Honeywell W7750A specifications Lonworks Bus Termination Module

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

MMC325 PNEUMATIC

TRANSDUCER

M

M

24 (H)

24 (N)

24 (H)

24 (N)

INCREASE

DECREASE

3

B

1

2

PNEUMATIC

VALVE

+

24-VAC

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

DI-4

DI GROUND

DI-3

DI-2

DI GROUND

DI-1

24 VAC

VAC COM

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

24

W7750B,C CONSTANT

4

VOLUME AHU

CONTROLLER

1MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN; REVERSING TERMINATIONS RESULTS IN EQUIPMENT MALFUNCTION.

2OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.

3USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE MUST BE 6 FT. (1.8M) OR LONGER.

4TERMINALS 16,17, 18 ARE ANALOG OUTPUTS (W7750C ONLY).

M10078C

Fig. 36. Pneumatic transducer to W7750B,C

(B shown, see triangle note 4).

To use the analog outputs on the W7750C with 2-to-10V actuators or transducers, a 500 ohm (1 percent or better tolerance) resistor must be placed across the 2-to-10V devices input and ground terminal. See Fig. 37. for an example. The resistor converts a 4 to 20 mA signal into a 2-to- 10V signal.

NOTE: Wire the 500 ohm resistor physically as close as possible to the driven device. If the resistor is located far away from the driven device, it is possible that noise will be added onto the 2-to-10V signal to ground line. This noise could cause an actuator to re- position (jitter) and reduce the actuators life.

RP7517B PNEUMATIC TRANSDUCER

									2 B				PNEUMATIC
												2	VALVE
													ACTUATOR
								RP7517B
									1 M
									500
							BROWN		1		M
								BLACK		BLUE
															24 VAC
															+
															-
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
DI-4	DI GROUND	DI-3	DI-2	DI GROUND	DI-1	24 VAC	VAC COM	OUT 1	OUT 2	OUT 3	OUT 4	OUT 5	AO 1	AO 2	AO 3
							24
				W7750C CONSTANT										3
				VOLUME AHU
				CONTROLLER

1ANALOG OUTPUTS FROM W7750C ARE 4 TO 20 mA SIGNALS. A 500 OHM 1% TOLERANCE (OR BETTER) PRECISION RESISTOR IS REQUIRED TO DRIVE THIS (RP7517B) AND OTHER 2 TO 10V DEVICES. PLACE THIS RESISTOR AS CLOSE AS POSSIBLE TO THE DRIVEN DEVICE.

2USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE MUST BE 6 FT. (1.8M) OR LONGER.

3TERMINALS 16 TO 18 ARE ANALOG OUTPUTS (W7750C ONLY). M17368

Fig. 37. RP7517,B pneumatic transducer to W7750C.

LONWORKS® Bus Termination Module

One 209541B Excel 10 FTT Termination Module is required for a singly terminated LONWORKS Bus segment. Two 209541B Excel 10 FTT Termination Modules are required for

adoubly terminated daisy-chain LONWORKS Bus segment (see Fig. 38). Refer to LONWORKS Bus Wiring Guidelines form, 74-2865 for termination module placement rules.

For 209541B Excel 10 FTT Termination module placement and wiring options, see Fig. 39.

43 74-2958— 1