Instruction Manual
Section 9: Alarm Relay Functions
LIQ-MAN-56
April 2017
Alarm Relay Functions
71
5.
Setpoint:
Enter the desired setpoints value. This will activate an alarm event when the
process measurement reaches the entered setpoint value. Press ENTER/MENU. See Table
9-3 for entry limits.
6. Select
NEXT
Press ENTER/MENU to advance to the next setup screen.
7.
Deadband:
To set deadband as a measurement value, enter the change in the process
value needed after the relay deactivates to return to normal (and thereby preventing re-
peated alarm activation). Press ENTER/MENU.
8.
Normal state:
Set the normal alarm condition as Open or Closed and press
ENTER/MENU. Program the normal state to define the desired alarm default state to nor-
mally open or normally closed upon power up.
9. Select
NEXT
Press ENTER/MENU to advance to the next setup screen: Configure feed
relay.
10.
Feed relay:
Assign relay 2, 3, or 4 as a feed relay and press ENTER/MENU.
11.
Linked to bleed relay:
No entry required. The relay originally programmed as the Bleed
relay is displayed.
12.
Delay time:
Enter the time in minutes (X.X min) after the Bleed time is activated before
triggering this feed relay.
13.
Feed time equals:
Enter the percent of time that the Bleed timer is on (X.X%) to activate
this feed relay (for pumping make-up water chemicals).
* See Appendix 1 – HART and Device Variables
9.5
Totalizer Based Relay Activation
9.5.1
Description:
A totalizer based timer feeds chemicals for a preset period every time a programmed volume
of liquid has been added to or removed from a vessel. The relay energizes when the volume
has been reached and remains energized for a fixed time. The process repeats once the
volume has been reached again.
Totalizer Based Relay Activation triggers a relay at user-defined intervals based on
accumulated totalized flow. The scheme uses pulse inputs from a flow meter or 4-20mA
current input(s) from a flow transmitter to calculate total flow (as volume).
Relay Function
Limits and Selections
Default
Bleed and Feed
NA
NA
Logic
Low/High
High
Setpoint
*
*
Deadband
*
0.000
Normal state
Close/Open
Open
Feed relay
1, 2, 3, 4
not assigned
Linked to bleed relay
1, 2, 3, 4
1
Delay time
0 - 999.9 min
1.0 min
Feed time equals
0 - 999.9% of bleed time
10.0% of bleed time
Normal state
Close/Open
Open
Summary of Contents for Rosemount 56
Page 1: ...Instruction Manual LIQ MAN 56 Rev D April 2017 Rosemount 56 Advanced Dual Input Analyzer ...
Page 2: ......
Page 10: ...iv Table of Contents Instruction Manual April 2017 LIQ MAN 56 ...
Page 30: ...Section 2 Installation Instruction Manual April 2017 LIQ MAN 56 20 Installation ...
Page 40: ...30 Wiring Section 3 Wiring Instruction Manual April 2017 LIQ MAN 56 ...
Page 64: ...Section 6 Programming Measurements Instruction Manual April 2017 LIQ MAN 56 54 ...
Page 76: ...Section 8 Time Proportional Control Instruction Manual April 2017 LIQ MAN 56 66 ...
Page 124: ...Section 13 Maintenance Instruction Manual April 2017 LIQ MAN 56 114 ...
Page 126: ...Section 14 Return of Material Instruction Manual April 2017 LIQ MAN 56 116 ...
