Page 20
EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
ELR 9000 Series
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
1.9
Construction and function
1.9.1 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 flash 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 Profibus, ProfiNet, 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 configuration, 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 10 units to be combined to a single system with a total power of up to 105 kW.
The generated DC energy is converted through a high efficiency internal inverter and fed back as AC energy into
the 230 V mains.
All models are contolled by microprocessors. These enable an exact and fast measurement and display of actual
values.
1.9.2 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 firmware updates.
Power block
1...3
Controller
(DR)
Commu-
nication
(KE)
HMI (BE)
AC
DC
MS
Anybus or
(opt.) GPIB
USB
USB
Ana
log
Share &
Sense
ELR 9000
Block diagram
