Power Supply Module and Backup Battery
3-9
LED Name Description Status
DO Digital Output Control
LED
Power to relays is enabled (12V DO Control plug is
connected) – LED ON – Green
Fault state (12V DO Control plug is disconnected
but power to relays is enabled) – LED ON – Red
Power to relays is disabled (12V DO Control plug is
disconnected) – LED OFF
BATT Battery LED No battery/thermistor - LED OFF
Battery is fully charged (charging current <20mA) -
LED ON - Green
Battery is being charged (charging current >20mA
and <600mA)- LED ON – Green/Orange Blinking
Battery is being charged (charging current >600mA)-
LED ON – Orange
Battery is discharging (battery voltage is higher than
voltage of power supply) - LED ON – Red
Power supply is limiting the battery charging current
when main power is applied - LED ON – Red
Battery charging current is stabilizing - LED ON –
Orange Blinking
When battery capacity test is being performed - LED
ON - Green Blinking.
Battery tests are performed using the STS Hardware
Test function or the user application program.
Redundant Power Supply
Redundant power supplies are used to ensure a continuous supply of the required RTU
voltages, in the event that one power supply fails. For details on the redundant power supply,
see Appendix E: CPU and Power Supply Redundancy below.
Battery Charger
Power supply modules with a battery option support a 6.5 or 10 Ah Lead-Acid battery. The
power supply automatically switches to the backup battery as a 12V DC power source for the
RTU and communications when the main AC or DC power source fails.
Power supply modules with a 12 VDC smart battery charger option charge the backup battery
when not in use, and protect the battery from over-discharge. The charger performs battery
tests/diagnostics, including controlled battery discharge, when requested by the user. If the
battery is failed, the charger will not charge it and will send a failed status signal to the CPU.
If the battery is remotely located, long battery cables can be used.
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