S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY
65-0321—01
12
Wiring
The S7999D Display must be appropriately wired for both
power and communications.
An external 24Vac power source must be supplied for the
S7999D OI.
The communication is done over two RS-485 bus ports:
• COM1 and COM2 are universal and can be configured to
provide:
— Fuel/Air Ratio Control commissioning and monitoring
— One or more boiler/burner systems monitoring (up to
99 burner/burner systems). Each burner control, Fuel/
Air Ratio Control, and Expanded Annunciator present
on each burner system can be viewed individually to
determine its status.
— Local display to a System Monitor
— System Monitor to one or more Local displays
— Gateway for ModBus Master (BAS)
Fig. 10. S7999D connector terminals.
*These 3 terminals are connected internally and can be con-
nected to earth ground
The S7999D communicates with the UDC controllers via a 3-
wire RS-485 interface using the Modbus™ protocol.
The System S7999D communicates with Local S7999Ds via a
3-wire RS-485 interface using the Modbus™ protocol.
The S7999D is compatible with R7999 build 140 and newer,
and with S7810M build 6020 and newer.
Fig. 11. S7999D basic wiring diagram
In this example, COM 1 is configured for commission fuel/Air
Ratio Control (the Baud rate must be set for 4800), and COM 2
is configured for one or more burner/burner systems
monitoring. The Baud rate must match the selected Baud rate
of the S7810M ModBus Module. For network wiring and setup
of the R7999, RM7800/S7810M, S7830 and UDC2500/3200/
3500 with the S7999D, refer to 65-0231.
Table 1. 8-pin Connector Terminals.
Pin #
Function
1
COM1 A
2
COM1 B
3
COM1 C*
4
COM2 A
5
COM2 B
6
COM2 C*
7
24 Vac Common *
8
24 Vac Power
M33566
A B C A B C COM POWER
COM 1
COM 2
24 VAC
M33554A
CONTROLINKS
CONTROLLER
R7999
A B C
A B C A B C COM POWER
S7999D OI DISPLAY
3
1
6
7
S7810M
MODBUS
MODULE
C A B
6 7 8
2
“C” TERMINALS ARE CONNECTED INTERNALLY TO 24 VAC “COM”.
3
SEE 65-0249 FOR MULTIPLE S7810M NETWORK CONNECTIONS.
4
MODBUS BAUD RATE SET FOR EITHER 9600 OR 19200.
RS485 WIRING: MAXIMUM 4,000 FEET WITHOUT RS485 REPEATERS.
THE S7810M MODBUS MODULE MUST BE CONNECTED TO A 7800 SERIES BURNER
CONTROL. (THE 7800 SERIES BURNER CONTROL GENERATES THE START BIT FOR
THE MODBUS POLLING OF THE MEMBERS ON THE LOCAL MODBUS NETWORK).
5
SEE 65-0238 FOR R7999 WIRING.
6
120
Ω
, 1/4 WATT RESISTOR BETWEEN TERMINALS A AND B OF THE MODBUS AT
THE FARTHEST S7810M MAY BE NECESSARY FOR LONG RS-485 RUNS.
7
4
10
5
CONNECT SHIELD TO EARTH GROUND.
1
SEE 65-0249 FOR CONTROL BUS (LOCAL RS-485 COMMUNICATION BUS) WIRING.
2
1
COM 1
COM 2
24 VAC
3
8
TO PROTECT AGAINST CONDUCTED AND RADIATED TRANSIENT NOISE, USE
CLAMP FILTERS (INCLUDED IN 50063482-001 BAG ASSEMBLY) AS ILLUSTRATED
IN FIGURES 2 AND 3.
8
9
10
9
9
120V
Summary of Contents for S7999D1048
Page 70: ...S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY 65 0321 01 70 ...
Page 72: ...S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY 65 0321 01 72 ...
Page 74: ...S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY 65 0321 01 74 ...
Page 75: ...S7999D1048 COMBUSTION SYSTEM OPERATOR INTERFACE DISPLAY 75 65 0321 01 ...
