Power Availability PowerSure PST User Manual

MODES OF OPERATION

Normal Mode

During Normal mode operation, the Power-

Sure PST supplies conditioned, computer-

grade power to the connected equipment:

mains power passes through the TVSS cir-

cuitry, EMI/RFI filters and then through the

Transfer Switch to the connected equipment.

When the UPS is in Normal mode, the

Mains/Battery Indicator illuminates green.

The PowerSure PST continuously monitors the batteries to maintain

them in a fully charged state. The battery charger operates whenever

AC power is present, even if the UPS is switched off. The UPS per-

forms an automatic battery test after it has been operating continu-

ously for two (2) weeks.

Battery Mode

The UPS switches to Battery mode in the

event of an extreme voltage/frequency condi-

tion or complete mains failure. The battery

system supplies power through the Inverter to

generate power for connected equipment.

When the UPS is in Battery mode, the Mains/

Battery Indicator flashes green and an alarm

sounds every 5 seconds.

When a low battery condition occurs, the Battery Indicator continues

to flash green and the alarm sounds every half-second. Low battery

warning is initiated when approximately two (2) minutes of battery

run time are remaining. For more information, refer to Trouble-

shooting section.

CAUTION

Turning off the UPS while in either Normal mode or Battery

mode will result in the loss of output power.

NOTE

Once mains power is restored, the UPS resumes normal

operation. At this time, the battery charger begins recharging

the battery. The UPS is capable of OFF-State charging, i.e.,

with mains power, the UPS will charge the batteries as long

as it is plugged in.

Continuous indicator

illumination denotes

Normal Mode

Flashing indicator

illumination denotes

Battery Mode