© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
3.11.8
Trapezoidal function
Restrictions which apply particularly to this function:
•
There is no preselection to which of both, source mode and sink mode, the function is applied; the settings decide whether
it’s “source mode only”, “sink mode only” or a mixture of both
•
When applying the function to the voltage, the device can only switch to and work in sink mode if the external voltage on the
DC terminal is higher than the highest point ( amplitude) of the wave and the current setting “I (EL)” is not 0
The following parameters can be configured for a trapezoidal function:
Parameter
Range
Description
Amplitude (A)
0...(rated value - |Offs|) of U or I Amplitude of the signal to be generated
Offset (O)
0... (U
Nom
- A)
Offset, based on the foot of the trapezium
- (I
Nom
- A)...+(I
Nom
- A)
Time t1
0.1 ms...36,000,000 ms
Time for the positive slope of the trapezoidal wave signal.
Time t2
0.1 ms...36,000,000 ms
Time for the top value of the trapezoidal wave signal.
Time t3
0.1 ms...36,000,000 ms
Time for the negative slope of the trapezoidal wave signal.
Time t4
0.1 ms...36,000,000 ms
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
Same as with other functions the generated signal can be applied to
the set value of voltage (U mode) or to the current (I mode). The slopes
of the trapezium can be varied by adjusting the times for rise and fall
separately.
The periodic duration and repetition frequency are the result of the four
adjustable time values. With suitable settings the trapezium can be de-
formed to two triangular or two rectangular pulses. It has, therefore,
universal use.
3.11.9
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 automobile battery voltage during engine starting. The curve is divided into 5 parts (see
diagram below) which each have the same parameters. The standard values from the DIN are set already as default values
for the five sequences.
Typically, this function is used in source mode, but can also be run in sink mode if the external voltage on the DC terminal is
higher than the highest point ( amplitude) of the wave and the external source can’t deliver more current than adjust-
ed for sink mode (I sink). Else the device could regulate the voltage values resulting from the curve. The global current set
values are used to explicitly define in what operation mode the function shall run. The following parameters can be config
-
ured for the single sequence points or the entire function:
Parameter
Range
Seq Description
Start
0...U
Nom
1-5
Start voltage of the ramp in part 1-5 (sequence point)
Uend
0...U
Nom
1-5
End voltage of the ramp in part 1-5 (sequence point)
Time
0.1 ms...36,000,000 ms
1-5
Time of the ramp
Cycles
0 / 1...999
-
Number of times to run the entire curve (0 = infinite)
Time t1
0.1 ms...36,000,000 ms
-
Time after cycle before repetition (cycle <> 1)
U(Start/End)
0...U
Nom
-
Voltage setting before and after the function run
I/P (PS)
0...I
Nom
/P
Nom
-
Set values of current and power for source mode. If either I=0 or P=0, the
device would only work in sink mode
I/P (EL)
0...I
Nom
/P
Nom
-
Set values of current and power for sink mode. If either I=0 or P=0, the
device would only work in source mode