User manual

36
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
© 2008, Elektro-Automatik GmbH & Co. KG
In Level A mode, the load can be switched to remote con-
trol from a PC and via the interface, in order to control and
monitor it like during manual operation.
New since rmware 3.01: when changing to remote control
the currently selected Level Control setting is taken over
and can then be changed by a command.
6.7.2 Level B
When selecting Level B with the selector Level Control(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 con-
trol from a PC and via the interface, in order to control and
monitor it like during manual operation.
New since rmware 3.01: 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 se-
perately 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 adju-
stable. 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gures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 repre-
sents a certain frequency f=1/t. The pulse times are adjustab-
le 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
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conguration“.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 pulse
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. Analogue interface“.
New since rmware 3.01: 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 encoder Selection(5) is used to select the set va-
lues 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gure10with
100A/20ms.
The Level A/B operation is started as soon as the load input
is set to on.
Figure 10. Level A/B operation with pulse width adjustment
Figure 9. Normal load operation in CP regulation mode
Figure 11