User guide

CHAPTER 2  CONNECTING POWER AND SURGE PROTECTION 25
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 t in the terminal block.
2 Connect the other end of the protective earth ground wire to a protective earth screw
terminal within the main trac cabinet.
Controlling DC Power Distribution
e Click 210 circuit breakers provide a convenient way to turn power on or o for each
sensor independently (see Figure 2.4). To enable or disable DC power to the backplate,
switch the main circuit breaker (le side of upper DIN rail); to enable or disable DC power
to an individual sensor, switch the individual circuit breaker (le side of each sensor’s set
of terminal blocks).
Push this
button to
turn power
on or o
Figure 2.4 – 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.
e 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 le side of the T-bus (see Figure
2.5). e green T-bus conducts DC power and RS-485 communications from the le to the
right side of the modules; the gray T-bus conducts only DC power from the le to the right
side of the modules.