User Manual

Page 69
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
ELR 9000 Series
The initialisation process of the master and the master-slave system will, so long as MS mode
is still activated, be repeated each time the units are powered.
Initialisation can be repeated at any time via MENU / GENERAL SETTINGS / PAGE 9.
3.9.1.4 Operating the master-slave system
After successful conguration and initialisation of the master and slave units, these will show in their displays “master”
or “slave” in the status area. The slaves can no longer be operated manually and are not remotely controllable via
either the analog or digital interfaces. They can, if needed, be monitored by reading the actual values and status.
The display on the master unit changes after initialisation and previous set values are reset. The master now dis-
plays the set and actual values of the total system. Depending on the number of units, the total current and power
will multiply. 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
• 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 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
3.9.1.5 Problem situations
Master-slave operation, due to the connection of multiple units and their interaction, can cause additional problem
situations which do not occur when operating individual units. For such occurrences the following provisions have
been made:
• If the DC part of one or more slave units is switched off due to defect, overheating etc., the remaining units con-
tinue functioning, but the total performance is reduced. The master recognizes that the number of slaves has
changed and re-initialises accordingly
• If the DC input of the master unit is switched off due to a defect or overheating, then the total master-slave system
can take no input power and the DC input of all slaves is automatically switched off, too
• If accidently multiple or no units are dened as master the master-slave system cannot be initialised