User Manual

Page 20
ELR 9000 Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
1.10 Construction and function
1.10.1 General description
The electronic high performance loads of the ELR 9000 series are especially suitable for test systems and industrial
controls due to their compact construction of a 19” enclosure with 3 height units (3U). Apart from basic functions of
electronic loads, set point curves can be produced in the integrated function generator (sine, rectangular, triangular
and other curve types). Arbitrary curves can be stored on and uploaded from a USB ash drive.
For remote control using a PC or PLC the devices are provided as standard with a USB-B slot on the back side
as well as a galvanically isolated analog interface.
Via optional plug-in interface modules other digital interfaces such as Probus, ProNet, ModBus, CANopen and
more can be added. These enable the devices to be connected to standard industrial buses simply by changing or
adding a small module. The conguration, if at all necessary,.is simple. Thus the loads may, for example, be oper-
ated with other loads or even other types of equipment or controlled by a PC or PLC, all using the digital interfaces.
In addition the devices offer the possibility to connect to compatible power supplies via a Shared Bus, in order to
create a so-called two-quadrants system. This operation mode uses the source-sink principle for testing devices,
components and other parts in many industrial areas.
A genuine master-slave connection with totalling of the slave units is also provided as standard. Operating in this
way allows up to 17 units to be combined to a single system with a total power of up to 255kW.
The generated DC energy is converted through a high efciency internal inverter and fed back as AC energy into
the 230V mains.
All models are contolled by microprocessors. These enable an exact and fast measurement and display of actual
values.
1.10.2 Block diagram
The block diagram illustrates the main components inside the device and their relationships.
There are digital, microprocessor controlled components (KE, DR, BE), which can be target of rmware updates.
Power block
1...3
Controller
(DR)
Commu-
nication
(KE)
HMI (BE)
AC
DC
MS
Any
Bus
USBUSB
Ana
log
Share &
Sense
ELR 9000
Block diagram