Atkinson Dynamics AD-28LD-MV Handleiding voor installatie- en service-instructies - Pagina 5

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REMOTE CONTROL:

Remote control is used to change the operation mode of a remote

intercom from listen to talk or from talk to listen upon activation of

a local intercom. The wiring diagram section illustrates Master/Slave

Installation and Using Foot Switches Diagrams. (See figures 5 and 6.)

Normally open foot switches can also be connected to the Remote

Control line and ground in order to allow "hands free" operation of the

listen/talk functions.

CALL BUTTON AND CALL DRY CONTACTS TO EXTERNAL DE-

VICE:

Depressing the call button sends a 1 kHz tone onto the signal

lines. All units listening to the line will then broadcast this signal as

a call. Depressing the call button also closes a normally open dry con-

tact rated at 0.4 amps @ 125 Vac or 1.25 amps @ 24 Vdc. This contact

can be used to trigger a remote sounder or light in order to accent the

call feature. The wiring diagram illustrates how an external light or

horn can be wired in to augment the call tone. (See figure 7.)

The call signal is substantially louder than normal voice mes-

sages being carried on the line. Do not depress the call switch

while carrying on a conversation with someone on the system.

This will subject the listener to very loud sound levels.

24 Vdc:

The AD-28LD-MV is capable of sending DC power to another unit

that is mounted in a remote location without local power. 24 Vdc is

available from positions 6 and 7 of terminal block J7. It can be run

along with the signal lines to an intercom in a remote location. Only

one unit should share the power supply of another unit in any instal-

lation. Figure 8 in the wiring diagrams section shows how two inter-

coms can be hooked up if no remote power is available.

If an intercom is intended to be run off of a separate 24 Vdc

supply, the output must be limited to 24 Vdc, 760 mA output.

CAUTION

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