3-78
Chapter 3
INSTALLATION AND SETTING PROCEDURES (HARDWARE)
8.4.3. 4-wire system connection
Two types of attenuators are connectable to this unit, one to be bypassed when 24 V DC is applied to the
attenuator, and the other to be bypassed when the 24 V DC being normally applied to is cut off (in no voltage
mode). Connections of the unit's attenuator control output and 24 V DC power supply's terminals differ depending
on the types as shown below.
[Example 1]
Bypassed when 24 V DC is applied to the attenuator.
H
C
C
(+)
DC Power supply
(–)
N C SP
Speaker
(+)
Relay Control
(–)
H
Attenuator
VX-3000F
H C
(+)
DC Power supply
(–)
Attenuator
C
N C SP
Speaker
(+)
Relay Control
(–)
H
VX-3000F
[Example 2]
Bypassed when the 24 V DC being normally applied to is cut off.
Note
The system in Example 2 is more fail-safe than that in Example 1.
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