Honeywell T775U - Manual (Page 6)

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0255—07 6
Fig. 5. Sensor Wiring — 3-wire shielded cable
connection from Sensor A to 0-10 Vdc sensor
(H76xx humidity sensor shown).
Fig. 6. Sensor Wiring — 2-wire shielded cable
connection from 4-20 mA sensor to
T775 controller (loop powered wiring).
Fig. 7. Sensor Wiring — 2-wire shielded cable
connection from Sensor A to a 0-10 Vdc sensor
using separate transformer.
Fig. 8. Sensor Wiring — 2-wire 4-20mA sensor input
to T775 controller using a separate (Vdc only)
transformer.
M24550
THE T775U WILL ONLY ACCEPT 0-10 VDC AND 4-20 MA SENSORS.
IF REPLACING AN H775 CONTROLLER THAT USES A C7600B OR OTHER
2-10 VDC SENSOR, THE SENSOR MUST BE REPLACED. REPLACE THE
C7600B2008 SENSOR (2-10VDC OUTPUT) WITH THE H7655A1001
(0-10 VDC OUTPUT) SENSOR. THE H7655A1001 SENSOR USES THE SAME
ENCLOSURE STYLING AND WIRING AS THE C7600B.
1
NOTES:
1. SHIELDED CABLE MUST BE
CONNECTED TO A SEPARATE
EARTH GROUND. HOWEVER,
DO NOT GROUND SHIELDED
CABLE AT SENSOR END.
2. TO MINIMIZE NOISE PICKUP,
MAKE SENSOR CONNECTION
FROM SHIELDED CABLE AS
CLOSE AS POSSIBLE TO
SENSOR BODY.
EXAMPLE OF
H76XX HUMIDITY
SENSOR;
0-10 VDC
CONNECTION
SENSOR A
1
SENSOR B
C
S
V
T
T
VO GND VIN
C S V
SHIELDED CABLE
M24890C
V S
SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND.
DO NOT GROUND SHIELDED CABLE AT SENSOR END.
TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED
CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.
THE T775 HAS AN INTEGRAL LOAD OF 500 OHMS WHICH RESULTS IN A
10V DROP AT 20MA. TO USE 4-20MA LOOP POWERED WIRING, THE SENSOR
MUST BE CAPABLE OF OPERATION WITH 8V OR LESS ACROSS ITS TERMINAL.
SENSOR A
SENSOR B T
T
SHIELDED CABLE
PWR OUT COM
C
S
V
1
2
3
1
2
3
M24551
S
C
NOTES:
1. SHIELDED CABLE MUST BE
CONNECTED TO A SEPARATE
EARTH GROUND. HOWEVER,
DO NOT GROUND SHIELDED
CABLE AT SENSOR END.
2. TO MINIMIZE NOISE PICKUP,
MAKE SENSOR CONNECTION
FROM SHIELDED CABLE AS
CLOSE AS POSSIBLE TO
SENSOR BODY.
EXAMPLE OF
P7640A
PRESSURE
SENSOR;
0-10 VDC
CONNECTION
SENSOR A
SENSOR B T
T
SHIELDED CABLE
PWR OUT COM
C
S
V
L1
(HOT)
L2
24 VAC
M24889A
S
C
NOTES:
1. SHIELDED CABLE MUST BE
CONNECTED TO A SEPARATE
EARTH GROUND. HOWEVER,
DO NOT GROUND SHIELDED
CABLE AT SENSOR END.
2. TO MINIMIZE NOISE PICKUP,
MAKE SENSOR CONNECTION
FROM SHIELDED CABLE AS
CLOSE AS POSSIBLE TO
SENSOR BODY.
EXAMPLE OF P7640A 4-20 MA SENSOR CONNECTION
SENSOR A
SENSOR B
T
T
SHIELDED CABLE
C
S
V
PWR ZERO COM OUT
+
–
12-30 VDC
POWER SUPPLY