 03/2022) and 1.0.9 (older production dates
until approx. 01/2022.
Ramps or mixed AC/DC functions where the DC offset varies from start to end don’t have a minimum slope anymore. The
time of a sequence point can now use the full 36000 seconds.
3.11.3
Method of operation
In order to understand how the function generator works and how the values interact, the following should be noted:
The device always works with the three set values U, I and P, also in function generator mode.
The selected function can be used on one set value, U or I, while the other two values are constant and have a limiting effect.
Example: in sink mode, a source with 100 V is connected and the sine function applied to the current with an amplitude of
80 A and offset 80 A. The function generator would create a sine wave progression of current between 0 A (min) and 160 A
(max), which will result in an input power between 0 W (min) and 16000 W (max). But in case the power would be limited to
12000 W the current would be limited to 120 A and if probed with an oscilloscope it could be viewed being truncated at 120
A and never reach the peak of 160 A.
For an even better understanding how the device works in dynamic operation read following:
•
The device also has an integrated electronic load, here called sink, which is supposed to discharge the
capacities on the DC terminal of the device when running dynamic voltage changes in source mode, i.e
higher voltage to lower voltage. This requires a certain current and thus power setting, which can and
should be adjusted for almost every function described below (values “I (EL)” and “P (EL)”). For safety
reasons, the value “I (EL)” is always set to 0 after selecting a function for configuration, which deactivates
sink mode.
•
The sink current, adjustable as “I (EL)”, when being set to > 0 would load an external source, perhaps also
discharge capacities in this source and thus this current setting has to be chosen carefully, because it
also affects the necessary cross section of cables. Recommendation: set “I (EL)“ to at least I
Peak
of the
resulting curve or higher.
Master-slave systems have further characteristics which have to be considered:
At the end of the configuration, after the function has been loaded and the screen shows the main
view of the function generator, there are adjustable set values, the so-called “U/I/P limits”. These limits
are transferred to all slave units of master-slave systems as set values. It’s recommended to carefully
configure them so the MS system can work as expected and the slaves wouldn’t impact the function
run in a negative way.
