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Series 300 Load Bus Synchronization 4
SECTION 3 OPERATION
3.1 OPERATOR CONTROLS
Operation of the LBS has deliberately been kept as simple possible. There are only three controls and
five indicator lights on the SERIES 300 LBS Controller enclosure. Each LBS equipped UPS module has
one indicator light mounted on the bezel below the front display panel. The indicators are:
A. LBS Enabled. Indicates that the LBS 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 appear 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 synchronization is in progress.
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 System 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 System 1. This indicator will turn on when the sync process
is complete.
F. Warning LBS Active. This indicator is located on the bezel below the front display panel
on each UPS module. This indicator will be flashing when the DSS is acquiring sync with
the DMS. This is a warning, not to operate the Main Rotary Switch.
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 UPS modules
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 bypass
input.
C. Lamp Test. Push this button to test the indicators lights on the LBS Controller. There is
no lamp test for the warning indicators on the UPS modules.
3.2 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 desirable to allow the UPS systems to synchronize independently.
The Master Select Switch allows the operator to chose which UPS bypass source will provide the
reference sync signal.
In normal operation, both System 1 and System 2 will be functioning and the LBS Mode Select Switch
will be in the Automatic position. The LBS enable indicator and one of the Load X Sync to Load Y
indicators will be illuminated. If the two UPS systems drift out of sync (while on battery for example),
the LBS Active and System Non Sync indicators will be illuminated. The Load X Sync to Load Y
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