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EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
ELR 9000 Series
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
3.10.2.4 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:
•
Type of connection: RS485 with 115200Bd
•
A maximum 10 units can be connected via the bus: 1 master and up to 9 slaves.
•
Only devices of same kind, i.e. electronic load to electronic load, and of the same model, such as ELR 9080-170
to ELR 9080-170.
•
Units at the end of the bus must be terminated (see below)
The master-slave bus (RS485) must not be wired using crossover cables!
Later operation of the MS system implies:
•
the master unit displays, or makes available to be read by the remote controller, the sum of the actual values
of all the units
•
the range for setting the values of the master is adapted to the total number of units, thus, if e.g. 5 units each with
a power of 7 kW are connected together to a 35 kW system, then the master can be set in the range 0...35 kW.
►
How to connect the master-slave bus
1.
Switch off all units that are to be connected and connect them together with a network cable (CAT3 or bet-
ter, not included). It doesn’t matter which of the two master-slave connection sockets (RJ45, backside) is
connected to the next unit.
2.
Also connect all units at the DC side.
3.
The two units at the beginning and end of the chain should be terminated, if long connection cables are
used. This is achieved using a 3-pole DIP switch which is positioned on the back side of the unit next to the
MS connectors.
►
Position: not terminated
(default)
Position: terminated
Now the master-slave system must be configured on each unit. It is recommended to configure first all the slave
units and then the master unit.
►
Step 1: Configuring all slave units
1.
Enter
then GENERAL SETTINGS and press
until reaching PAGE 8.
2.
Activate the MS mode with touch area
. A warning requester will appear which has to be ac-
knowledged with OK, otherwise the change will be reverted.
3.
Set the address of the slave between 1 and 15 with the left-hand rotary knob. Ensure that no address is
allocated twice.
4.
Accept the settings with the touch area
and return to the main page.
The slave is then configured for master-slave. Repeat the procedure for all other slave units.
►
Step 2: Configuring the master unit
1.
Enter
then GENERAL SETTINGS and press
until reaching PAGE 8.
2.
Specify the unit as master with tough area
. A warning requester will appear which has to be
acknowledged with OK, otherwise the change will be reverted.
3.
Accept the settings with the touch area
and return to the main page.
