SymphoniePRO User Manual
Rev. 8
support@nrgsystems.com | Page 73
11 January 2018
4.5.1 Wiring Sequence
Pass sensor wires through the black plastic grommets in the bottom of the shelter box.
All wires coming down the tower and into the shelter box should be secured to the tower below the shelter box
and then brought back up, to form a drip-loop, before entering the shelter box.
Sensor wires should be stripped to expose only 5 mm (1/4 inch) of bare wire. Stripping off more insulation could
allow the wires to touch and cause an electrical short. If using standard NRG Systems sensor cables, you may
need to trim off some of the exposed wire.
Note - Labeling sensor wire ends with either the sensor name or its intended channel number during sensor
installation will minimize confusion and speed up the wire connection process. Connecting the bottom row of
sensors to the wiring panel first may make installation easier.
Connect sensor wires to the field wiring panel according to the connection diagram (see below) using the
following sequence for each sensor:
1.
Touch the shield wire to the wiring panel’s grounding post, and connect it to the SHD (shield) terminal.
2.
Connect the sensor ground wire (typically black wire) of the sensor to the “GND” terminal of the
appropriate channel’s input.
3.
Connect the signal (white or clear) wire to the “SIG” (signal input) terminal.
4.
For sensors with three terminal ONLY (such as vanes or anemometers requiring 2.5 V, 5 V, or 12 V
power), connect the red wire (excitation/power) to the “EXC” terminal.
After all sensors and the logger have been connected to the wiring panel:
Confirm correct wiring by reviewing each sensor channel on the logger’s display.
Coat the wiring panel’s terminal screws with an anti-corrosive product (such as PreserveIT P100L from
Caig Labs or Vaseline petroleum jelly).
Once you have completed wiring, use plumber’s putty to seal around wires entering the shelter box.
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