Control Locations And Priorities; Series And Parallel Connection; Functions Of The Connector „System Bus; Two-Quadrants Operation - Elektro-Automatik EL 9000 A Bedienungsanleitung

Handling the device
Figure 13. Battery test operation in current control (CC) mode
6.9 Control locations and priorities
Control locations are the locations from where the device
is controlled. This can be at the device (manual control),
via the analogue interface (external control) or via a di-
gital interface card (remote control). In order to prevent
the user from accessing the device from two locations at
once there are priorities. Following applies:
The analogue interface has the highest priority, the digital
interface the second highest one and the manual control
the lowest one. It means, that if the device was set to re-
mote control, modes and set values can't be set with the
switches and rotary knobs anymore. If the device would
be switched to external control while remote control is
active, the remote control status would be reset and the
device would only be controllable via the analogue inputs.
In order to report this to a software running on a PC, still
trying to access and control the device, the control loca-
tion is internally set to „local". In „local" status the device
can only be read (i.e. monitored) by the PC.
6.10 Series and parallel connection
Parallel connection of multiple loads is possible, but it is
not explicitely supported. That means, there is no auto-
matic distribution of the current at parallel connection. The
user has to take care of the correct control of the devices.
When using parallel connection, the symmectric distri-
bution is achieved by adjusting the same set values for
U,I,P and R at any device via the control panel or the
interfaces (digital or analogue).
Attention! Series connection is not allowed! The
devices could be damaged.
Instruction Manual
EL 9000 A Series
6.11 Functions of the connector „System Bus"
6.11.1 Two-quadrants operation
The Share Bus of the electronic load is compatible for
so-called two quadrants operation with certain power
supply series:
• Serie PS 9000
• Serie PSI 9000
• PSI 8000 DT/2U
• PS 8000 DT/2U
Other series or subseries, even if they do feature a Share
bus, are not compatible or only by extra measures.
The connection for two quadrants operation is as follows:
PS 9000 / PSI 9000:
Connect pin 5 (Share Bus) of the EL9000 to pin 5 (Share
Bus) of the power supply and pin 6 (AGND) of the EL9000
with pin 6 (AGND) of the power supply.
PS 8000 / PSI 8000:
Connect pin 5 (Share Bus) of the EL9000 to pin 7 (Share
Bus +) of the power supply and pin 6 (AGND) of the
EL9000 with pin 6 (AGND or Share Bus -) of the power
supply.
In Share Bus operation, the electronic load operates
as the leading component and the power supply as the
depending one.
Typical applications for the two-quadrants operation are:
• Battery tests with semi-automatic charge and discharge
cycles
• Automotive electronic tests with simulation of transients
like for example voltage break-ins during engine starts
• Cyclic charging and discharging of capacitors
Note: two-quadrants operation is only suitable for CV
mode (constant voltage).
Date: 11-16-2011
EN
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