Detcon 10B User Manual

Page 6

is to have the fault relay normally energized so that in the event of a power failure to the control module card, the fault

relay will de-energize causing its relay contacts to change state, thereby creating a fault output.

It must be noted that when an alarm relay is jumper programmed as normally energized, the contact outputs, normally

open and normally closed, become reversed. The normally open contact becomes the normally closed and vice versa.

Reconf iguration of the contact output jumpers may be required.

To program an alarm for normally energized operation, slide its corresponding switch to the “on” position. For normal-

ly de-energized operation slide the switch to the “off” position. The switch locations are as follows: fault – SW2-1, alarm

1 - SW2-7, and alarm 2 – SW2-4.

2..3

3..3

3 A

Assc

diin

g o

orr D

essc

diin

g A

Alla

arrm

mss

Alarm 1 and alarm 2 can be switch programmed to operate during ascending or descending gas conditions. This feature

is useful mainly for the monitoring of oxygen def iciency whereas a decrease in oxygen concentration poses a danger to

personnel. However, there may be other applications where the monitoring of a specif ic gas concentration is desired and

alarms can be programmed to operate when that concentration exceeds or drops below a predetermined range. Typically,

most applications of monitoring for toxic or combustible gases will warrant that the alarm be programmed as ascending.

To program an alarm for ascending gas conditions, slide its corresponding switch to the “on” position. For descending gas

conditions slide the switch to the “off” position. The switch locations are as follows: alarm 1 - SW2-6, and alarm 2 – SW2-3.

2..3

3..4

4 D

Diissp

plla

y C

nffiig

urra

attiio

The controller uses standard seven-segment displays and comes from the factory pre-conf igured for a particular range of

detection. The two digit version is standard. A three digit version is also available and is standard for oxygen. A switch is

used to program the controller for 2 or 3 digit operation. Additional switches are used to turn on the individual deci-

mal places on the displays. These features are preconf igured at the factory and should not require further adjustment.

SW3-1 selects between a 2 digit or 3 digit display. SW3-3 will turn the decimal point either on or off, and SW3-2 sets

the location of the decimal point.

2..3

3..5

5 D

ette

ctto

orr P

err S

nsse

e S

wiittc

This switch should be left in the “ON” position at all times.

2..3

3..6

6 A

Alla

arrm

m 2

2 S

Siille

Alarm 2 can be switch programmed to allow it to be reset in the event of an alarm, even if the alarm condition still

exists. This feature would be mainly used if there were a strobe light activated by Alarm 1 and a horn Activated by

Alarm 2. In the event of an alarm both the horn and strobe would be engaged but the horn could be silenced and

would remain silenced until the alarm condition went away and a new alarm occurred. To program Alarm 2 for the

silence feature turn the switch “on”. For normal operation of Alarm 2 turn the switch off. This switch is located at

SW3-5.

2..3

3..7

7 A

Alla

arrm

m R

esse

ett

An alarm reset switch (SW1), located on the control module face plate is used to reset alarms that have been pro-

grammed as latching. Once alarm conditions have cleared, alarms may be reset by simply pushing the momentary

switch and releasing it.

Remote reset outputs are also a feature of the Model 10 control module. This feature is available when used in conjunc-

tion with Model 10 compatible control enclosures and mainframe motherboards.

2.4 C

ONTROLLER

PERATION AND

ENU

ELECTIONS

Upon applying power, the display will show dC for approximately 2 seconds. The controller will then enter normal oper-

ation mode, displaying the gas concentration. There is a 15 second period after power-up in which alarms are ignored.

2..4

4..1

1 S

elle

cttiin

g a

d A

djju

ussttiin

g M

u S

elle

cttiio

nss

Besides acting as an alarm reset, the front panel switch is used to access and navigate through the programming menu

system. The Switch functions as both an Enter Key, and as a Selection Key. When it is pressed and held for more than 2

seconds it will act as an Enter Key. When it is momentarily pressed it acts as a Select Key.

Model 10 Single Channel Digital Control Module PG.6