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Heinzinger electronic GmbH
Phone: +49 (0) 8031 2458 0
www.heinzinger.com
Anton-Jakob-Str. 4, 83026 Rosenheim
Fax: + 49 (0) 8031 2458 58
Germany
Page 111
ERS COMPACT
3.12.1.7
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 terminal. The slaves will fall back to single operation mode
and also switch off their DC terminal. The MSP alarm can be deleted by initializing 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 one or more slave units are cut from AC supply (power switch, blackout, supply undervoltage) and come back
later, they’re not automatically initialized and included again in the MS system. Then the init has to be repeated.
•
If the master unit is cut from AC supply (power switch, blackout) and comes back later, the unit will automati
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cally initialize 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 can’t be initialized
In situations where one or multiple units generate a device alarm like OVP etc. 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 partic
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ular alarms can be read from the slave units displays or via digital interface by any software.
•
All units in the MS system supervise their own values regarding overvoltage, overcurrent and overpower and
in case of alarm they report the alarm to the master. In situations where the current is probably not balanced
between the units, it can occur that one unit generates an OCP alarm though the global OCP limit of the MS
system was not reached. The same can occur with the OPP alarm.
3.12.2
Series connection
Besides being able to work as a power supply, the device is also an electronic load.
Series connection of electronic loads must only be installed and operated after taking further
precautionary measures! Contact us for details about the feasibility of a series connection of
these devices.