10
9. CONNECTIONS
9.1. Connecting to an AC power source
Designed for continuous operations, the unit has no power on/off switch on itself.
The unit's power cord should be connected to the Switched AC power outlet of the junction panel so that
power can be turned on and off for the entire amplifier rack.
9.3. Speaker Connection
Only connect speakers with an impedance equal to or greater than those specified.
Note
Connecting speakers with a smaller than specified impedance could cause damage to the amplifier.
9.4. Attenuator Connection
The unit has a built-in relay interlocked with the Priority control input.
The relay provides NC and NO terminals on the unit's rear panel.
For emergency broadcast, attenuators can be connected using either of the following two methods.
[3-wire system]
[4-wire system]
Use the DC power cable of AWG 16 or thicker (VP-1061 and
VP-1121) or AWG 12 or thicker (VP-1241 and VP-1361).
Also, be sure to firmly screw the cable to the terminal.
Failure to do so may cause the cable to generate heat,
possibly resulting in fire.
9.2. Connecting to a DC Power Source
When using a 24 V DC external power source, connect it to the DC
input terminals on the unit's rear panel. When the AC power fails, the
power is automatically switched to the DC power.
24 V DC power supply unit
WARNING
VP-1061 (60 W)
167
Ω
VP-1121 (120 W)
83
Ω
VP-1241 (240 W)
42
Ω
VP-1361 (360 W)
28
Ω
R
N
SP
Attenuator
Speaker
(+)
DC Power supply
(–)
Attenuator
Speaker
(–)
Relay
control
(+)
N
SP
Note
Use the attenuator with relay control terminals that
permit emergency broadcasts to bypass this
attenuator by 24 V DC power.
