Options
59
Liebert
®
NXL
™
3.3
Remote Alarm Status Panel RAS
The Remote Alarm Status Panel (RAS) uses LED status indicators that allow the operator to monitor
the UPS.
The main purpose of the Remote Alarm Status Panel option is to report the status of the load and the
UPS. To interpret the LED indicators, see
The RAS also includes:
1. An audible alarm
2. Lamp Test/Reset push button to test the LED indicators
3. Audio Reset push button to silence an audible alarm
3.3.1 Lamp Test/Reset Push button
The Lamp Test/Reset push button is used to verify that each LED indicator is in working condition
and to reset an LED indicator that has been triggered by a condition at the load or UPS.
To test the LEDs, press the Lamp Test/Reset push button. This lights all of the LED indicators for
visual inspection.
If an LED indicator does not respond to the lamp test, contact your local Emerson Network Power
representative for assistance.
To reset an activated LED, press the Lamp Test/Reset push button.
3.3.2 Audio Reset Push button
The Audio Reset push button is used to silence an audible alarm that has been triggered and reset the
alarm to activate on the next alarm condition.
After correcting the alarm condition, press the push button to reset the audible alarm.
3.4
Digital Load Bus Sync
3.4.1 System Description
Liebert’s Load Bus Sync
™
(LBS) option keeps the output of two or more independent Uninterruptible
Power Systems in synchronization, even when the systems are operating from different power
sources. The Liebert LBS works by synchronizing the Designates Slave System (DSS) to the output of
the Designated Master System (DMS). There are no other connections between the logic or controls of
either UPS. This ensures maximum system independence and reliability.
Table 4
RAS indicators
LED Name
LED Color
Meaning
Load on UPS
Green
The load is fully protected and no alarm conditions are present. The UPS
is supplying uninterrupted power to the load.
Load on Bypass Alarm
Red
Power to the load is bypassing the UPS. The UPS is no longer supplying
power to the load.
Battery Discharge Alarm
Red
The DC source is providing power to the UPS.
Low Battery Reserve Alarm
Red
DC source capacity is low and has reached the low-battery alarm setting.
Overload
Red
System load has exceeded the system rating.
Ambient Overtemp
Red
UPS inlet cooling air temperature has exceeded the specified limits.
System Summary Alarm
Red
An alarm has occurred at the UPS.
New Alarm Condition
Red
A second alarm has occurred at the UPS. The New Alarm Condition LED
lights when the UPS Alarm Condition LED has been triggered and has
not been reset.
Содержание Liebert NXL 250 kVA
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