SECTION III
Operation
Page 3.5
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3.4 Digital Monitoring Panel (continued)
3.4.1 Indicator Lights (continued)
This condition may occur when the UPS is loaded close to 100% and a large
disk drive or other motor load is started. These loads draw currents many times
their normal level for a few seconds when first started. The UPS is designed to
handle this short overload condition.
• Transferred to Bypass
(red) - An indication that the critical load is being
powered directly from the UPS bypass power source. This situation is created
when maintenance personnel want to bypass the UPS through the static bypass
switch for routine maintenance or when an abnormal condition exists in the
inverter, such as failure or extended overload. When in this operational mode, the
critical load does not have UPS protection.
• Transfer Not Available
(red) - An indication that transfer to the static
bypass switch is not possible. This may be caused by the UPS bypass input power
source being out of specification or a power outage.
• Battery Not Available
(red) - The battery’s DC Disconnect (circuit breaker)
is open or a battery cabinet fuse is blown. The battery is not available to power the
inverter if needed.
• Retransfer Inhibited
(red) - An indication that the inverter is out of
specification or has lost phase lock with the bypass power source. When active in
conjunction with the Transferred to Bypass indicator, power can not be
retransferred from the static bypass switch back to the inverter.
3.4.2 Message Screens
Message screens display the status of the UPS. To scroll through these
screens, depress or
buttons beneath DISPLAY SELECT.
Following are the legends that appear in
this area while the UPS is running normally. To
display these in this order, start with the screen
at right and depress the button to show each
screen in turn.
UPS
Operating
Normally
