Lucent Technologies Lineage
®
2000 ECS-12U Controller J85501E-2
Issue 3 July 1998 Product Description 2 - 13
A shunt isolator circuit is required in applications where the
plant shunt is located in the distribution power bus (hot lead) or
if the shunt size is not compatible with the controller (see Section
4, “Shunt Isolator Circuit”). See Table 4-B for a listing of
compatible shunts.
The ammeter scale for the particular plant shunt size is selected
by DIP switches on the 113B. Scales are provided for the most
common shunt ratings and range from 6 amperes per millivolt to
160 amperes per millivolt (See Section 4, “Hardware Setup,”
and Figure 4-5 for details.)
Front Panel Test
Jacks
Test points are provided on the front panel so that the plant
voltage may be checked with the user's meter. However, the
accuracy of the LCD voltmeter on the front panel, at 0.05%, is
better than that available with most hand-held meters. The test
points are current-limited against accidental short-circuits by
test probes.
Rectifier
Sequence
Control Interface
When the battery plant's ac power is backed up by an engine
alternator of limited capacity, it is often necessary to control the
number of rectifiers on line during a commercial ac outage. To
avoid stalling the engine during start up or overloading it at
steady-state, it may be necessary to turn off rectifiers
temporarily. This operation of turning rectifiers off and back on
during engine start up is called rectifier sequence control.
The controller may be connected to the four output signals (TR1,
TR2, TR3, and TR4) provided by an external rectifier sequence
controller. These signals are used to turn off rectifiers or groups
of rectifiers.
Since sequence control is typically part of the ac engine system
rather than part of the dc battery plant system, the rectifier
sequence controller is often outside the battery plant and
interfaces with the rectifiers through the battery plant controller.
The controller equipped with CP2 is capable of rectifier
sequence control without an external rectifier sequence
controller. However, a signal to indicate that the plant is being
powered by the reserve system is still required. (See ECS
Controller Options Product Manual, Select Code 167-790-109.)
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