Elektro-Automatik EL 9000 B Slave serie Betriebsanleitung Seite 77

The master-slave bus 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 7.2 kW are connected together to a 36 kW system, then the master can be set in the range 0...36 kW.
• Slave units with master-slave mode setting "Slave" are not operable as long as being controlled by the master
• Slave units will indicate the alarm "MSP" via LED "Error" on their control panel, as long as they not have been
initialised by the master. The same alarm is signalled after a connection drop to the master unit occurred.
• In case the function generator of the master unit is going to be used, the Share bus must be connected as well
► 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.
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.
The configuration itself can be done with EA Power Control or custom software. The programming guide, as
included in the delivery on USB stick, explains remote configuration for master-slave in custom applications.
3.7.2.6 Operating the master-slave system
After the first initialisation after any reconfiguration of the system the master can be operated and controlled like a
single stand-alone unit. While software EA Power Control automatically detects MS mode and adapts the rated
values to what the MS system represents, this has to be considered in custom applications. The master will offer
a set of system ratings, readable with extra registers resp. SCPI commands. These ratings could change every
time the system is initialised for master-slave, depending on the number of slaves.
The following applies:
• The master can be treated as a standalone unit
• The master shares the set values across the slaves and controls them
• The master is remotely controllable via the analog or digital interfaces
• All settings for the set values U,I and P (monitoring, settings limits etc.) will be adapted to the new total values
• All initialised slaves will reset any limits (U
(UCD, OVD etc.) to default values, so these don't interfere the control by the master. As soon as these values
are modified on the master, they are transferred 1:1 to the slaves. Later, during operation, it might occur that
a slave causes an alarm or event rather than the master, due to imbalanced current or slightly faster reaction.
• If one or more slaves report an device alarm, this will be displayed on the master and must be acknowledged
there so that the slave(s) can continue operation. If the alarm had caused the DC input to be switched off then
this will be reinstated automatically by the master unit once the alarm has been acknowledged
• Loss of connection to any slave will result in shutdown of all DC inputs, as a safety measure, and the master
will report this situation in the display with a pop-up "Master-slave safety mode". Then the MS system has to be
re-initialised, either with or without re-establishing connection to the disconnected unit(s) before.
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Position: not terminated (default)
►
Position: terminated
, I etc.), supervision thresholds (OVP, OPP etc.) and event settings
Min Max
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B Slave Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
Page 35