Model 755A

Instruction Manual

245364-V May 2002

b.Selection of Deadband

The desired deadband may be selected with the appropriate trimming potentiometer:

ALARM 1 = R73

ALARM 2 = R78

For any setpoint, deadband is adjustable from 1% of fullscale (counterclockwise limit) to 20% of fullscale (clockwise limit). Deadband is essentially symmetrical with respect to setpoint.

2. CR1 AND CR2 ARE ANY 600V, 1A DIODE.

1. RELAYS SHOWN IN ENERGIZED POSITION.

NOTES:

J5

CR1

+15V

1

 

 

14

13

-15V

2

K1

ALARM 1

4

 

COMMAND

 

 

CR2

1413

K2

ALARM 2

6

COMMAND

 

 

NO

1

9

5

COM

NC

 

ALARM 1

12 8

RESET

 

NO

1

9

5

COM

NC

 

 

ALARM 2

12

8

 

RESET

Figure 3-4. Schematic Circuit of Alarm Relay Assembly

Rosemount Analytical Inc. A Division of Emerson Process Management

Operation 3-13