Detcon 110A-FB - Manual (Page 4)

1.2 P ROGRAMMING THE 110A-FB
The 110A-FB controller board has several functions that may be changed or activated by the user. These
include alarm set points, alarm firing direction (descending or ascending), latching alarms, alarm disable
and other functions that will be fully discussed below.
1.3 A LARM L EVEL P ROGRAMMING
The Low and High alarm levels are adjustable in single digit increments from 1 to 99% of scale. To pro-
gram, refer to SW1, SW2, SW3 and SW4 (see figure #1). SW1 corresponds to the most significant digit (10's)
on the high alarm. SW2 corresponds to the least significant digit (1's) on the High alarm. SW3 corresponds
to the Most Significant Digit (10's) on the Low alarm. SW4 corresponds to the Least Significant Digit (1's)
on the Low alarm.
While using a jeweler's screwdriver, program the corresponding switches to the desired set point. For
example, if the Low alarm set point is 10 ppm/%, set SW3 to 1 and SW4 to 0. If the High alarm set point is
25, set SW1 to 2 and SW2 to 5.
1.4 L ATCHING/ N ON- L ATCHING A LARMS
The Low and High alarm relays may be programmed for latching or non-latching operation. To program,
refer to JP4 - Low; and JP1 - High (see figure #1). To program for non-latching operation, place the jumper
tab on the upper 2 pins of the connector. To program for latching operation, place the jumper tab on the
lower 2 pins of the connector.
1.5 A LARM F IRING D IRECTION
The Low and High alarms may be programmed to fire during ascending gas conditions or descending gas
conditions (as in oxygen deficiency monitoring). To program, refer to JP3 - Low; and JP2 - High (see figure
#1). To program for an alarm to fire in ascending gas conditions, place the jumper tab on the upper 2 pins
of the connector (>). To program for an alarm to fire in descending gas conditions, place the jumper tab on
the lower 2 pins of the connector (<).
1.6 A LARM C ONTACTS
Contacts are provided for 3 alarms; High, Low and Fault and are rated 8 amp @ 117 VAC/5 amp @ 30
VDC. Alarm contacts are Form C dry contacts; common, normally open and normally closed. A 5 amp
micro-fuse is provided in series with the common relay contact for each alarm (see figures #1 and #2).
1.7 A LARM R ESET
The alarm reset switch located on the 110A-FB motherboard is a normally open momentary switch. The
reset function is effective when the Low and/or High alarms have been programmed in the latching posi-
tion and alarm conditions have passed (see figures #1 and #2).
1.8 R EMOTE R ESET
A remote mounted normally open momentary switch may be used to reset the Model 110A-FB controller.
The reset function is effective when the alarms have been programmed in the latching position and alarm
conditions have passed (see figures #1 and #2).
1.9 A LARM D ISABLE
An alarm disable switch located on the motherboard will deactivate the Low and High alarm relays. An
LED indicator located next to the switch will light when in the disable mode (see figures #1 and #2).
CAUTION: The alarm disable function is a completely manual operation and care must be used to remem-
ber to put the switch back in the “ABLE” position after maintenance is completed.
1.10 P OWER R EQUIREMENTS
Model 110A-FB contains an internally mounted 24 VDC power supply that operates on 117 VAC.
Terminations are also provided on the motherboard for auxiliary DC input 20-28 VDC. A 1/2 amp 3AG
Detcon Model 110A-FB Gas Detection System PG.4