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3.7
Other applications
3.7.1
Series connection
Series connection is not a permissible operating method for electronic loads and must not be
installed or operated under any circumstances!
3.7.2
Parallel operation in master-slave (MS)
Running the Slave models of series EL 9000 B Slave in master-slave operation is the primary function. The devices
usually work as slave units which are enumerated and controlled by a master device. Instructions for configuration
and use of a master device where, which normally is a standard model with display from series EL 9000 B, can
be found in the user manual of EL 9000 B series.
This section is about a different situation where a Slave model is supposed to be the master unit as substitute
of a missing or not matching master model. Running the Slave as master is basically possible, though all setup
and control is only done via the USB ports and by software. Since the front USB port is restricted in its functions
and does not support master-slave configuration, we recommend to use the rear USB port for all communication.
3.7.2.1
Introduction
Multiple devices with identical ratings can be connected in parallel in order to create a system with higher total cur-
rent and hence higher power. This can be done using the standard models with display or the new slave models
(EL 9000 B Slave, available since August 2017). Disadvantage: there are only five slave models available, so they
only match the corresponding standard models.
For parallel operation in master-slave mode the units are usually connected with their DC inputs, their Share bus
and their master-slave bus. The master-slave bus is a digital bus which 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 power, especially if the master unit runs a func-
tion. 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.
3.7.2.2
Restrictions
Compared to normal operation of a single device, master-slave operation has some limitations:
• The MS system reacts differently to alarm situations (see below in 3.7.2.7)
• Using the Share bus makes the system reacts as dynamically as possible, but it is still not as dynamic as single
unit operation
3.7.2.3
Wiring the DC inputs
The DC input 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.
3.7.2.4
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 mm².
•
The Share bus is poled. Take care for correct polarity of the wiring!
•
In order for the Share bus to work correctly it requires at least to connect all DC minus
inputs of the devices
A max. of 16 units can be connected via Share bus.
3.7.2.5
Wiring and set-up of the master-slave bus
The master-slave connectors are built-in and must first be connected via network cables (≥CAT3, patch cable) and
then MS can be configured manually (recommended) or by remote control. The following applies:
• A maximum 16 units can be connected via the bus: 1 master and up to 15 slaves.
• Only devices of same kind, i.e. electronic load to electronic load, and of the same model, such as EL 9080-170
B to EL 9080-170 B or EL 9080-170 B Slave.
• Units at the end of the bus must be terminated (see below)
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B Slave Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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