Two Quadrants Operation (2Qo) - Elektro-Automatik PS 9000 1U Betriebsanleitung

PS 9000 1U Series
3.9.4

Two quadrants operation (2QO)

3.9.4.1 Introduction
This way of operating refers to the use of a source, in this case a power supply
of series PS 9000 1U, and a sink, in this case an electronic load of a compatible
series (see „1.9.5. Share Bus-Connection"). The source and the sink function
alternatingly in order to test a device, such as a battery, by deliberately charging
and discharging it as part of a functional or final test.
The user can decide whether the system is operated manually or the power
supply only as the dominant unit or both devices should be controlled by PC.
We recommend to focus on the power supply, which is intended to control the
load via the Share Bus connection. The two quadrants operation is only suitable
for constant voltage operation (CV).
Clarification:
U+
II
I-
III
U-
3.9.4.2 Connecting devices to a 2QO
There are a number of possibilities to connect source(s) and sink(s) to make a 2QO:
E-LOAD
Share-Bus
E.U.T
E-LOAD
Share-Bus
E.U.T
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A combination of source and sink can only map the quadrants
I + II. This means that only positive voltages are possible. The
positive current is generated by the source or application and
the negative current flows into the load..
I
The maximum approved limits for the application should be set
in the power supply. This can be done via the interface. The
electronic load should preferably be in operating mode CV. The
I+
load will then, using the Share Bus, control the output voltage
of the power supply.
IV
Typical applications:
• Fuel cells
• Capacitor tests
• Motor driven applications
• Electronic tests where a high dynamic discharge is required.
Configuration A:
PSU
1 e-load and 1 power supply, plus 1 test object (E.U.T).
This is he most common configuration for 2QO. The nominal
values for U,I and P of the two devices should match as close
as possible, for instance EL 9080-170 B and PS 9080-100
1U. The system is controlled by the power supply, which has
to be set to "Master" for parameter "Share bus mode" in the
setup menu.
Configuration B:
PSU n
1 e-load and multiple power supplies, plus 1 test object
(E.U.T).
SB
For adapting the total power of the power supply device to
the possibly higher input power of the load, the power sup-
PSU 1
plies are connected via Master-Slave and the load's current
is shared across the power supplies when wiring the Share
bus to gain a balanced load distribution.
One PSU, preferably PSU 1, has to be set to Master for the
Share bus connection.
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