Detcon FP-624C Manuel d'utilisateur télécharger pdf (Page 10)

d)Position gold plated jumper tabs located on the connector board in accordance with desired Form C dry

contact outputs: NO = Normally Open; NC = Normally closed (see figure 3).

Note

: If a voltage signal output is desired in place of the 4-20mA output, a 1/4 watt resistor must be installed

in position R1 of the terminal board. A 250Ω resistor will provide a 1-5V output (– to mA). A 100Ω resistor will

provide a .4-2V output, etc. This linear signal corresponds to 0-100% of scale (see figure 3).

e) Program the alarms via the gold plated jumper tab positions located on the CPU board (see figure 4). Alarm 1

and Alarm 2 have three jumper programmable functions: latching/non-latching relays, normally energized/nor-

mally de-energized relays, and ascending/descending alarm set points. The fault alarm has two jumper program-

mable functions: latching/non-latching relay, and normally energized/normally de-energized relay. The default

settings of the alarms (jumpers removed) are normally de-energized relays, non-latching relays, and alarm points

that activate during descending gas conditions.

If a jumper tab is installed in the latch position, that alarm relay will be in the latching mode. The latching

mode will latch the alarm after alarm conditions have cleared until the alarm reset function is activated. The non-

latching mode (jumper removed) will allow alarms to de-activate automatically once alarm conditions have cleared.

If a jumper tab is installed in the energize position, that alarm relay will be in the energized mode. The ener-

gized mode will energize or activate the alarm relay when there is no alarm condition and de-energize or de-acti-

vate the alarm relay when there is an alarm condition. The de-energized mode (jumper removed) will energize or

activate the alarm relay during an alarm condition and de-energize or de-activate the alarm relay when there is

no alarm condition.

If a jumper tab is installed in the ascending position, that alarm relay will be in the ascending mode. The

ascending mode will cause an alarm to fire when the gas concentration detected is greater than or equal to the

alarm set point. The descending mode (jumper removed) will cause an alarm to fire when the gas concentration

detected is lesser than or equal to the alarm set point. Except in special applications, combustible gas monitor-

ing will require alarms to fire in

“ASCENDING”

gas conditions.

Any unused jumper tabs should be stored on the connector board on the terminal strip labeled “Unused

Jumpers” (see figure 3).

Model FP-624C Combustible Gas Sensor PG.10

FAULT

ALARM 1

Latch

Energize

Latch

Ascending

Energize

ARM 2

CPU Board - Top View

Alarm Programming Jumpers

Control Circuit - Side View

CPU Board

Figure #4

LARM 1

WHT

BLK

YEL

BLU

DC Power In

NO/NC

COM

NO/NC

COM

NO/NC

COM

AULT ALM-2 ALM-1

larm Dry Contacts

LARM 2

AULT

-20 mA Output

S-485 In

S-485 Out

Optional Voltage

Developing Resistor

Use 250 ohm 1/4w

JUMPERS

UN-USED

umper Programmable Alarm Outputs

ormally Open or Normally Closed

Sensor

Place un-used alarm programming

umper tabs here

Figure #3

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 25 26

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Detcon FP-624C Manuel d'utilisateur Page 10

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