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EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
PSI 9000 3U Series
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
3.10.2 Series connection
Series connection of two or multiple devices is basically possible. But for reasons of safety and isolation, following
restrictions apply:
•
Both, negative (DC-) and positive (DC+) output poles, are connected to PE via type X capacitors
•
None DC minus pole of any in the series connection must have a potential of >400 V against
ground (PE)!
•
The Share Bus must not be wired and used!
•
Remote sensing must not be used!
•
Series connection is only allowed with devices of the same kind and model, i.e. power supply with
power supply, like for example PS/PSI 9080-170 3U with PSI 9080-170 3U or PS 9080-170 3U
Series connection in Master-Slave mode is not supported. It means, all units have to controlled separately regard
-
ing set values and DC output status, whether it is manual control or remote control (digital or analog).
Due to the max. allowed potential shift on the DC output certain models are not allowed for series connection at
all, like the 1000 V model, because the DC plus there is only isolated up to 1000 V. On the contary, two 500 V
models are eligible for series connection.
Analog interfaces on the units in serial connection can be connected in parallel, because they are galvanically iso
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lated. It is also allowed to ground the GND pins of the analog interfaces connected in parallel, which may happen
automatically, when connecting them to a controlling device such as a PC, where grounds are directly tied to PE.
In digital remote control, an almost synchronous control can be achieved by using any available Ethernet interface
module and sending message as broadcast, so they address multiple units at once.
