36
EN
Instruction Manual
EL 9000 HP Series
Date: 05-31-2011
The manual changeover to regulation mode
CR
can reset
the set values of resistance, current and power to their
nominal values, if the parameter
Keep set values
has
been set to
no
in the setup. If set to
yes
, the least adju-
sted set values are kept. Also see „7.1 The setup menu“.
6.7 Usage of Level A and Level B
Introduction
The names Level A and Level B stand for two different
sets of set values which can be switched over. This is
either done manually with the selector
Level Control
(3)
resp. externally via the analogue interface with the
trigger input (only in
A/B
mode). Or automatically (
A/B
mode), in order to generate a voltage leap.
Each of them,
A
and
B
, has five set values dedicated to
the four regulation modes. That means, that the set value
of current is dedicated to constant current mode etc. and
is represented by the values of A or B. In CP mode you
can, for example, adjust two set values for power, switch
between them and generate power leaps. When using the
A/B mode (see 6.7.3), this switchover happens automati-
cally, in combination with the adjustable pulse widths (i.e.
pulse times) of A and B. This generates a square wave
shaped set value, whose high level is represented by the
A value and whose low level by the B value and whose
period time (and thus frequency) by the sum of the va-
riable pulse widths of A and B. These also determine the
so-called duty cycle. An example: A = 10ms, B = 90ms,
this results in a period time of 100ms (= 10Hz) with 10%
duty cycle. See also figure 10.
6.7.1 Level A
When selecting
Level A
with the selector
Level Con-
trol(3)
the load is switched to manual operation, but
this is only possible, if the status in the display does not
show
Remote mode
or
External mode
.After switching
to
Level A
mode the display shows
Level A.
An arrow
(->) is placed next to the set value which is dedicated
to the currently chosen regulation mode, in order to be
instantly adjustable. The set value(s) can be selected with
Selection(5)
and changed with
Setting(6)
. Which set
values are selectable depends on the regulation mode. In
constant current mode these are, for example, the current
and the power, because the set value for resistance is
only available in resistance mode and the voltage value
must be set to zero in constant current mode. See figure
9 on the next page.
The set value of this mode is kept unchanged until it is
adjusted again, even if the load is switched to
Level B
,
A/B
or
Battery test
. This does not apply if the parameter
Keep set values
has been set to
no
menu“). Then the set value is reset to certain default va-
lue, depending on the currently active regulation mode
(also see „6.6 Preselecting the regulation mode“).
In
Level A
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.
Handling the device
The manual changeover to regulation mode
CV
can reset
the set values of voltage, power and current to their no-
minal values, if the parameter
Keep set values
has been
set to
no
in the setup. If set to
yes
, the least adjusted set
values are kept. Also see „7.1 The setup menu“.
Note:
the CV regulation can not be used in combination
with the battery test mode. Selecting it for battery test will
indicate an error message on the display.
Note:
the voltage set value, which is assigned to the
regulation mode CV, must be set to 0 in any other regu-
lation mode than CV. That‘s why it is not accessible in the
manual operation in the CC, CP or CR modes.
During
remote
control the voltage set value can be sent
to the device, but will be ignored and an access error will
be reported by the communication.
During
external
control (analogue interface) there is an
exception: the voltage set value must be given and can
be used as desired, but should be set to 0V if normal CC,
CP or CR operation is required.
CP
means constant power. Here are the set values of
power and current adjustable. In this mode the device
withdraws as much current as neccessary from the
feeding source in order to consume the adjusted power,
dependent on the input voltage (P = U * I). In case the
input voltage is so low that the withdrawn current exceeds
the nominal current of the device, the adjusted power can
not be achieved. Simultaneously, the current limitation
becomes active.
The manual changeover to regulation mode
CP
can reset
the set value of current to its nominal value and the set
value of power to 0, if the parameter
Keep set values
has
been set to
no
in the setup. If set to
yes
, the least adju-
sted set values are kept. Also see „7.1 The setup menu“.
CR
means constant resistance. The device features
two resistance ranges. For values refer to the technical
specifications section.
The CR regulation mode is only active as long the switch
Mode(2)
is set to one of the two resistance ranges. Both
ranges act the same way, they only differ in the higher
resolution and accuracy of the lower resistance range.
In this mode, the set values of resistance, current and
power are adjustable.
This regulation mode loads the feeding voltage or current
source so much that the adjusted resistance results from
the relation of input voltage to input current (R= U / I). In
case the input voltage is so high that the input current
exceeds the nominal current value, the adjusted resi-
stance can not be achieved. Simultaneously, the current
limitation becomes active. If the product of input voltage
and input current, the power, exceeds the nominal power
of the device, the power limitation becomes active. Then
the adjusted resistance can also not be achieved.
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