Rev. A, 6/15
MND
17
Switchable Power Source Output Option*
(refer to Switchable Power wiring on pages 4-5)
This option is designed to allow an internal battery powered MND to share its battery
power (via relay T1) with one of APG’s Modbus sensors (MNU, MPX, or PT series) to
create a simple yet complete monitoring system. Pushing the MND’s power button will
wake the system from sleep mode, poll the sensor reading, and then re-enter sleep
mode a few seconds later.
The Switchable Power option utilizes Relay T1, which is set to the Timed Relay mode, to
control the voltage to the sensor. Setting the Interval Time to 0 will force the T1 to active
and supply power to the sensor immediately when the MND wakes from sleep mode.
The On Time setting determines how long power is supplied to the sensor. APG recom
-
mends an On Time of 8-10 seconds to allow the sensor enough time to power up and
get a reading. The Auto-Off setting determines how long the MND will remain powered,
displaying the reading, before re-entering sleep mode.
The following are APG’s recommend settings for using this feature:
Output Menu (OUTPUT):
Trip 1 Type (T1TYPE) = Timed Relay (TIME R)
Interval in minutes (INTMIN) = 0
On Time in seconds (ON SEC) = 8-10
Advanced Menu (AdVSET):
Auto-Off = 15 seconds
WARNING!
The Switchable Power option sources battery voltage directly to the
output line whenever the display is powered “on”. Care must be taken
not to short this voltage to any of the other output lines (DC common
or the A and B communication lines).
*The Switchable Power Source Output option requires a special hardware configuration
from the factory and is not a standard MND feature.
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