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LED Name
DO
BATT
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.
Description
Digital Output Control
LED
Battery LED
Power Supply Module and Backup Battery
Status
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
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.
3-9
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