Detcon 12B - Manual (Page 12)

Model 12B
12B Control Module Instruction Manual Rev 1.4 Page 8 of 12
To program the load bypass circuit for either of the conditions described above: place a jumper tab on pins 2
and 3 (center and right) of the jumper location labeled JP-21. When the 12B control module is used in
conjunction with a Detcon TP or FP series sensor, and is being powered by the 12B control module, the
jumper tab should be placed on pins 1 and 2 (left and center) of the jumper location.
9.0 TEST FUNCTIONS
Model 12B control modules feature microprocessor supervised test functions that allow the user to verify
various control module settings and performance without having to remove the control module card from the
control enclosure. The test functions are activated by the alarm reset switch located on the control module face
plate and all applicable data is then displayed via the seven-segment LED displays and alarm LEDs.
There are three test features:
1) Display of alarm set points for alarm 1, alarm 2, and alarm 3
2) A simulation of applying a full scale gas sample that will take the display through an incremental
count up to the top of the range and back down, activating alarms at the programmed set points and
allowing verification of alarm outputs, as well as the over-range flashing feature.
3) Display of the RS-485 Modbus™ address setting.
Entering the test mode is performed by pressing and holding the alarm reset button for about 5 seconds. This
will cause the fault LED to illuminate, indicating that you have entered the test mode. After the fault LED
illuminates, you will have 5 seconds to select a test function. This is done by pressing and releasing the alarm
reset button. Pressing once will select test one. Pressing twice will select test two. Pressing three times will
select test three. If the button is not pressed within the 5 second time limit, the 12B control module will
automatically return to the normal operating mode.
NOTE: The fault LED will remain illuminated during testing. However, the fault relay will
not activate during testing unless there is a fault condition. An example of this would be the
disabling of alarms during testing via the alarm disable switch.
Below is a description of how to perform each test and what will occur during the test.
9.1 Alarm Set Point Test
To perform the alarm set point test, press and hold the alarm reset button for about five seconds until the fault
LED illuminates. Next, press and release the alarm reset button once. The alarm 1 LED will illuminate
indicating that this test has been selected. The test will begin automatically within five seconds.
The test will begin by displaying the alarm 1 set point with the alarm 1 LED illuminated. After about 3
seconds, the alarm 2 set point will be displayed and the alarm 2 LED will illuminate. After an additional 3
seconds, the alarm 3 set point will be displayed and the alarm 3 LED will illuminate. As the display cycles
through the three alarm set points, only the corresponding alarm LED will be illuminated, indicating which
alarm is being displayed. Alarm relays are not activated during this test. Normal operation resumes when the
cycle is complete.