FEU16x0 Field Equipment Controller Installation Instructions
6
Supply Power Terminal Block
The 24 VAC supply power terminal block is a gray, removable, 3-terminal plug that fits into a board-mounted jack
on the top right of the controller. Connect the 24 VAC supply power wires from the transformer to the HOT and
COM terminals on the plug as shown in
. The middle terminal on the supply power block is not used..
IMPORTANT:
The 24 VAC power should be connected to all network devices so transformer phasing is
uniform across the devices. Powering devices with uniform 24 VAC supply power phasing reduces noise,
interference, and ground loop problems. The FEC does not require an earth ground connection.
Figure 5: Pin Number Assignments for Sensor, SA Bus, and FC Bus Ports on FEC,
IOM, and VMA16
Power
(15 VDC)
SA or FC Bus +
SA or FC Bus
-
Bus and Power Common
Power
(15 VDC)
Sensor, SA Bus, or FC Bus Port
(RJ-12 Modular Jack)
Bus and Power Common
F
IG
:R
J_pi
n
out
2
3
4
5
6
1
Figure 6: 24 VAC Supply Power Terminal Block Wiring
FEC
Supply Power
Terminal Block
FEC
Supply Power
Terminal Block
Plug
Wires from
Johnson Controls
24 VAC, Class 2
Power Transformer
Brown Wire
(COM)
Orange Wire
(24 VAC)
FI
G
:FEC
_
Pw
er
_
P
rt
24V~
CO
M
HO
T
