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3.7
Other applications
3.7.1
Parallel operation
Multiple devices of same kind and model can be connected in parallel in order to create a system with higher total
current and hence higher power.
There is no additional support from hardware or software for this kind of operation, regarding voltage regulation
and current balancing. Every unit would have to be adjusted like a standalone device, either manually or remotely.
In this operation mode, some important things have to be noticed and adhered:
• Never connect models with different max. output voltage
• When connecting models with 40 A max. current on the auxiliary output, a max. of 32 A
per unit must not be exceeded
• When connecting multiple units on their auxiliary output, the total current must not be
drawn from any of the main outputs on the front in case it can exceed 32 A
3.7.1.1
Wiring the DC outputs
The DC outputs (main output, aux output or both) of every unit in the parallel operation is simply connected to
the next unit using cables with cross section according to the maximum current and with short as possible length.
3.7.2
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, thus none of the DC minus pole of any unit in the series connection must
have a potential of >200 V against ground (PE)!
• Remote sensing must not be wired to the load, only the sense bridges on the aux output
(rear) are allowed!
• 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 5080-10 A with PS 5080-10 A
Series connection is not supported by the software and hardware of the device. It means, all units have to be
controlled separately regarding set values and DC output status, no matter if manual or remote control.
Due to the max. potential shift of 200 V DC against ground (PE), a max. of two 200 V models or a max. of four 80
V models are allowed in series connection.
3.7.3
Operation as battery charger
A power supply can be used as a battery charger, but with some restrictions, because it misses a battery supervi-
sion and a physical separation from the load in form of a relay or contactor, which is featured with some real battery
chargers as a 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 circuit, i.e. base load, for faster discharge of voltage when switching the
DC output off or ramping voltage down. This base load would, more or less slowly, discharge the battery while
the DC output is switched off, means while it is not charging. This would, however, not occur when the power
supply is not powered at all. It is thus recommended to leave the DC output switched on as long as the battery
is connected (equals to trickle charge) and only switch if off for connecting/disconnecting a battery.
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
PS 5000 A Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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