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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—116
Fig. 7. W7750B,C construction in in. (mm). W7750C (shown) has three 4 to 20 mA analog outputs.)
Communications:
The W7750A,B,C Controller uses a Free Topolo
gy
Transceiver
(
FTT
)
transformer-coupled communications port
runnin
g
at 78 kilobits per second
(
kbps
)
. Usin
g
the
transformer-coupled communications interface offers a much
hi
g
her de
g
ree of common-mode noise re
j
ection while
ensurin
g
dc isolation.
Approved cable t
y
pes for L
ON
W
ORKS
Bus communications
wirin
g
is Level IV 22 AWG
(
0.34 mm
2
)
plenum or nonplenum
rated unshielded, twisted pair, solid conductor wire. For
nonplenum areas, use Level IV 22 AWG
(
0.34 mm
2
)
such as
U.S. part AK3781
(
one pair
)
or U.S. part AK3782
(
two pair
)
. In
plenum areas, use plenum-rated Level IV, 22 AWG
(
0.34
mm
2
)
such as U.S. part AK3791
(
one pair
)
or U.S. part
AK3792
(
two pair
)
.
(
See Tables 9 and 11 for part numbers.
)
Contact Echelon Corp. Technical Support for the
recommended vendors of Echelon approved cables.
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E
GND
LED
BYPASS
SNSR
AI
GND
AI
GND
AI
GND
SET PT
AI-1
OHM
AI-2
OHM
AI-3
V/mA
AI-4
V/mA
20VDC
OUT
L
ON
W
ORKS
BUS
L
ON
JACK
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
DI-4
DI
GND
DI-3 DI-2
DI
GND
DI-1
VAC
24
VAC
24
COM
1
OUT
2
OUT
3
OUT
4
OUT
5
OUT
A0
1
A0
2
A0
3
5-3/16 (132)
5-5/8
(143)
3-1/16
(77)
2-1/8
(54)
6 (152)
M17490