11.2.1 RCU Power Source
The power source setting tells the RCU which terminal block it should expect to receive power
from. Setting options are:
Mains (including VT)
Solar
11.2.2 Lead Acid Battery Replacement Interval
The purpose of this setting is to alert the control centre when RCU batteries require
replacement due to being in service for a long time. The setting is the number of days of
battery service that indicates end of useful battery life. If the battery has been in service for
longer than the setting DPID 2 (RCU - Battery Needs to be Replaced) database point is set
which can be monitored by the SCADA system.
The range of values available are from 365 – 3650 days.
Most utilities have experience of this type of battery in this type of application (for example
automatic circuit reclosers typically use the same type battery) and have maintenance
schedules which are appropriate. In this case the battery replacement period should be set to
match the field experience and maintenance schedule
In the absence of this field experience Siemens recommends:
For solar installations the maximum battery life should be set to 1460 days (4 years) or less
due to the day/night cycling of the battery.
For cooler climates where daily peak temperatures very rarely go above 30
O
C and usually
stay below 25
O
C, battery life of 1825 days (5 years) is appropriate.
For hotter climates where the daily temperature regularly goes above 30
O
C battery life of
1460 days (4 years) is appropriate. Maximising the shading effect of the power pole is
essential to achieve this battery life.
For very hot climates where most of the day is spent at high temperatures and night
temperatures are also high then battery life will be reduced further. Refer Siemens Service
Centre for alternative battery options.
11.2.3 Solar Low Performance Time
This is a threshold setting that is the number of consecutive days of low solar power input. If
the threshold value is exceeded an event is created in the RCU database and transmitted via
the SCADA system. The purpose of this setting is to alert the control centre of a damaged or
dirty solar panel requiring maintenance. This setting is only applicable if the Power Source
option is set as Solar. Values in the range of 2-10 days are available. Recommended value is
5 days.
11.3 Condition Based Command Settings
The RCU configuration has parameters that allow configuration of the excessive cleared faults
functionality (Fusesaver installations only). These are:
The time window size specified in seconds (maximum of 65535 seconds, 18.2 hours),
the number of cleared faults that occur within the time window (maximum of 16)
11.4 Operator Control Panel Settings
11.4.1 Enable Operator Control Panel
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