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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSI 9000 15U/24U Series
3.11
Other applications
3.11.1
Parallel operation in master-slave (MS)
Parallel operation of multiple cabinets is
not
intended. In case the total power of one cabinet is insufficient for
the planned application, certain models can be extended by 15 kW or 30 kW of power. See
For other solutions, please contact our support. See
.
3.11.2
Series connection
Series connection of two or multiple cabinets is
not
intended.
3.11.3
Operation as battery charger
A power supply can be used as a battery charger, but with some restrictions, because it misses a battery super
-
vision and a physical separation from the load in form of a relay or contactor, which is featured with real battery
chargers as a form of protection.
Following has to be considered:
•
No false polarity protection inside! Connecting a battery with false polarity will damage the power supply severely,
even if it is not powered.
•
All models of this series have an internal discharge circuit and a base load, which both ensure faster discharge
of voltage when switching the DC output off or ramping voltage down. While the discharge circuit only works
while the DC output is off, the base load would, though very slowly, discharge the battery even while the power
supply is not powered at all. It is thus recommended to only leave battery is connected until it’s fully charged.
3.11.4
Two quadrants operation (2QO)
3.11.4.1
Introduction
This way of operation refers to the use of a source, in this case a power supply
of series PSI 9000 15U/24U, and a sink, in this case one or several electronic
loads of series ELR 9000 or EL 9000 B. The source and the sink function al
-
ternatingly 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+
U-
I+
I-
I
II
III
IV
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..
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
load will then, using the Share Bus, control the output voltage
of the power supply.
Typical applications:
•
Fuel cells
•
Capacitor tests
•
Motor driven applications
•
Electronic tests where a high dynamic discharge is required.
