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19. EXTERNAL ATTENUATOR CONTROL WIRING
19.1. 4-Wire System Connection
* This figure shows the relay operation status when the VM amplifier's power is switched off, when it is making
All-zone or emergency broadcast or when its broadcast is cut off due to control from external equipment in
emergency broadcast mode.
ATTENUATOR CONTROL relay contact capacity
Withstand voltage: 30 V DC, 125 V AC
Contact current: Under 7 A (DC), under 7 A (AC)
ATTENUATOR
CONTROL*
EXTERNAL SP INPUT
VM amplifier
DIRECT OUT
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 5
N1 (NC)
N2 (NO)
H
C
C
H
H
C
+
–
H
C
H
C
H
C
H
C
H
C
Relay control
ZONE 1
External attenuators
External DC power supply
to activate attenuators
H
C
Relay control
ZONE 2
H
C
Relay control
ZONE 3
H
C
Relay control
ZONE 4
H
C
Relay control
ZONE 5