© EA Elektro-Automatik in 2022, this information is subject to change without notice
88
06230820_manual_psi_10000_3u_15kw_en_01
3.11
Other applications
3.11.1
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 outputs, 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 output, 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
3.11.1.1
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 not supported, but limited to series PS 10000 models which can serve as
cheaper slave units
3.11.1.2 Wiring the DC outputs
The DC output 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. The same applies when building several blocks of devices, i. e. a block of power supplies and a block of elec-
tronic load, to later connect then in two-quadrant operation. The blocks should be placed as close as possible to each other.
3.11.1.3 Wiring the Share bus
The Share bus is wired from unit to unit with standard BNC cables (coaxial, 50 Ω type) with a length of 0.5 m (1.64 ft) or similar.
Both sockets are internally connected and are not specifically input or output. The labeling is only for orientation.
A max. of 64 units can be connected via Share bus.
