Viking ZPI-4 Technical Practice page 5

2. Two Amplifier Mode (Paging and Music)
In the two amplifier mode, one amp serves as the paging amplifier and the other as the background music ampli-
fier. The paging or music signal is sent to the external amplifier, returned and the amplified signal is switched by the
ZPI-4 to the correct zone or zones.
Advantages: Any size amplifier may be used when driving 70V
speakers, only (2) amplifiers (or one stereo amp) are required for 4
zones, background music is selectable per zone, and the non-
paged zones will continue to to get music during a page.
Limitations: The paging amp needs to be limited to 200 watts and
the music amp needs to be limited to 70 watts when switching 8
ohm speaker loads, each speaker zone is limited to 8 ohms mini-
mum impedance and the amp must have the ability to drive the
speakers of all zones. (Example: 4 zones at 8 ohms per zone
equals a 2 ohm load during an all call.)
To set up the ZPI-4 in the two amplifier mode:
Step 1. Attach the ZONE 1 screw terminals to the speaker(s) for Zone 1.
Step 2. If background music is to be enabled on this zone, ensure that the
ZONE 1 music shunts are in place, covering both pins. If back-
ground music is not desired, remove the shunts.
Step 3. Repeat steps 1 and 2 for each of the remaining three zones.
Step 4. Attach the paging amplifier and the music amplifier as shown in
the diagram.
Step 5. Set DIP switch 1 to OFF.
3. Single Amplifier Mode
In this mode, one external amplifier handles both paging and background music. An internal relay capable of switch-
ing between paging signal and music signal sends input to this amp, the amplified signal is returned and the ZPI-4
sends it to the correct zone(s).
Advantages: Any size amplifier may be used when driving 70V
speakers, only one amplifier is required.
Limitations: The amplifier needs to be limited to 200 watts, each
speaker zone is limited to an 8 ohm minimum impedance, the
amplifier must be able to drive the speakers of all zones (Example:
4 zones at 8 ohms per zone equals a 2 ohm load during an all
call); if background music is used, all zones will receive back-
ground music and it will be muted in all zones during a page.
To set up the ZPI-4 in the single amplifier mode:
Step 1. Attach ZONE 1 screw terminals to the speaker(s) for Zone 1.
Step 2. Repeat step 2 for each of the remaining three zones.
Step 3. Attach the paging amp as shown in the diagram.
Step 4. If a background music source is being used, install the Optional
Background Music Amplifier jumpers as shown..
Step 5. Set DIP switch 1 to the ON position. This tells the ZPI-4 that
it is operating in the single amplifier mode.
Important: If a background music amplifier is not installed and
background music is required, install the Optional Background
Music jumpers as shown above.
Diagram 9
VIKING
MODEL ZPI-4
©
FOUR ZONE PAGING INTERFACE
VIKING
OPTIONAL PAGING AMP
ELECTRONICS
IN FROM AMP'S (-) OUTPUT
HUDSON, WI 54016 IN FROM AMP'S (+) OUTPUT
OUT TO AMP'S (-) INPUT
OUT TO AMP'S (+) INPUT
OPTIONAL MUSIC AMP
POWER
IN FROM AMP'S (-) OUTPUT
13.8 VAC
IN FROM AMP'S (+) OUTPUT
OUT TO AMP'S (-) INPUT
OUT TO AMP'S (+) INPUT
NIGHT CONTACTS
NIGHT RING
OUTPUT CONTACTS
INPUT CONTACTS
MUSIC OUT
MUSIC IN
TELCO OUT
TELCO IN
PWR 1 2 3 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 + - + - + - + -
ON
ZONE 1 ZONE 2 ZONE 3
Zone 1
Zone 2
Zone 3
Zone 4
Diagram 10
VIKING
MODEL ZPI-4
©
FOUR ZONE PAGING INTERFACE
VIKING
OPTIONAL PAGING AMP
ELECTRONICS
IN FROM AMP'S (-) OUTPUT
HUDSON, WI 54016
IN FROM AMP'S (+) OUTPUT
OUT TO AMP'S (-) INPUT
OUT TO AMP'S (+) INPUT
OPTIONAL MUSIC AMP
POWER
IN FROM AMP'S (-) OUTPUT
13.8 VAC
IN FROM AMP'S (+) OUTPUT
OUT TO AMP'S (-) INPUT
OUT TO AMP'S (+) INPUT
NIGHT CONTACTS
NIGHT RING
OUTPUT CONTACTS
INPUT CONTACTS
MUSIC OUT
MUSIC IN
TELCO OUT
TELCO IN
1 2 3 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 + - + - + - + -
PWR
ON
ZONE 1 ZONE 2 ZONE 3
Zone 1
Zone 2
Zone 3
Zone 4
NIGHT
WARBLE
VOLUME
PAGE
ALERT
VOLUME
PAGE
VOLUME
MUSIC
VOLUME
1 2 3 4 5 6 7 8
ZONE 4
Music
Amplifier
(not included)
Input
Output
Paging
Amplifier
(not included)
Input
Output
NIGHT
WARBLE
VOLUME
PAGE
ALERT
VOLUME
PAGE
VOLUME
MUSIC
VOLUME
1 2 3 4 5 6 7 8
ZONE 4
Paging
Amplifier
(not included)
Input
Output
5.