37
EN
Instruction Manual
EL 9000 HP Series
Date: 05-31-2011
External trigger
The external switchover between A and B, realised with
the trigger input (analogue interface), is only available
in Level A/B mode. The trigger input has to be activated
in the setup menu with the option
Trigger mode
(see
„7. Device configuration“. The default setting is
internal
.
By setting it to
external
the switchover between A and B
can only be done via the trigger input.
The adjusted rise/fall time is still effective here, but the pul-
se widths are now determined by the trigger signal, which
is fed into the trigger input. The trigger signal must be
square wave, for levels see „8. The analogue interface“.
As long as external trigger is active the pulse times of A
and B are not indicated in the display and are also not
adjustable anymore. The display also indicates the status
with „
Ext. trigger active
“.
The rotary knob
Selection(5)
is used to select the set
values for A and B, as well as both pulse times, and
Setting(6)
is used to change them. The display shows
the letters
A
and
B
to indicate the assignment. When
navigating between the set values, an arrow (->) is placed
in front of the currently selected one. A rise/fall time for
the pulsed operation is also adjustable. Both, rise and fall
time, are identical and can‘t be set seperately for A and
B. It is displayed as slew rate in the format ∆value/∆time,
like for example in figure 10 with 100A/20ms.
The
Level A/B
operation is started as soon as the load
input is set to on.
6.7.2 Level B
When selecting
Level B
with the selector
Level Con-
trol(3)
the load is switched to manual operation. This
mode works the same way as
Level A
, with the difference
that the set values of
Level B
are used now and instantly
set after switching.
In
Level B
mode, the load can be switched to remote
control from a PC and via the interface, in order to control
and monitor it like during manual operation.
When changing to remote control the currently selected
Level Control
setting is taken over and can then be
changed by a command.
6.7.3 Level A/B (pulsed operation)
This mode combines two set values A and B with two
seperately adjustable pulse widths (=times) for A and
B. This results in a period time and the generated signal
produces automatic set value leaps between the two set
values of A and B. The rise/fall time of the set value leap
also is adjustable. This pulsed operation is only applied
to the set value which belongs to the chosen regulation
mode, the other set values remain constant. See also
figures 11 and 12.
The pulse time of A is dedicated to the set value of A
etc. The sum of the pulse times results in a period time
t
, which represents a certain frequency
f=1/t
. The pulse
times are adjustable from 50µs...100s which results in a
time of 100µs...200s, which corresponds to a frequency
of 10kHz...0.005Hz.
Note:
Alarms like OVP or PF (power fail) (see „6.9 Alarm
management“) which switch off the input also stop the
pulsed operation. It can be resumed as soon as all alarms
are gone and have been acknowledged.
Handling the device
Figure 10. Level A/B operation with pulse width adjustment
Figure 9. Normal load operation in CP regulation mode
Figure 11
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