Elektro-Automatik ELR 9000 Betriebsanleitung Seite 174

ELR 9000 Series
3.10.2.6 Alarms and other 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 regulations have
been defined:
• Generally, if the master loses connection to any slave, it will generate an MSP (master-slave protection) alarm,
pop up a message on the screen and switch off its DC output. The slaves will fall back to single operation mode,
but also switch off their DC output. The MSP alarm can be deleted by either initialising the master-slave system
again. This can be done either in the MSP alarm pop-up screen or in the MENU of the master or via remote
control. Alternatively, the alarm is also cleared by deactivating master-slave on the master unit
• If the DC part of one or more slave units is switched off due to defect, overheating etc., the whole MS system
shuts down the power consumption and human interaction is required.
• If one or more slave units are switched off on the AC side (power switch, supply undervoltage) and come back
later, they're not automatically initialised and included again in the MS system. Then the init has to be repeated.
• 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 the master unit is switched off on the AC side (power switch, supply undervoltage) and comes back later, it
will automatically initialise the MS system again, finding and integrating all active slaves. In this case, MS can
be restored automatically.
• If accidentally multiple or no units are defined as master the master-slave system cannot be initialised.
In situations where one or multiple units generate a device alarm like OV, PF or OT following applies:
• Any alarm of a slave is indicated on the slave's display and on the master's display
• If multiple alarms happen simultaneously, the master only indicates the most recent one. In this case, the particu-
lar alarms can be read from the slave units displays. This also applies for remote control or remote supervision,
because the master can only report the most recent alarm.
EA Elektro-Automatik GmbH
Page 84
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de