Installation Instructions Manual

Bul. 937C HART Loop Converter Installation Instructions
Defining the Tr
ip Point
1. Enter the starting point as a
floating point figure. For entering floating point figures, see
chap
ter 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 en
tering floating point figures, see
chap
ter 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. Confi
rm 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 re
start the device.
Inputting a response delay > 0 s prevents momentary trip value violations from triggering
an alarm.
1.
To change the time i
n 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 r
elay is reset. Exception: there is a trip value violation.
Defining the Response Delay
38