Rise/Fall Time; The Battery Test Mode - Elektro-Automatik EL 9080-600 Bedienungsanleitung

Handling the device
Note: during Level A/B operation following applies: the set
value of A must always be greater than or equal to B. Thus
you can adjust A downwards only to the value of B and B
upwards only to the level of A. If it seems that Level A is not
adjustable somehow this might be caused by Level B being
the same value.
Figure 12 shows a possible progression of a set value (U,
I, P or R) with adjustable pulse widths and variable ampli-
tude. 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.
Changes since firmware 3.01: 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 considered as
one value. Also see figure 10. It is continuously adjustable in
a range of 0µs...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 delta 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 influenced by the device.
8
6.8

The battery test mode

Introduction
The battery test mode enables the user to connect a battery
to the load and discharge it definedly. The average current
is measured and the elapsed time is counted and then
display as the consumed battery capacity in Ah. The volta-
ge 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 during 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.
Chose regulation mode
Up to firmware 2.xx: the regulation mode must be chosen
Figure 12
with selector Mode(2) before switching to battery test mode.
Depending on this you can then either change the current,
power or resistance set value. The battery test is not suited
for constant voltage regulation mode (CV) and the display
will show the text
This merely points the user to chose a different regulation
mode.
New since firmware 3.01: the regulation mode can also be
changed after switching to Battery with the selector switch
Level Control(3) or even during it is running. Doing so will
reset the whole test (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 con-
sumed capacity in Ah.
Calculation of the Ah value
The ampere hours value (withdrawn electric charge) is cal-
culated 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 coun-
ter is done by leaving the battery test mode by switching the
selector Level Control(3) to position Level A/B or Setup
or, since firmware 3.01, 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.
Battery test unsupported in CV
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
© 2008, Elektro-Automatik GmbH & Co. KG
EN
mode.