Condec DLR334 Series - Manual (Page 11)

APPENDIX A - EXAMPLES
A-2
.
EXAMPLE 2 (Trip Band )
Require an alarm to be activated when the pressure falls out of an acceptance band of 25
PSI to 50 PSI. The trip points must be able to be entered from the front panel in the “run” mode.
Assume the base mode set for PSI. To eliminate output noise set the hysteresis for 0.1 PSI .
Require a front panel status display to indicate when the pressure is acceptable or high or low.
For failsafe it is required that the alarm will sound if the indicator losses power.
In the TRIP PT menu set the following:
TRIP POINT SELECT MENU
PARAMETER CHOICES
DESCRIPTION
TRIP ON Trip Option enabled
DISPLAY ACCEPT Applies to trip band 1 only.
RECALL MODIFY Can view and modify trip point status from front panel .
TRIP 1 ON Trip 1 is enabled.
TYPE BAND Trip Band mode. High and low trip entry.
TRIP 1 UNDER Sets polarity of trip band 1 output to be active when in
band .
TRIP1.H + 50.00 Trip band 1 upper value
TRIP1.L + 25.00 Trip band 1 lower value
HYST1.H DESCEND Hysteresis upper trip band 1 applies to descending data.
HYST1.H + 0.10 Hysteresis upper trip band 1 value .
HYST1.L ASCEND Hysteresis lower trip band 1 applies to ascending data.
HYST1.L + 0.10 Hysteresis lower trip band 1 value.
TRIP 2 OFF Trip 2 is disabled.
Connect output as follows:
RELAY OPTION BOARD
OUT 1 N.C.
TB3-1 ----------------- Alarm 1 --+V
OUT 1 COM TB3-3 ----------------- Ret
Results:
By using N.C. Connection the Alarm will sound if Indicator losses power.
When the pressure is between 25 and 50 PSI the display will say “ACCEPT” and the output
alarm will be inactive.
When the pressure is over 50 PSI, the display will prompt with “HIGH” and the output alarm
will be active. The alarm will be inactive when the pressure falls below 49.9 PSI.