Filter
Top Products
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
g
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
g
round terminal. See Fi
g
. 37. for an
example. The resistor converts a 4 to 20 mA si
g
nal into a 2-to-
10V si
g
nal.
NOTE: Wire the 500 ohm resistor ph
y
sicall
y
as close as
possible to the driven device. If the resistor is located
far awa
y
from the driven device, it is possible that
noise will be added onto the 2-to-10V si
g
nal to
g
round line. This noise could cause an actuator to re-
position
(j
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
q
uired
for a sin
g
l
y
terminated L
ON
W
ORKS
Bus se
g
ment. Two
209541B Excel 10 FTT Termination Modules are re
q
uired for
a doubl
y
terminated dais
y
-chain L
ON
W
ORKS
Bus se
g
ment
(
see Fi
g
. 38
)
. Refer to L
ON
W
ORKS
Bus Wirin
g
Guidelines
form, 74-2865 for termination module placement rules.
For 209541B Excel 10 FTT Termination module placement
and wirin
g
options, see Fi
g
. 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