6RL SERIES OPERATION MANUAL
SECTION 6: FRONT PANEL OPERATION
Entire Contents Copyright
2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual
Page 103 of 204
6.9.11
Ramp Function
The following parameters can be configured as the basis for a ramp function:
Value
Range
Description
Ustart / Istart
0...Nominal value of U, I
Start value (U,I)
Uend / Iend
0...Nominal value of U, I
End value (U, I)
t1
0.1 ms...36000 s
Time before ramp-up or ramp-down of the signal.
t2
0.1 ms...36000 s
Ramp-up or ramp-down time
Schematic Diagram:
Application and Result:
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. To have a repeating ramp, function
Trapezoid would have to be used instead. (See
section 6.9.8).
Important to consider are the static values of U
and I which define the start levels at the
beginning of the ramp. It is recommended that
these values are set equal to those in A.start,
unless the load at the DC Input should not be
provided with voltage before the start of the
ramp. In that case, the static values should be set to zero.
Note: Ten hours after reaching the ramp end, the function will stop automatically (i.e. I = 0
A, in case the ramp was assigned to the current), unless it is stopped manually
before.
6.9.12
UI and IU Table Functions (XY Table)
The UI and IU functions offer the user the possibility to set a DC Input current dependent on
the DC Input volt- age, or a DC Input voltage dependent on the DC Input current. The
function is table driven with exactly 4096 values, which are distributed over the entire
measured range of actual output voltage or output current values in the range of 0...125%
Unom or Inom. The table can either be uploaded from an USB memory stick through the
front side USB port of the unit or via remote control (ModBus protocol or SCPI). The
functions are:
UI function: U = f(I)
IU function: I = f(U)
In the UI function, the equipment measuring circuit determines the level from 0 to
maximum of the output current. For each of the 4096 possible values for output current, a
voltage value is maintained by the user in the UI table, which can be any value between 0
and nominal value. The values uploaded from an USB stick will always be interpreted as
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