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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
®
bays on the Liebert NX
™
.
Figure 70 MultiPort 4 card pin assignment
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.
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
NOTE
In LBS configuration, both units must be supplied from the same utility source.
UPS
CPU
CPU
CPU
CPU
Pin
Assignment
Description
1 Low Battery
2Not Used
3Not Used
4Not Used
5Not Used
6Not Used
7 Low Battery Common
8 Utility Fail Common
9 Utility Fail
Bracket
Sems screw
Bracket