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MultiPort 4 Card
The MultiPort 4 card provides four sets of voltage-free contact closures for remote monitoring of
alarm conditions UPS operation On Battery and Low Battery condition. A typical application is to
allow a maximum of four computer systems to simultaneously monitor the status (e.g., utility power
failure-low battery) of a single UPS.
This card is supported in any of the three Liebert IntelliSlot
Figure 70 MultiPort 4 card pin assignment
UPS
12.2
LBS Mode—Load Bus Synchronization
The function of LBS is to keep the output of two independent UPS systems (single unit or multiple
unit) in synchronization even when the two systems are operating in different modes (bypass/
inverter) or on batteries. It is usually used with a Static Transfer Switch connected to the critical load
to achieve dual bus configuration.
NOTE
In LBS configuration, both units must be supplied from the same utility source.
12.2.1 Remote Alarm Monitor
Status and alarm conditions are available on an optional remote alarm monitor (RAM) panel, which is
driven by volt-free alarm status contacts (from an optional relay alarm board).
12.3
Replacing Dust Filters
1. Open the UPS door.
2. The dust filters are behind the door. For each filter, there is a bracket on either side holding the
dust filter in place, as shown in Figure 71.
3. Remove one bracket and loosen the other. The second bracket need not be removed.
4. Remove the old filter and replace with the new filter.
5. Reinstall the bracket that was removed and tighten the other bracket.
Figure 71 Dust filter replacement
®
™
Liebert
NX
CPU
CPU
CPU
CPU
Bracket
Sems screw
bays on the Liebert NX
®
Pin
1
2
3
4
5
6
7
8
9
109
.
™
Assignment
Description
Low Battery
Not Used
Not Used
Not Used
Not Used
Not Used
Low Battery Common
Utility Fail Common
Utility Fail
Bracket
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