Honeywell SV2 Series Installation Instructions Manual page 6

Fig. 8. HMITOOL-000 wiring diagram.
A
1
4
2 7 8
SV2 SERIES VALVE
RS-485
MODBUS
+
–
C
MODBUS
OFF ON
BIAS 1
TERMIN. 2
BIAS 3
6
1 HMI COM PORTS ARE NOT RESTRICTED TO A SPECIFIC DEVICE, BUT CAN
BE CONNECTED TO A SV2 VALVE(S) OR A BUILDING AUTOMATION SYTEM.
2 CONNECT SHIELD TO EARTH GROUND ON ONE END ONLY.
3 SIZE 24VAC TRANSFORMER ACCORDING TO LOAD REQUIREMENT.
4 TO PROTECT AGAINST CONDUCTED AND RADIATED TRANSIENT NOISE,
USE CLAMP FILTERS (INCLUDED IN 50063482-001 BAG ASSEMBLY) AS
ILLUSTRATED IN FIGURES 1 AND 2.
5 "C" TERMINALS ARE CONNECTED INTERNALLY TO 24VAC "COM".
6 SET VALUE MODBUS BIAS RESISTOR PER THE 'VALVE MODBUS BIAS
SETUP' SECTION OF THIS DOCUMENT.
7
FOR THE BEST PERFORMANCE, USE SHIELDED WIRE WITH TWO
TWISTED PAIRS (BELDEN 9842 OR EQUIVALENT). CONNECT + AND - TO
ONE TWISTED PAIR, AND C TO BOTH WIRES OF THE OTHER TWISTED
PAIR. CONNECT THE SHIELD TO EARTH GROUND AT THE END OF THE
CONNECTED EXTERNAL DEVICE. DO NOT CONNECT C TO THE SHIELD.
8
RUN LOW VOLTAGE AND LINE VOLTAGE WIRES IN SEPARATE CONDUIT.
ROUTE ANY NOISE PRODUCING WIRES IN CONDUIT SEPARATE FROM
THE DISPLAY AND AS FAR AWAY FROM THE DISPLAY AS POSSIBLE.
HMITOOL-000 DISPLAY
1
COM1 COM2
B C A B C
2 3 4 5 6
6
5
7 8
24VAC
24VAC RETURN
3
BUILDING
AUTOMATION
SYSTEM
M35511A
32-00030EFSP—05