Obvius A89DC-08 - Manual (Page 4)

Overview
The A89DC-08 DC current monitor system is designed to allow measurement and alarming of DC current applications
including solar pv arrays, battery monitoring and DC power supplies for telecom switch gear.
The A89DC-08 uses 8 non-contact DC Hall Effect sensors to measure DC current on each of the 8 channels. DC current can
be measured in both directions, showing positive and negative numbers in the resulting measurement values. Data values are
made available via RS485 serial using the standard Modbus RTU protocol.
In addition to reporting the current values of each channel, the A89DC-08 also provides alarm functions to monitor
imbalances between channels. This feature is instrumental in detecting failed equipment in applications such as Solar PV
arrays.
Applications
The A89DC-08 DC Current Monitor has several applications. These include:
● DC Load Monitoring.
● Solar PV Power Generation
● Battery Charge and Discharge monitoring.
Installation Checklist
An A89DC-08 system installation has the following components:
Required hardware
● A89DC-08 DC current monitor (required)
● 24VDC power supply
● Data connection to a Modbus master device such as an AcquiSuite, ModHopper, PLC or computer software such as
the Obvius Config Console.
● Enclosure for the A89DC-08 DC to satisfy UL safety requirements.
● Shielded twisted pair wire for communications.
Note: If using the Obvius Config Console software, an RS232/DB9 or RS48555 serial cable will be required to attach the
A89DC-08 to the computer.
Page 4 A89DC-08 – DC Current Monitor