APG MND user manual - Manual (Page 16)

MND Rev. A1, 5/14
16
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Switched Power Source
This op on is designed to allow an internal ba ery powered MND to share the ba ery
power with one of APG’s Modbus sensors (MNU, MP, or MPT series) to create a simple
yet complete monitoring system. Whenever relay 1 (T1) is ac ve, the ba ery voltage
will be applied to the switched power source output (which should be connected to the
voltage input of the sensor). By se ng relay 1 to “On” and then se ng up a short Auto-
Off mer (refer to Advanced se ngs), the user can simply push the power bu on on
the MND to wake the system and poll the sensor to get the reading. The Auto-Off will
automa cally power down the system to save ba ery life. APG recommends an Auto-
Off se ng of 15-20 second in order to maximize ba ery life.
WARNING! the switched power output sources voltage directly from the ba ery, and
cau on must be taken not to let the output come in contact with any of the other
output lines (DC common or the communica on lines).