Toa VM-3000 Series - Manual (Page 124)

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.