Installation and Operating Instructions – 1000V BUSS, Grounded (125A to 400A)
950-003342-000 Rev B
51
Appendix B
Bentek Zone Monitoring
System using an RS-485
Interface
The Bentek Zone Monitoring System is also referred to as the Current Sense
feature. It is an advanced, high-reliability system with a networked Modbus
(RS-485) interface that provides current monitoring for up to 20 individual
source circuits from a PV array into the BUSS. Monitoring allows PV system
operators to identify system performance problems such as tripped breakers,
shading issues, and panel performance. The BUSS monitoring values reported
may be at variance with other monitoring devices on the circuit due to system
design or other factors and should not be considered absolute.
The Zone Monitoring System utilizes a RS-485 interface running the Modbus
RTU protocol. The default Modbus address is 01. Typically a data cable is
connected to the RS-485 connector and terminates in the main operations
building, where the output can be observed.
The Bentek Zone Monitoring System consists of four parts:
Analog Input Module—Multi-channel analog input to measure current and
convert from an analog to digital value; the RS-485 connector is part of this
module.
Current Sensors—200A or 400A current sensors for each input. A Current
Sensor is located on each of the circuit breakers. These current sensors are
connected by a wire to the Analog Input Module.
Power /-15VDC power supply for the Analog Input Module and
Current Sensors.
Wiring Harness—Carries signals from transducers and supplies power to the
components of the Zone Monitoring System. The Current Sensors are
connected to the power supply and to the Analog Input Module through the
wiring harness.
The Bentek Zone Monitoring System is preconfigured and installed in your BUSS
at the factory. You need to provide power with a separate disconnecting means
to the Power Supply, as described in
“Connecting the Fan and Zone Monitoring