AD-1252 Thermal Dispersion Probe Airflow Measuring System Installation Instructions
10
Wiring Connections
Follow these steps to make wiring connections:
Note:
Do not over-tighten connections.
1.
Connect the 24 VAC power transformer of
appropriate rating to the DMPR-RA002 Electronic
Controller. See Figure 12.
a.
Connect 24 VAC hot to 24H + terminal.
b.
Connect 24 VAC common to 24C - terminal.
c.
Connect negative (-) terminal to earth ground.
2.
Connect 4 to 20 mA velocity and temperature
outputs from the electronic controller to a BAS
controller. See Figure 12. Wiring from the
4 to 20 mA outputs to the BAS should be shielded,
twisted pair cable of at least 22 AWG. Larger gauge
wire may be required for long runs. All wiring must
comply with applicable codes.
Note:
The controller is 4 to 20 mA sourcing,
not
loop
powered. See Table 6 for more information about probe
locations and sensor assignment numbers.
Finishing the Installation
1.
Connect a shielded CAT5e cable between the
RJ45 connector on each probe (Figure 7) to an
RJ45 connector on the electronic controller
(Figure 13). Make sure that the metal shielded
cable end is connected to the controller.
2.
Move the electronic controller’s power switch
(Figure 12)
to the ON position.
3.
Use the LCD Contrast Adjustment screw
(Figure 12) to adjust the LCD contrast as desired:
•
Turn the screw clockwise to increase contrast.
•
Turn the screw counterclockwise to decrease
contrast.
4.
Use the Options menu to configure the electronic
controller for your application. See
for specific instructions.
5.
After configuring the electronic controller, replace
the cover.
Figure 12: DMPR-RA002 Electronic Controller
Wiring Diagram
ON
OFF
24H
+
24C
-
FUSE
Velocity
4-20 mA
Temperature
4-20 mA
R18
R20
ESC
UP
DOWN ENTER
LCD Contrast Adjustment
PROBE CONNECTIONS
4
3
2
1
-
-
FI
G:
A
D
12
5
2
_
w
rn
g
J5
J6
Output only
connections
IMPORTANT:
Do not run the electronic controller
wiring in the same conduit as AC power wiring or
with wiring used to supply highly inductive loads,
such as motors, contactors, and relays. Fluctuating,
erratic, and inaccurate signal levels are possible
when AC power wiring is present in the same
conduit as the signal lines. Mount the controller and
run the wiring away from variable frequency drives
and broadcast antennas.
Figure 13: DMPR-RA002 Electronic Controller,
Bottom View
RJ-45 Connectors
FI
G
:A
D
1
252
_bt
tm
Green LED
Orange-Yellow LED
