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Status Indicators
UPS Front View
Green indicates the UPS is on utility power. Yellow indicates the UPS is on battery
power.
Green indicates DC output power is provided by the battery or utility power.
Red indicates that the battery is not connected or the battery needs to be replaced.
Refer to the Battery Replacement section.
Communication Signals
The PowerShield communication signals are isolated from its internal circuitry via open collector
opto-coupled transistors. The connection labeled “Signal Return” is a common return point for all
communication signals. In the typical application, the attached equipment digital ground connects to
Signal Return, and pull-up resistors turn the open collector signals into logic levels.
+Voltage output
Voltage output
Signal return.
Low when operating from utility line. Open when operating from
battery.
Low when battery is charged. Open when battery fails the Self Test.
Low when battery is present. Open when battery is missing.
Low when battery is near full charge capacity. Open when operating
from a battery with < 20% capacity.
Cold Start
Use the cold start feature to apply power to the UPS and connected equipment when the UPS is off
and there is no utility power. The battery must be charged for the cold start feature to work. To
utilize the cold start feature, use a small pointed object to press the recessed cold start button.
Status Indicators