GE Industrial Solutions Galaxy Pulsar Edge - Manual (Page 117)

Galaxy Pulsar Edge Power System Controller
Issue 3 October 2011
117
ID Switch
A seven-position rotary ID switch is used by the Pulsar Edge to uniquely address 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 with QS873 VT Probes
ES771As require the use of QS873 VT Probes to activate the mid-string voltage monitoring
feature in the Pulsar Edge. One VT probe is required for each mid-string voltage being
monitored. Additional VT probes can be added for individual battery temperature measurement.
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 installed. Additional ES771A modules can be added or replaced in the field
as necessary. The following figure depicts a typical configuration where four battery strings are
monitored with a minimum number of VT probes. The middle battery in each string is used when
both the voltage imbalance and thermal compensation features are desired. This is one of many
configurations using the ES771A for monitoring. Consult technical field support if questions or
concern arise.
Figure 6-4: Four-String System Monitored For Imbalance with One VT Probe per
String
Voltage Imbalance Mid-String Monitoring