AMX Sensors and Receivers IR Guía para resolver problemas descargar pdf (Pagina 5)

Application Advisory

AA-3(IR TS)

3.

Long Wire Runs – shielded wire typically of

100 feet (30 meters) or longer causes a filter

effect due to accumulated capacitance of the

wire. Intermittent, or no IR control, could

actually be because of the longer wire runs.

Putting a 470-ohm resistor in parallel at

the connecting block between signal and

ground will effectively discharge the

capacitance of the wire. This will allow

the signal to travel farther on shielded

wire. Adding a resistor between the

input and ground of the connecting block

will drop the IR level down somewhat.

Passive connecting blocks, such as the

789-44, may not have enough signal

output for consistent control of the

equipment. You may have to upgrade to

an amplified connecting block to bring

the IR level back to normal. In these

cases, the 791-44 would be an ideal

connecting block for single zone

systems while the 795-20 would work

best for a 2-4 zone system.

Symptom 6:

Emitters function but some (or all) components do not respond.

Cause: Solution

1.

Emitter placement is incorrect.

Reposition the Emitter so that it is

directly over the components sensor

window. Consult the components

owners manual of the unit for the exact

location of the IR Sensor Window.

2.

Emitter placement is correct but the signal is

overpowering the unit or there is bleed-

through from other emitters close by.

Reposition the Emitter to a position that

is suitable for the unit. Use a 283 or

286M Blink style emitter (they have a

lower output than non-blink emitters 282

and 284M). If the components do not

need to be controlled directly without an

IR Repeater system (components are

located in an equipment closet), place a

Mouse Emitter Shield cover over the

Emitter (PN#MS1). The rounded (non-

stick) side of the emitter is a hi-output

side and can reflect off other devices

and overpower some components IR

Sensors. If using a CB12 connecting

block, try a 789-44 connecting block.

This has a series resistor at the output,

which will limit current to the Emitter.

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