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Handling the device
CV
means constant voltage. Here are the set values of
voltage, current and power adjustable. In this mode the input
voltage is limitted to the adjusted set value by loading the
feeding source so much that its output voltage collapses. If
the feeding source is able to deliver more current than the
device is able to withdraw, then the voltage limit can not be
achieved.
The manual changeover to regulation mode CV can reset
the set values of voltage, power and current to their nominal
values, if the parameter
Keep set values
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 re-
gulation mode CV, must be set to 0 in any other regulation
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withdrawn current exceeds the nominal current of the device,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
to
no
in the setup. If set to yes, the least adjusted 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 speci-
fications 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 re-
solution and accuracy of the lower resistance rang e. 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 resistance can not
be achieved. Simultaneously, the current limitation becomes
© 2008, Elektro-Automatik GmbH & Co. KG
has been set to
Keep set values
has been set
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.
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
no
in the setup. If set to yes, the least adjusted 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.), this switchover happens automatically, in com-
bination 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 variable 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 Control(3)
the load is switched to manual operation, but this is only
possible, if the status in the display does not show
mode
or
External
mode.After switching to Level A mode
the display shows
Level A.
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 ad-
justed again, even if the load is switched to Level B, A/B or
Battery test. This does not apply if the parameter
values
has been set to
no
the set value is reset to certain default value, depending on
the currently active regulation mode (also see „6.6 Selecting
the regulation mode").
...continued on next page.
has been set to
Remote
An arrow (->) is placed next to
Keep set
(see „7.1 The setup menu"). Then
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