EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
43 74-2958—1
Fig. 36. Pneumatic transducer to W7750B,C
(B shown, see triangle note 4).
To use the analo
outputs on the W7750C with 2-to-10V
actuators or transducers, a 500 ohm
1 percent or better
tolerance
resistor must be placed across the 2-to-10V
devices input and
round terminal. See Fi
. 37. for an
example. The resistor converts a 4 to 20 mA si
nal into a 2-to-
10V si
nal.
NOTE: Wire the 500 ohm resistor ph
sicall
as close as
possible to the driven device. If the resistor is located
far awa
from the driven device, it is possible that
noise will be added onto the 2-to-10V si
nal to
round line. This noise could cause an actuator to re-
position
itter
and reduce the actuators life.
Fig. 37. RP7517,B pneumatic transducer to W7750C.
L
ON
W
ORKS
®
Bus Termination Module
One 209541B Excel 10 FTT Termination Module is re
uired
for a sin
l
terminated L
ON
W
ORKS
Bus se
ment. Two
209541B Excel 10 FTT Termination Modules are re
uired for
a doubl
terminated dais
-chain L
ON
W
ORKS
Bus se
ment
see Fi
. 38
. Refer to L
ON
W
ORKS
Bus Wirin
Guidelines
form, 74-2865 for termination module placement rules.
For 209541B Excel 10 FTT Termination module placement
and wirin
options, see Fi
. 39.
24 VAC
24 (H)
24 (N)
24 (H)
24 (N)
INCREASE
DECREASE
24 VAC
W7750B,C CONSTANT
VOLUME AHU
CONTROLLER
MMC325 PNEUMATIC
TRANSDUCER
1
2
3
4
4
MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN;
REVERSING TERMINATIONS RESULTS IN EQUIPMENT
MALFUNCTION.
OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.
USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE
MUST BE 6 FT. (1.8M) OR LONGER.
TERMINALS 16,17, 18 ARE ANALOG OUTPUTS (W7750C ONLY).
31 30 29 28 27 26 25 24 23 22 21 20
24 VAC COM
19 18 17 16
+
-
3
2
1
OUT 7
OUT 6
OUT 5
OUT 4
OUT 8
OUT 1
OUT 3
OUT 2
DI-2
DI-4
DI-1
DI-3
DI
GROUND
DI
GROUND
PNEUMATIC
VALVE
M10078C
M
B
M
24 VAC
24 VAC
W7750C CONSTANT
VOLUME AHU
CONTROLLER
RP7517B PNEUMATIC TRANSDUCER
1
2
3
3
ANALOG OUTPUTS FROM W7750C ARE 4 TO 20 mA SIGNALS. A 500 OHM
1% TOLERANCE (OR BETTER) PRECISION RESISTOR IS REQUIRED TO
DRIVE THIS (RP7517B) AND OTHER 2 TO 10V DEVICES. PLACE THIS
RESISTOR AS CLOSE AS POSSIBLE TO THE DRIVEN DEVICE.
USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE
MUST BE 6 FT. (1.8M) OR LONGER.
TERMINALS 16 TO 18 ARE ANALOG OUTPUTS (W7750C ONLY).
31 30 29 28 27 26 25 24 23 22 21 20
24 VAC COM
19 18 17 16
+
-
2
1
AO 2
AO 1
BLACK
BLUE
BROWN
OUT 5
OUT 4
AO 3
OUT 1
OUT 3
OUT 2
DI-2
DI-4
DI-1
DI-3
PNEUMATIC
VALVE
ACTUATOR
500
M17368
RP7517B
1
M
2
B
M
DI
GROUND
DI
GROUND
