ABB Pulsar Edge - Page 105

Page 105
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Autonomous Backup LVD Function: Monitor system bus voltage for backup LVD function (in case of
loss of communication to the QS871As or failed or removed controller ). The configured disconnect and
reconnect values assigned to a particular LVD function are sent from the controller to each respective
QS871A. In the advent of a controller failure the QS871As will utilize their individual voltage monitoring
and these thresholds to disconnect and reconnect the contactor.
7-Position ID Switch: Rotary 8-position switch that uniquely identifies up to seven remote distribution
monitor and control modules. ID position 0 is invalid. The Pulsar Edge can address up to eight unique
distribution monitor and control modules.
Note: The majority of applications that utilize the QS871 utilize the QS871A. There are versions of the
QS871 that are used in special applications where components have been removed because the feature
was not required. These versions and the feature set are high-lighted below.
Connector Definitions
The QS871A module has five connectors: two RJ-45 connectors used for serial communication to
ES773A VT-Probes, ES771A Remote Voltage Monitoring Modules, and the Pulsar Edge Pulsar Edge
controller and three connectors for monitoring circuit breakers, contactors and shunts. The connectors
are defined as follows.
Feature QS871A QS871B QS871C
Inputs
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Misc
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X X
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X X
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X X
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X X
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Connectors
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