Emerson 40-200KVA LBS Mode-Load Bus Synchronization, Replacing Dust Filters, MultiPort 4 Card

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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

CPU

CPU

UPS

CPU

CPU

	Assignment
Pin	Description
1	Low Battery
2	Not Used
3	Not Used
4	Not Used
5	Not Used
6	Not Used
7	Low Battery Common
8	Utility Fail Common
9	Utility Fail

12.2LBS 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.

12.2.1Remote 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).

12.3Replacing 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

Bracket
Sems screw	Bracket

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