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CHAPTER 7 – COMMUNICATION
7.1 INTRODUCTION
The PowerPro ELXA system offers a range interfaces that can be connected to external facilities
management and monitoring systems. Many of these options are factory fitted and must be requested at
the time of order.
7.1.1 SYSTEM TEST (ST) – INCLUDED
The System Test (ST) facility is used to test the PowerPro ELXA operation on battery power and terminals
must be normally closed. In this case, if the connection between the ST terminals goes open-circuit it
turns off the rectifier and the load is operated from the inverter using the standby battery power.
The ST function can be connected to a local or remote operating device (switch). The ST terminals send an
internal 24V signal internally and therefore no voltage can be applied to the circuit.
When using a remote test facility they should be connected using a screened cable with 1 pair (0.5 mm²)
and maximum length of 100m.
Note: If an external ST circuit is not required, a link must be fitted to the ST terminals.
7.1.2 DRY PORT CONTACTS - INCLUDED
The PowerPro ELXA provides three hard-wired 'system status'
outputs that can be used to drive remote signalling and/or
monitoring facilities. These output are switched by volt-free
relay contacts and are normally open (closed on activation).
The contacts are rated for 110VAC (0.5A) or 24VDC.
As shown in Figure 7.2, the four switched alarm outputs are:
• Mains Failure
• Common alarm
• Battery voltage low
Connections to these terminals are via the 4 provided Din-Rail terminals
7.1.3 SNMP CARD – OPTIONAL EXTRA
Simple Network Management Protocol (SNMP) is a world-wide, standardised communication protocol
that can be used to monitor any network-connected device via a simple control language and display the
results in an application running within a standard web browser.
An SNMP card is factory fitted option, designed to house a Modem/Ethernet SNMP adapter card, is
located on top of the power module if fitted.
The SNMP adapter card contains an RJ-45 Ethernet connector which allows the PowerPro ELXA to be
connected to a network using a standard CAT-5 network cable. Once connected, the system management
software agent that is preinstalled in the SNMP adapter monitors the PowerPro ELXA operation and
outputs its data in SNMP format to the connected network.
The communication exchanged between the PowerProE ELXA and network enables event/alarm emails,
server shut down (with optional licenses) and other tasks to be performed. It can also be integrated with
BMS software over a local area network (LAN) for SNMP or Modbus information over IP.
The SNMP adaptor requires a PC with terminal connections, and for normal operation at least one
Ethernet connection.
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