User's Manual

CHAPTER 2 o CONNECTING POWER AND SURGE PROTECTION
27
If the DC power comes from a Click! 201/202 in the pole-mount cabinet that
is surge protected using a Click! 230, you can also connect power to the T-bus
using a 5-position screw terminal. To wire DC power directly into a 5-position
screw terminal (see Figure 2.8):
Connect +DC (24 VDC) to the top screw terminal. 1
Connect –DC to the second screw terminal.2
Green Gray
+24V DC
-DC
+485
-485
GND
(black wire)
(red wire)
Connecting Power Directly to the T-busFigure 2.8 –
Note
Green T-bus connectors provide power and communication connectivity
on the DIN rail backplane; gray T-bus connectors only provide power
connectivity and are used to distribute power without connecting
communication.
In the Main Trafc Cabinet
If DC voltage is sent across a homerun connection, AC power conversion is
provided in the main cabinet. In the main cabinet, the DC wires out of the Click!
201/202 should be wired to the PROTECTED side and the homerun cable should
be connected to the UNPROTECTED side of the Click! 200.
Note
The purpose of the Click! 200 in the main cabinet is not to protect the
sensor, but the electrical equipment inside of the main cabinet.
The last screw terminal block on the PROTECTED side of the Click! 200 module
contains a +DC, -DC and two surge ground connections (see Figure 2.9).
Connect +DC (usually a red wire) to the +DC screw terminal. 1
Connect -DC (usually a black wire) to the GND screw terminal next to the 2
+DC terminal.