3-Wire System Connection; Changing The Speaker Line Voltage - Toa VM-2120 Instruction Manual

19.2. 3-Wire System Connection

Note: 3-wire system cannot be used with the SV-200MA board.
VM amplifier
ATTENUATOR
CONTROL* 1
EXTERNAL SP INPUT
DIRECT OUT
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 5
* This figure shows the relay operation status when the VM amplifier's power is switched off, when it is
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making All-zone or emergency broadcast or when its broadcast is cut off due to control from external
equipment in emergency broadcast mode.
* 2 May be connected to any C terminal. (This C terminal is located closest to N1 terminal.)

20. CHANGING THE SPEAKER LINE VOLTAGE

The work must be done by a qualified service technician only.
For the changing method, refer to the separate instruction manual for qualified service technicians.
ATTENUATOR CONTROL relay contact capacity
Withstand voltage: 30 V DC, 125 V AC
Contact current: Under 7 A (DC), under 7 A (AC)
N1 (NC)
C
N2 (NO)
H
* 2
C
H
H
C
H
C
H
C
H
C
H
C
External attenuators
H (100 V)
ZONE 1
C (0 V)
EMERGENCY
H (100 V)
ZONE 2
C (0 V)
EMERGENCY
H (100 V)
ZONE 3
C (0 V)
EMERGENCY
H (100 V)
ZONE 4
C (0 V)
EMERGENCY
H (100 V)
ZONE 5
C (0 V)
EMERGENCY
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