Toa VM-3000 Series User Manual

Page 124

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124

VM-3240VA/3360VA rear

VM-3240VA/3360VA rear

Inside of the VM-3240VA/3360VA

How the surveillance function works under normal condition

How the surveillance function works under emergency condition

Inside of the VM-3240VA/3360VA

(Fire alarm or other control equipment)

24 V DC

-

+

24 V DC

+

-

Emergency control input
terminal 6

Control output terminals of the external device

(Fire alarm or other control equipment)

Control output terminals of the external device

Emergency control
input terminal 6

COM

Voltage
detector

The function judges the line
normal when 24 V DC is
detected at the emergency
control input terminal 6.

CTRL IN 6

COM

CTRL IN 6

COM

Emergency control
input terminal 6

COM

The function judges the line
normal when 24 V DC is
detected at the COM terminal.

Voltage
detector

Emergency control input
terminal 6

[Voltage control input terminal (EMERGENCY CONTROL 6)]

24 V DC is kept applied to the COM terminal under normal condition. Reversing this applied voltage polarity
activates an emergency broadcast.
The surveillance function judges the line normal when 24 V DC is detected at the COM terminal under
normal condition and when 24 V DC is detected at the emergency control input terminal 6 under emergency
condition.
It judges the line open if no voltage is detected under any condition.
The figures below show the line surveillance methods under normal and emergency conditions.

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