GE Industrial Solutions Pulsar Plus Controller - Manual (Page 97)

Pulsar Plus Controller Family
Issue 7 December 2011 97
J30
Connects the ES771A to the first QS873A VT-Probes using either the (CC848791517, 2.5’) or the
(848719829’, 10’) cables.
J1, J2, J3
Snap-fit connectors for the mid-string voltage signal wire (Brown) from the VT-Probes.
ID Switch
A seven-position rotary ID switch used by the controller to uniquely identify each ES771A in the system. A
setting of “0” produces and invalid ID alarm. Valid ID settings are from 1 through 6. Units shipped from the
factory have a factory default ID setting of “one”.
Status LED
The module illuminates its green LED when plugged into the 1-wire network and with the VT-probe attached
to negative battery terminal of the mid-string voltage. The LED will illuminate red when the controller
determines that one or more of the strings from the unit has exceeded the Mid-String Voltage threshold and
time considerations.
Application of ES771A Modules with QS873 VT Probes
ES771A modules require the use of QS873 VT Probes in order to activate the mid-string voltage monitoring
feature in the controller. One VT probe is required for each mid-string voltage being monitored. Additional
VT probes can be added for individual battery temperature measurement. It is up to the end-user to
determine the number of battery temperature probes or voltage modules other applications may require.
The highest temperature measured from all installed VT probes is utilized by the controller for slope thermal
compensation. Many factory built systems come with the ES771A modules and QS873A VT probes factory
installed, ES771A modules can be added or replaced in the field as necessary. The following depicts a typical
configuration where four battery strings are being monitored with the required minimum VT probes. The
middle battery in each string must be used when both the voltage imbalance and thermal compensation
features are desired. This is one configuration using the ES771A. Systems may be configured differently.
Consult technical field support if questions or concern arise.