Detcon 240 Manual de instrucciones descargar pdf (Pagina 9)

240 Operators Manual

Model 240 Operator Manual Rev. 1.8 Page 5 of 29

4.2.2 DC Power

For optional DC power input, connect 11.5-30VDC to the terminals at J8, labeled “DC IN” in

Figure 3 and

Figure 4. This input can be used for primary power or back-up power in the event of a VAC power failure.

115VAC/220VAC

External

VDC

Input

VDC ON/OFF

VIN

MOTHER BOARD POWER INPUT

External

VAC

Input

SW4

SW1

VAC ON/OFF

BATTERY

RESTORE

VSS

VIN

SW3

BATTERY

ON/OFF

SWOV

BATT2

BATT1

DC POWER

SUPPLY

FROM

VSS

VIN

SW2

PS1

PS2

Figure 3 Power Input Schematic

4.2.3 Analog 4-20 mA Sensor Inputs

Connect 4-20mA type gas sensors to the motherboard at the terminals labeled “CH 1” and “CH 2” (J15,

J16, respectively) in

Figure 4. These connections are labeled (+, -, mA). For a 3-wire gas sensor connect

to the “+”, “-”, and “mA” terminations. For a 2-wire sensor connect to the “+” and “mA” terminations,

refer to the Operators Manual for the gas sensor that is being connected.

Note: Analog sensor polling requires switch SW1-1 on the Control PCB to be set in the “OFF” position.

(See

Figure 5)

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