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Intepro Systems
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PS 9000 3U Series
3.9.1.5
Alarms and other problem situations
Parallel operation, due to the connection of multiple units and their interaction, can cause additional problem sit
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uations which do not occur when operating individual units. For such occurrences the following regulations have
been defined:
•
If one or more slave units are switched off on the AC side (power switch, supply undervoltage) and come back
later, they’re automatically included again in the system. The remaining units will continue to work without inter
-
ruption, but the entire system will provide less power
•
If the DC output of the master unit is switched off due to a defect or overheating, then the total parallel system
can provide no output power
•
If accidentally multiple or no units are defined as master the Share Bus parallel system can’t be initialised
In situations where one or multiple units generate a device alarm like OV, PF or OT following applies:
•
Any alarm of a slave is indicated on the slave’s display only
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 connected to PE via type X capacitors
•
None DC minus pole of any unit in the series connection must have a potential against ground
(PE) higher than specified in the technical data! The maximum allowed potential shift varies
from model to model and is different for DC plus and DC minus
•
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 isn’t supported. It means, all units have to controlled separately regarding
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.
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.
3.9.3 Operation as battery charger
A power supply can be used as a battery charger, but with some restrictions, because it misses a battery super
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vision 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 isn’t powered.
•
Models from 200 V rating feature an internal discharge circuit for faster down-ramping of the output voltage
after switching the output off. This small load can discharge the battery more or less slowly while the DC output
is switched on and the power supply’s output voltage is set to be lower than the battery voltage. This would,
however, not occur when the power supply isn’t powered at all. It is thus recommended to leave the DC output
switched off as long as the battery isn’t supposed to be charged.
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