H2fl ow Controls
ProcessDefender™
37
Programming
H2fl ow Controls
ProcessDefender™
36
Programming
⊲
Menus 3.2.1 and 3.2.2 - Main Alarm Relay (R1) Overload and Underload
Trip response times
The screen will now show either 3.2.1 or 3.2.2 (depending on what was set in 3.1.1).
These menus relate to the
response delays
for either the process overload (3.2.1)
or process underload (3.3.2) condition. The response delay is the time-period that
the PD100 will take to respond once the load has exceeded the alarm levels that have
been set. For an application such as a conveyor, and where a fast response is required
to protect against damage caused by a blockage, then the response should be set to a
short duration. For a Mag Drive pump, the response delay may be better set to several
seconds, in-order-to avoid nuisance alarms caused by short process disruptions as
opposed to a run-dry situation.
Fig.5.0
To make changes to 3.2.1 and 3.2.2, press
the
or
button. Now press the
or
buttons to adjust the underlined
number and then press the
button to
move to the next digit and press
again
to accept the complete entry.
The screen will now show 3.3.1.
⊲
Menu 3.3.1 - Main Alarm Relay (R1) Latch
This menu relates to the
Main Alarm Relay Latch
. The factory default for the latch
is ‘ON’, which means that an alarm will cause the Main Alarm Relay (R1), to remain in
its tripped state until a reset action is performed.
To change the Latch to ‘OFF’, fi rst press the
or
button. Now press the
or
buttons to change from ‘ON’ to ‘OFF’ and press the
button to accept the
change.
The screen will now show 3.3.2.
⊲
Menu 3.3.2 - Main Alarm Relay (R1) Hysteresis
This menu relates to the
Relay Hysteresis %
for the main alarm relay and is only
applicable if the Relay Latch has been set to ‘OFF’ in menu 3.3.1.
Applying Hysteresis % to an unlatched relay prevents ‘relay chatter / bounce’ 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 %.
To make changes to 3.3.2, 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 3.3.3.
Fig.5.1
