Chapter 12 – Additional Equipment Liebert Hipulse E User Manual
Single or '1+N' UPS System
Page 12-2 (07/04)
12.1 LBS Control System
The simplest way to create a dual-bus system is with Liebert’s exclusive Load Bus Sync (HiSynch) option, which keeps
two or more UPS systems in sync, even when operating on batteries or asynchronous gensets. Each UPS powers its
own downstream distribution equipment, so that each piece of load equipment can be connected to both.
With the correct transfer devices, any connected load can be switched transparently between sources, so that one
complete UPS and distribution system can be powered down for maintenance.
12.1.1 OPERATOR CONTROLS
Operation of the LBS has deliberately been kept as simple as possible. There are only three controls and five indicator
lights on the LBS enclosure. The indicators are:
A. LBS Enabled. Indicates that the load bus sync circuitry is in the Automatic mode.
B. System Non-Sync. Indicates that the DSS is no longer in sync with the DMS. This alarm will indicate during the
transition from internal bypass sync to DMS sync.
C. LBS Active. Indicates that the LBS circuitry has taken over the sync of the UPS. If the System Non-Sync
indicator is also on, it means that syncronization is in process.
D. Load 1 Sync to Load 2. Indicates that the UPS critical bus is synchronized to the bypass input of the DMS, in
this case UPS #2. This indicator will turn on when the sync process is complete.
E. Load 2 Sync to Load 1. Indicates that the UPS critical bus is synchronized to the bypass input of the DMS, in
this case UPS #1. This indicator will turn on when the sync process is complete.
F. All indicators mentioned above are supplied with volt free contacts for remote monitoring.
Standard LBS controls are:
A. Mode Select Switch. Provides manual selection of automatic operation or “Off” modes. In the Automatic mode,
the LBS will be enabled. In the Off mode, both UPSs will synchronize independently.
B. Master Select Switch. Provides manual selection of the DMS source. The LBS circuitry will automatically
switch DMS sources should the initially selected DMS lose its bypass input.
C. Lamp Test. Push this button to test indicator lights.
12.1.2 OPERATOR PROCEDURES
The only two operator controls are the Mode Select Switch and the Master Select Switch. The Mode Select Switch can
be left in the Automatic position all the time. The Off position can be selected at times when it is desired to let the UPSs
synchronize independently.
The Master Select Switch allows the operator to choose which UPS bypass source will provide the reference sync
signal.
In normal operation, both UPS systems will be functioning and the LBS Mode Select Switch will be in the Automatic
position. The LBS Enable indicator will be lighted, as will one of the indicators for Load X Sync to Load Y. If the two
UPS drift out of sync (while on generator or battery, for example), the LBS Active and System Non Sync indicators
will be lighted. The Load X Sync to Load Y indicator will be off during the synchronization process and turn back on
when the process is complete.
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