Cellwatch Frontier - Configuring Current Transducers (CT)

Cellwatch Frontier System Installation & User Manual
Section III – Configuration Build and Hardware Integration Guide-98
Configuring Current Transducers (CT)
Configuration settings for current transducers are accessible under the Settings menu in the Navigation
Bar.
Terminology and Implementation
Multiple CTs can be assigned to a single string to combine readings
into a single value. Physical and Logical CTs will not be addressed
in the web interface but it is important to know how the data is
being returned and why multiple CTs can be assigned to a single
string.
The explanation of terminology is below:
Physical CT
A physical CT is each current transducer hardware component that
is plugged into a port on the Frontier unit.
Logical CT
A logical CT is the current output shown through the web interface or communication protocol. This
output can be the combination of multiple physical CTs. When using a CT for monitoring charge current
and another CT for monitoring discharge current on the same string, these two readings can be shown
as a single reading for the string since only one of the two measurements will be used at any time during
the operation of the battery. When the string is in discharge, the current output relies on the CT
assigned for monitoring discharge. When the string is charging, the current reading displayed is the
output from the charging CT. The charge CT will generally have higher resolution at lower current values.
In summary, the logical current output for the string switches between the two CTs depending on the
present state of charge/discharge. This gives a higher resolution of the current reading and integrates
the functionality into a single output for ease in monitoring.
Type and Assignment
The CTs selected in the Battery Design wizard are available to be configured by Type and Capacity.
Frontier allows the use of different styles of CTs and different monitoring capabilities.