SECTION III
Operation
Page 3.4
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3.4 Digital Monitoring Panel (continued)
3.4.1 Indicator Lights
The Indicator Lights (LED’s), located in the upper part of the panel, are:
•
UPS Normal
(green)
-
This indicates that the critical load is being powered
from the inverter. The LED normally is on and, when this is the only LED lighted
on the panel, it represents a fully normal condition. Other LED’s may also be
lighted simultaneously indicating a problem with the UPS. When this occurs, first
record the alarm(s). Then, depress the ALARM SILENCE button to reset the alarm
circuitry. Any alarm LED’s will go out when the alarm condition is corrected. See
Paragraph 3.4.5 for more details.
If “UPS Normal” flashes slowly, this indicates that a non-critical alarm is
present, and that message will appear on the message screen. Check Alarm
History (Paragraph 3.6.2) to identify the alarm.
•
AC Input Failure
(red)
-
The UPS input power has been disrupted or gone
out of specification limits. The system goes to battery power and the alarm sounds,
alerting the operator to a brownout or power failure. When the batteries run down,
the critical load will shut off unless steps are taken to correct the situation or
another source of input power is provided.
•
Low Battery Voltage
(red)
-
When the system is operating on battery
power, this LED illuminates to show approximately five minutes remains before
the UPS system shuts down. A message screen (shown on Page 3.6) displays the
amount of battery run time left. Also, the link (battery) voltage maybe monitored
(See Paragraph 3.4.2.6). Shutdown occurs when the link voltage drops to 178VDC
(15-30kVA) or 297VDC (37.5-300kVA). If utility power can not be restored or an
auxiliary power source be activated, the critical load should be shut down in an
orderly procedure.
•
UPS Overload
(red)
-
The load on the UPS output is in excess of 105% of
rated load. If the condition exists for more than a few seconds, enough of the
critical load should be powered down or removed to make the indicator go out.
Otherwise, the UPS will shut down and/or transfer to bypass within 15 minutes. If
the indicators are set to latch, the ALARM SILENCE button must be depressed
twice to clear it.
