Wavetronix SmartSensor Matrix (SS-225) - User Guide - Manual (Page 105)

104 APPENDIX
Note
This appendix covers the basics of the Click 221. For a full explanation of how to use
the Click 221, see the Click Series User Guide.
Outgoing DC- voltage onto the T-bus is protected from electrical surges incoming from the
DC+ and DC- screw terminals. These terminals do not have reverse-polarity protection,
but assumes that all downstream devices will have proper polarity protection. The surge
protection meets the IEC 61000-4-S 4KV (Class 4) specification.
Figure C.1 – Click 221
The LED on the faceplate will be on if the device is properly powered and the surge protec-
tion is operational (see Figure C.1). The LED will be off if the DC wires are wired backwards
(reverse polarity), the device is not powered or the surge protection circuitry is no longer
operational. If the LED flickers on an then off when power is applied, this means that the
device is conducting power, but the surge is no longer fully functional. When the surge is no
longer fully functional, please contact Wavetronix Technical Services for assistance.
Appendix D – Preassembled Backplate
The standard four-approach intersection preassembled backplate is 11 in. (28 cm) wide and
11.5 in. (29.2 cm) high. All wiring on the rack and backplates is done using stranded wires
with wire ferrules for screw terminal connections (see Figure D.1).