Defining the trip point, Defining hysteresis, Activating the restart inhibit – Rockwell Automation 937CU-AIHLP-DC1 HART Loop Converter Installation Instructions User Manual
Page 40: Defining the response delay
Bul. 937C HART Loop Converter Installation Instructions
Defining the Trip Point
1.
Enter the starting point as a floating point figure. For entering floating point figures, see
chapter 3.5.4. The defined unit from the
Unit menu is used as the
unit. See chapter 3.5.5.
2.
Confirm your entry with
OK.
Defining Hysteresis
Make sure during input that the hysteresis is at least 1 % greater than the trip point.
This avoids "fluttering" of the relay.
1.
Enter the hysteresis as a floating point figure. For entering floating point figures, see
chapter 3.5.4. The defined unit from the
Unit menu is used as the
unit. See chapter 3.5.5.
2.
Confirm your entry with
OK.
The restart inhibit is used to prevent momentary trip value violations from not being
noticed by operating personnel.
1.
Use the or buttons to select
On.
2.
Confirm your selection with
OK.
The relay status is retained after switching the relay.
3.
If you would like to reset the relay status, press the
ESC
or button or restart the device.
Inputting a response delay > 0 s prevents momentary trip value violations from triggering
an alarm.
1.
To change the time in steps, press the or buttons. Set the time from
0 s ... 250 s in increments of 5 seconds.
2.
Confirm your entry with
OK.
Activating the Restart Inhibit
The relay is reset. Exception: there is a trip value violation.
Defining the Response Delay
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