H2fl ow Controls
ProcessDefender™
47
Programming
H2fl ow Controls
ProcessDefender™
46
Programming
⊲
Menu 4.3.2 - Pre-Alarm Relay (R2) Hysteresis
This menu relates to the
Relay Hysteresis %
for the pre-alarm relay and is only
applicable if the Relay Latch has been set to ‘OFF’ in Menu 4.3.1.
Applying Hysteresis % to an unlatched relay prevents ‘relay chatter’ if the load is close
to the alarm level and goes in and out of that level. To reduce unacceptable relay
chatter / bounce, increase the Hysteresis %.
Fig.6.4
To make changes to 4.3.1, press the
button. Using the
and
buttons,
adjust the underlined number and then press the
button to accept the required
value and move to the next digit. Repeat until all digits are programmed and then press
the
button to accept the complete entry.
The screen will now show 4.3.3.
⊲
Menu 4.3.3 - Pre-Alarm Relay (R2) operating status
This menu relates to the
Pre-Alarm Relay Status.
The factory default for the status
is ‘NO’ (Normally Open), which means that the R2 contacts will close when an alarm
/ trip occurs.
Fig.6.5
To change the status to ‘NC’ (Normally
Closed), fi rst press the
or
button.
Now press the
or
buttons to
change from ‘NC’ to ‘NO’ and press the
button to accept the change.
The screen will now show 4.0.0. Press the
button to go to 5.0.0 (General Alarm
Relay R3).
Summary of Relay 1 and Relay 2 Alarms
Fig.6.6
