Main Pcba-600-Ohm Audio I/O With Control - GAI-Tronics SP2 Manual

SP2 Fiber Hazardous-Area Handset/Speaker Amplifier Station
Power
The ac or optional dc power supply is mounted on the Termination PCBA. The termination PCBA
includes terminal block TB3 for connecting the local power source to the station (see Figure 6):
1. Pull the cable from the power source into the enclosure.
2. Connect spade lugs to the wires.
3. Connect the conductors from the ac or dc power source to the appropriate terminals at terminal block
TB3 (see Table 4 or Table 5).
Table 4. AC Power—TB3
Pin Label
TB3-1 LINE
TB3-2 NEUTRAL
⏚
TB3-3
Main PCBA—600-Ohm Audio I/O with Control
SP2 stations provide a 600-ohm audio input to facilitate broadcasting line level audio over the page line.
A control input exists that requires a normally open dry contact closure to enable the station to broadcast
the 600-ohm input audio. SP2 stations also provide a 600-ohm audio output for sending page line audio
to a remote audio amplifier. A solid state dry-contact relay is provided that can be used to control when
the remote audio amplifier plays the audio.
1. Pull the cable for the 600-ohm audio I/O into the enclosure.
2. Install ferrules onto the wire ends.
3. Connect the 600-ohm audio wires to the pluggable terminal block for the 600-ohm audio I/O
connection (see Table 6 and Figure 10).
4. Connect the pluggable terminal block to terminal block receptacle TB1.
Table 6. 600-Ohm Audio I/O Interface Connections—TB1
TB1-1
TB1-2
TB1-3
TB1-4
TB1-5
TB1-6
TB1-7
TB1-8
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Description
Positive
Negative
Earth ground
Pin Label
I CT1+
N
CT1−
I
N
I A +
N UD
−
I A
N UD
O A +
UT UD
−
O A
UT UD
O CT1+
UT
CT1−
O
UT
Table 5. DC Power—TB3
Pin Label
TB3-1 +
−
TB3-2
TB3-3
Description
Input Control Positive
Input Control Negative
Input Audio Positive
Input Audio Negative
Output Audio Positive
Output Audio Negative
Output Control Positive
Output Control Negative
Pub. 42004-792L2A
Page 11 of 22
Description
Positive
Negative
No Connection