Page 79
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
PSI 9000 2U Series
3.9.2 Series connection
Series connection of two or multiple devices is basically possible. But for reasons of safety and isolation, some
restrictions apply:
•
Both, negative (DC-) and positive (DC+) output poles, are coupled 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 9080-60 2U with PSI 9080-60 2U or PS 9080-60 2U
Series connection in Master-Slave mode is not supported. It means, all units have to controlled separately regarding
set values and DC output status, whether it is manual control or digital remote control. In 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.
The figure below depicts the exemplary series connection of three identical devices with 200 V nominal output
voltage and the maximum potential shift of any DC- output against PE:
