User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 85 ALARMS
12 ALARMS
12.1 A LARMS O VERVIEW
The alarms facility of Solar is a useful feature especially for the smaller systems. It is designed to
alert the user by means of an alerter device connected to a Central NI to a situation designated as
requiring attention. Configuration of the alarms facility and any subsequent analysis into the nature
of an alarm requires use the TM ET and, therefore, is not recommended for use by non-
engineering staff. Whilst alarms may originate from a NI, the NI does not generate the alarm
condition. It is the report of a state change (an event) from a NI to the TM, as part of the normal
supervisory process, which will cause the TM to raise an alarm if that event has been so
designated, i.e. the alarm process lies entirely within the TM domain.
On larger systems or for more comprehensive system monitoring, the use of SNMP is strongly
recommended. SNMP will provide control of many aspects of a Solar network as well as being
able to take/accept user definable fault conditions. Full information on SNMP is provided in
Section 14 – SNMP .
12.2 A LARM F UNCTIONALITY
There are a number of designated events in a NI and a TM that may be selected to operate as
alarm initiation events. When an event is selected and that event is active, a flashing Red
indication will be displayed on the ET to alert the user to the presence and source of the alarm.
An external indication of an alarm being active can be obtained from the ‘Isolated Output #2’ on a
Central NI when it is set to operate in the ‘Auto’ mode. The alarm condition will then operate that
relay in the Central NI for the channel that is exhibiting the alarm. If the alarm is from the TM itself
making it channel independent, ‘Isolated Output #2’ will be activated on every Central NI
configured for an alarm output.
12.3 A LARM S ETUP (TM ET O NLY )
Although the majority of alarms are likely to originate from NI, there is no facility to alter or examine
the alarm settings from the NI ET, as the alarm settings are managed and maintained by the TM
from the status information passed to the TM through the supervisory sub-system. The events that
may be selected to generate the alarm condition are set on a unit by unit basis through the
engineering facility.
Events that can be configured to generate an alarm condition are selected by opening the ‘Alarms’
page (the ‘Alarms’ tab) of the item and selecting the event(s) as required from the following:
(a). Environment Inputs – ‘Environment’ page.
(b). Isolated Inputs (NI only) – ‘Signalling’ page.
(c). Network Status, 1PPS Status and PLL Status – these comprise the ‘Misc Alarms’ on the
‘Facilities’ page of the NI.
(d). Duplication Status, 1PPS Status and Facility Key Status – these comprise the ‘Misc Alarms’
on the ‘Facilities’ page of the TM.
Before any change or selection can be made, the ‘Eng’ button must be selected and the ‘Apply’
button used to confirm the selection.