GAI-Tronics 780-301 Page/Party Handset Station (Cenelec Zone 1) - Manual (Page 6)

Pub. 42004-638L2
Model 780/7805-301 Page/Party
®
Handset Stations for Cenelec Zone 1 Applications Page: 6 of 15
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Mounting
N OTE : The mounting surface must be able to support 55 lbs. (25 kg). The explosion-proof
enclosure is very heavy. Handle carefully to avoid damage to the unit and personnel injury.
1. Remove the cast aluminum front panel. Allow it to hang from the rear of the enclosure by means of
two retaining straps during installation. The straps serve as personnel safety feature and as a
safeguard designed to ensure the flame path opening is not nicked, dented or otherwise damaged
while mounting the enclosure.
2. To maintain the explosion-proof integrity of the enclosure, all mounting hardware is located in
non-intrusive mounting holes under the front panel. The suggested mounting height of the station is
54 inches (137 cm) to the centerline of the enclosure. Use standard 1/2-inch socket head cap screws
or M12 bolts to secure the enclosure to a flat mounting surface.
3. After the enclosure is securely mounted, remove the plug-in amplifier as follows:
• Disengage the 24-pin connector between the aluminum front cover and the plug-in amplifier.
• Remove the four screws that secure the amplifier to the standoffs, and retain.
• Pull the amplifier straight toward you to disengage the 16-pin connector from the enclosure.
• Set the amplifier aside in a safe place while completing the installation.
4. Make up cable core ends as required for connection to the terminal blocks in the enclosure base.
5. Dismantle the outer parts of the 25 mm Ex ‘d’ cable gland(s) for the system cable and 16 mm Ex ‘d’
cable gland for the speaker cable and thread them onto the cable(s) in the correct order.
6. Feed the cable end(s) into the enclosure through the gland body or bodies and reassemble the outer
gland parts as directed by the manufacturer. Check that the slack in the cable inside the enclosure is
adequate but not excessive before tightening of the gland assembly.
7. Connect cable cores to terminals following the wire colors as illustrated in Figure 6 for single party
and Figure 7 for multi-party systems. The wire colors correspond to GAI-Tronics 60071 and 60072
Series System Cable and 60070 Speaker Cable. Connect the wires carefully and completely to the
terminal block. An improper termination may result in diminished station performance.
N OTE : Determine if acoustical feedback is likely to be a problem, and adjust the speaker orientation,
if necessary. As a last resort, the associated speaker can be muted by moving the violet wire on the
enclosure on TB1 to terminal 7.
8. Install the amplifier by aligning the 16-pin connector to the enclosure socket and pushing straight in.
Install the four screws retained previously.
9. Inspect the gasket and machined rim of both the cover and the enclosure for nicks, scratches, or other
damage that could compromise the integrity of the flame path seal. If damaged, the cover may have
to be replaced.
10. Reconnect the 24-pin connector to the aluminum front cover and to the plug-in amplifier.
11. Secure the front cover to the cast aluminum enclosure using the bolts provided. Tighten the bolts
alternately with bolts that are diagonally opposite to ensure that the cover is evenly sealed.