User guide
CHAPTER 2 CONNECTING POWER AND SURGE PROTECTION 23
Warning
Make sure power to AC mains is disconnected while wiring the AC input. If your in-
stallation does not require AC power, you will need to use surplus DC power inside
the trac cabinet. In this case, Wavetronix recommends you use the Click 221 (8 A
DC surge protector) to protect the backplate and SmartSensor Matrix units from DC
surges. See Appendix C for information regarding the Click 221.
Figure 2.2 – Connecting AC Power to the Preassembled Backplate
Use the following steps to connect power to the AC terminal block on the bottom DIN rail
(see Figure 2.2):
1 Connect a neutral wire (usually a white wire) to the bottom side of the terminal block
labeled “N” for neutral.
2 Connect a ground wire (usually a green wire) to the bottom of the terminal block la-
beled “G” for ground. (see the Wiring Protective Earth Ground section below).
3 Connect a line wire (usually a black wire) to the bottom of the terminal block labeled
“L” for line.
4 Turn on AC mains power.
5 Press the circuit breaker switch on the le side of the top DIN rail to switch power to
the backplate. e switch is on if the button is below the level of the device housing; the
switch is o if the button is raised above the surface of the housing.
6 Verify that DC power is properly regulated by making sure the DC OK LEDs are il-
luminated on the Click 201/202/204.