© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
3.12
Other applications
3.12.1
Parallel operation in master-slave (MS)
Multiple devices of same kind can be connected in parallel in order to create a system with higher total current and hence
higher power. For parallel operation in master-slave mode the units are usually connected with their DC terminals, their Share
bus and their master-slave bus, which is a digital bus that makes the system work as one big unit regarding adjusted values,
actual values and status.
The Share bus is intended to balance the units dynamically in their voltage on the DC terminal, i.e. in CV mode, especially if
the master unit runs a dynamic function. In order for this bus to work correctly, at least the DC minus poles of all units have
to be connected, because DC minus is the reference for the Share bus.
Principle view (without load or source):
Share bus connection
Master-slave bus
3.12.1.1 Restrictions
Compared to normal operation of a single device, master-slave operation has some restrictions:
•
The MS system reacts partly different in alarm situations (see below in
•
Using the Share bus makes the system react as dynamic as possible, but it’s still not as dynamic as single unit operation
•
Connection to identical models from other series is supported, but limited to PSBE 10000 series which can serve as slave units
3.12.1.2 Wiring the DC terminals
The DC terminal of every unit in the parallel operation is connected with correct polarity to the next unit, using cables or
copper bars with a cross section according to the total system current and with short as possible length, so their inductance
is as low as possible.
