User manual

37
Instruction Manual
EL 9000 HP Series
EN
Date: 10-31-2011
Figure 12
Figure 12 shows a possible progression of a set value
(U, I, P or R) with adjustable pulse widths and variable
amplitude. The rise/fall time is also adjustable, but is
equal for A and B.
If the rise/fall time is set to minimum, the signal of the
pulsed operation is a nearly ideal square wave. Figure
12 is only a clarifying view. The real progression of,
for example, an input current which is pulsed with a
frequency of 1kHz, will differ more or less. It depends
on many circumstances, like the regulation time of the
feeding power supply, the regulation time of the load, line
impedances etc.
In „pulsed“ operation the actual values are also pulsing
and the values constantly change in the display, so they
are not clearly readable.Thus the actual values are now
only indicated at pulse times >=1s (A and B each) and
can be read quite clearly by looking at them. Internally the
actual values are measured much more often (every few
milliseconds). They can always be read via an interface
card, but they are still constantly changing and are not
strictly assigned to level A or B and could thus also be
measured during rise or fall.
6.7.4 Rise/falltime
The rise and fall times are equal and are thus conside-
red as one value. Also see gure 10. It is continuously
adjustable in a range of 30µs...200ms. The step width is
changing from µs to ms over the whole range. The error
lies at max. +10%.
The time is displayed as slew rate in the format ∆value/
time. Example: the set value of A has been set to 40A
and the one of B to 20A, then a current leap of 20A is
generated in a time x, for instance 100ms. The display
then shows 20A/100ms. The ∆value is not adjustable at
this point.
Note: the pulse widths of A and B should always be
greater than the rise/fall time, else the pulsed signal
would result in triangle-shaped wave form or something
else. For example, a pulse width of 100ms for A and B
and a rise/fall time of 100ms creates a triangle-shaped
signal with a period time of 200ms.This might be wanted
in certain applications and is thus not limited or inuenced
by the device.
Handling the device
6.8 Thebatterytestmode
Introduction
Mode „Battery“ is intended for battery tests, by connecting
a battery to the load and discharge it denedly. The ave-
rage current is measured and the elapsed time is counted
and then displayed as the consumed battery capacity in
Ah. The voltage supervision, together with the adjustable
undervoltage shutdown threshold Ulow, prevents the
battery from being deeply discharged. This threshold
needs to be adjusted at least once. If it is exceeded du-
ring the test, the load input is automatically switched off
and the time counter is halted. No more current is drawn
from the battery. If the threshold is set to greater than the
battery voltage, the test can‘t be started.
Selectingtheregulationmode
The preselected regulation mode determines the set
values that can be adjusted for the test. The mode can
be changed at any time,even while the test is running.
Doing so will reset the whole test, along with time counter
and Ah value.
Usage
Before and during the test you can adjust the set value of
the (pre)selected regulation mode (CC, CR or CP) and the
undervoltage shutdown threshold Ulow. The value to set
is selected with Selection(5) and adjusted with Setting(6).
The displays shows the elapsed test time in the format
Hours:Minutes:Seconds (HH:MM:SS), as well as the
consumed capacity in Ah.
CalculationoftheAhvalue
The ampere hours value (withdrawn electric charge) is
calculated from the average of the last two measurings
of the input current and the elapsed time.
Start/pause/stopthetest
The test ist started by pressing the pushbutton Inputon/
off(4) and either stops after 100 hours are counted or
the battery voltage exceeds the undervoltage threshold.
Another press of the button Inputon/off(4) during the test
halts it, another press will continue the test. A reset of the
time counter is done by leaving the battery test mode by
switching the selector LevelControl(3)to position Level
A/B or Setupor by switching to a different regulation
mode with Mode(2).
Note: if external control by analogue interface is activated
(pin REMOTE = low) while the battery test is running, the
test is aborted. After external control has left again and if
the switch „Level Control“ is still in position „Battery“, the
test can be started again. Time and Ah value are reset.
Note: if the regulation mode is changed by Mode(2), all
other set values that are not adjustable for the selected
regulation mode are set to default values in order to let
the test mode work correctly. Hence the setting Keep set
values is ineffective here.
The example in gure 13 shows that the current of 100A
can not be reached because the power limitation has
become active (example of a 2400W model).
Note: The time display is not 100% exact. The deviation
of the displayed time to the actually elapsed time can be
1-2 seconds per hour.