Wavetronix SmartSensor Matrix (SS-225) - User Guide - Manual (Page 109)

108 APPENDIX
Follow the steps below to provide a low impedance protective earth connection:
1 Connect one end of a protective earth ground wire to the bottom of the PE terminal
block. A 10 AWG stranded wire is recommended for protective earth ground connec-
tions and is also the largest that will fit in the terminal block.
2 Connect the other end of the protective earth ground wire to a protective earth screw
terminal within the main traffic cabinet.
Controlling DC Power Distribution
The Click 210 circuit breakers provide a convenient way to turn power on or off for each
sensor independently (see Figure D.4). To enable or disable DC power to the backplate,
switch the main circuit breaker (left side of upper DIN rail); to enable or disable DC power
to an individual sensor, switch the individual circuit breaker (left side of each sensor’s set
of terminal blocks).
Push this
button to
turn power
on or off
Figure D.4 – DC Power Distribution
Note
The switch is ON when the switch button is level with the device housing; the switch
is OFF when the switch button is raised above the housing.
The four-approach preassembled backplate has 24 VDC power wired from the output of
the AC to DC converter into a 5-position screw terminal on the left side of the T-bus (see
Figure D.5). The green T-bus conducts DC power and RS-485 communications from the
left to the right side of the modules; the gray T-bus conducts only DC power from the left
to the right side of the modules.