Other Applications; Parallel Operation In Share Bus Mode - Elektro-Automatik PS 9000 1U Betriebsanleitung

PS 9000 1U Series
3.9

Other applications

3.9.1

Parallel operation in Share Bus mode

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. To achieve that, the units have to be connected with their DC outputs and their
Share Bus. The Share Bus will balance the units in their internal voltage regulation and thus current regulation,
which will result in a balanced load distribution.
In the parallel operation, a specific unit, a "Share Bus master", has to be picked as leading unit which drives the
"Share Bus slaves". The master unit will remain fully controllable, also via analog or digital interface. The slaves,
however, are restricted regarding set value adjustment. Their set values are just limits for the units while it is con-
trolled via the Share Bus. A slave unit still can be controlled remotely, but not like a master unit. All slaves can be
monitored (actual values,status), no matter via analog or digital interface.
The Share Bus only control the process variable U (voltage). It means, the DC outputs of slave
units have to be switched on or off either manually or remotely, which is very easy in analog
remote control, because the related pins REM-SB could simply be connected in parallel, too.
In digital remote control and when using the Ethernet port, all DC outputs could be switched at
the same time by sending broadcast messages.
3.9.1.1 Wiring the DC outputs
The DC output 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.
3.9.1.2 Wiring the Share bus
The Share bus is wired from unit to unit with an ideally twisted pair of cables with non-critical cross section. We
recommend to use 0.5 mm² to 1.0 mm².
The Share bus is poled. Take care for correct polarity of the wiring!
A max. of 10 units can be connected via Share bus.
3.9.1.3 Configuring units for Share Bus operation
For correct Share Bus operation in parallel connection, the formerly picked master unit has to be configured as
"Share Bus master". By default, these power supplies are set as "Share Bus slaves", so that this configuration step
is not necessary for all slave units.
Only one unit in the Share Bus connection must be configured as Share Bus master, else the
Share Bus won't work.
► How to configure a device as Share Bus master
1.
Switch off the DC output and push button
menu "Settings".
2.
In the submenu navigate to "General" and push
3.
Use arrow button
ter" by using the right-hand rotary knob.
4.
Accept the settings with
3.9.1.4 Operating the Share Bus system
After successful configuration and initialisation of the master and slave units, it is recommended to check all set
values and protection settings of all slaves and possibly adjust to identical values.
The slaves can be controlled manually as usual or remotely via the analog or via digital interfaces, but they don't
react to set values changes the same way as the master. They can, if needed, be monitored by reading actual
values and status.
The master unit is not restricted and can be used like a stand-alone unit.
EA Elektro-Automatik GmbH
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Helmholtzstr. 31-33 • 41747 Viersen
Germany
to navigate to item "Share Bus mode" on the 2nd page and switch to setting "Mas-
or discard them with
to call the setup menu. Push
once again.
.
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
again to enter sub-
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