Honeywell W7750A Manuale Utente
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—1
16
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 Topology
Transceiver (FTT) transformer-coupled communications port
running at 78 kilobits per second (kbps). Using the
transformer-coupled communications interface offers a much
higher degree of common-mode noise rejection while
ensuring dc isolation.
The W7750A,B,C Controller uses a Free Topology
Transceiver (FTT) transformer-coupled communications port
running at 78 kilobits per second (kbps). Using the
transformer-coupled communications interface offers a much
higher degree of common-mode noise rejection while
ensuring dc isolation.
Approved cable types for L
ON
W
ORKS
Bus communications
wiring 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
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
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.
Contact Echelon Corp. Technical Support for the
recommended vendors of Echelon approved cables.
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
J3
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)
(143)
3-1/16
(77)
2-1/8
(54)
6 (152)
M17490