WattMaster WCC III part 12 - Manual (Page 52)

WCC III Technical Guide 12-50
12. WCC III INSTALLATION
SAT 3C Controller - Connections points
All of the external SAT 3C connection points are single-tab ¼
inch Sta-Con connectors. With the exception of the TUC RS-
485 communications connection which is a three-position, de-
pluggable terminal block.
24VAC & GND Connection
Located on the bottom side of the SAT III controller is a 24 VAC
and GND connection. This is the main power connection to the SAT
3C controller. Each SAT 3C Controller draws - 10VA. The GND
connection points must be the same between all of the externally
powered TUC/RTU boards and the SAT 3C Controller.
SAT Communication Connection
These connection points are for wiring of the SAT RS-485
communication loop. There are two “T” (Transmit) connections,
two “R” (Receive) connections and two “SHIELD” connection
points. There are two connection points provided for each
connection for easy “daisy chaining” to the next Satellite Controller.
When connecting the RS-485 wiring from SAT III to SAT III or
SAT 3C/D/F, or SAT 3P controller the wiring connections are as
follows: connect “R” TO “R”, “T” TO “T”, AND “SHIELD” TO
“SHIELD” OR “SH”. The RS-485 wire specifi cations are plenum
rated jacketed stranded 18-gauge, 2-wire twisted pair with shield.
18-gauge stranded wire is mandatory to ensure a good connection
with the ¼-inch Sta-Con connectors which are used to terminate
the wires at the WCC III - MCD and at the satellite controllers.
TUC Communication Connection
These connection points are for wiring of the TUC RS-485
communication loop. There is a single three position, de-pluggable
terminal block. Connect the wiring for the communications
connections between the TUC/RTU’s as follows: “R” TO “R”,
“T” TO “T”, AND “SHLD” TO “SHLD” OR “SH”. Connect the
wiring from TUC/RTU controller to TUC/RTU controller. But, on
the SAT 3C/D/F controller the TUC “R” connection must be wired
to the SAT 3C/D/F “T” connection, and the SAT 3C/D/F controller
“R” connection must be wired to the TUC “T” connection. The
RS-485 wire specifi cations are plenum-rated jacketed stranded
18-gauge, 2-wire twisted pair with shield. 18-gauge stranded wire
is mandatory to ensure a good connection between TUC/RTU
controllers.
SAT 3C Controller