Hubbell Gai-tronics 780-001 User manual

Pub. 42004-156D

GAI-Tronics P.O. Box 1060, Reading, PA 19607-1060 USA

610-777-1374 n800-492-1212 nFax: 610-775-6540

VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS

GAI-TRONICS®

A HUBBELL COMPANY

Model 780-001, 785-001, 7805-001, and

7855-001 Explosion-proof Handset

Stations

Confidentiality Notice

This manual is provided solely as an operational, installation, and maintenance guide and contains sensitive

business and technical information that is confidential and proprietary to GAI-Tronics. GAI-Tronics retains

all intellectual property and other rights in or to the information contained herein, and such information may

only be used in connection with the operation of your GAI-Tronics product or system. This manual may not

be disclosed in any form, in whole or in part, directly or indirectly, to any third party.

General Information

GAI-Tronics hazardous area Page/Party®handset stations are designed to provide safe and clear

communications in hazardous areas, even in high-noise situations. These models are NRTL certified for

use in the US and Canada for the following areas: Class I, Div. 1, Groups C and D; Class II, Div. 1,

Groups E, F, and G; and Class III, Div. 1.

Each of these models includes a front-panel push button for paging, a 6-foot PVC coil cord, a noise-

canceling microphone for reduced transmission of background noise, and sidetone circuitry to reduce

amplification of the user’s voice and background noise into their earpiece. An electrical safety barrier

mounted inside the housing creates an intrinsically-safe handset. Multi-party stations include a durable

rotary switch for party line selection. The weatherproof stations include a nonmetallic housing with a front

door. This installation manual covers the following models:

Model Description

780-001 Explosion-proof Handset Station, indoor, 120 V ac, single party

7805-001 Explosion-proof Handset Station, indoor, 120 V ac, multi-party

785-001 Explosion-proof Handset Station, weatherproof, 120 V ac, single party

7855-001 Explosion-proof Handset Station, weatherproof, 120 V ac, multi-party

This manual provides instructions for station placement and mounting. Refer to Pub. 42004-184, 42004-

238, or 42004-239, as applicable, for information detailing how to maintain the explosion-proof integrity

of the stations. The appropriate publication is packed with each station.

Sold by:

http://www.TWAcomm.com

Toll Free: (877) 892-2666

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WARNING Explosion Hazard – Do not connect or disconnect equipment unless power

has been switched off or the area is known to be non-hazardous.

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Installation

Whether installing an entire system or only an add-on station, consult the system layout diagrams at the end

of this manual. These figures, used in conjunction with the station installation information and the cable

layout guide, should provide all the information necessary to install the Page/Party®stations. These figures

do not show an explosion-proof station; however, the basic points of the system layout and design still

apply.

NOTE A separate power feed is recommended for Page/Party®stations in Div.1 areas. With a

separate power feed, the Page/Party®stations can be shut off for maintenance without disrupting the power

supply to the other equipment in the Div. 1 area.

Enclosure Placement

All GAI-Tronics Page/Party®units are wired in parallel. Good system layout design minimizes the cable

required for each installation. GAI-Tronics multi-conductor cable, designed especially for this application,

is recommended. The number, size, and color-coding of conductors are listed in the accompanying system

connection diagrams.

System layout and power cable length are important considerations when installing Page/Party®equipment.

The rules vary for different systems, but generally, the total power cable length should not exceed 1 mile

(5280 feet) for 115 V ac systems. The length of cable between the stations is not a factor; the total cable

length is the most important consideration.

Mounting

To maintain the explosion-proof integrity of these stations, all mounting hardware is located outside the

aluminum enclosure. The suggested mounting height for all station enclosures is 54 inches (137 mm) up to

the centerline of the enclosure.

Indoor Station: Mount the indoor unit using the two mounting straps on the rear of the enclosure. Refer to

Figure 1. Use the standard 3/8-inch bolts to secure the enclosure to the mounting surface. Secure the two

bottom bolts first, then the top bolts. The mounting strap design allows the station to be removed from its

mounting surface by removing only two of the bolts.

Outdoor Station: The outdoor model stations are shipped with a separate glass-reinforced polyester

enclosure with a front door. This enclosure has four 0.44-inch diameter mounting feet in the 4 corners and

is suitable for mounting to many types of surfaces. Refer to Figure 2.

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Figure 1. Mounting details for indoor stations

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Figure 2. Mounting details for outdoor stations (multi-party station shown)

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Conduit Installation

Refer to Pub. 42004-184 (US), 42004-238 (Canada) 42004-239 (Canada), as applicable. These

publications detail how to maintain the integrity of the explosion-proof stations.

NOTE External conduits in Class I, Groups C and D areas must have gas seals not more

than 18 inches (457 mm) from the station enclosure. External conduits in Class II and Class III

areas must have seals if the conduit system is not dust-tight.

Wiring

After the station is mounted, use a 7/16-inch wrench to open the front cover to access the Termination

PCBA. Refer to Pub. 42004-184 (US), and 42004-238 (Canada) or 42004-239 (Canada), as applicable

for wiring details.

Feed the wiring through the conduit and into the enclosure. Follow the wire colors carefully—these colors

correspond to GAI-Tronics 60029 or 60038 Series cable. The wires must be spade-lugged and connected

carefully and completely to the terminal block. An improper termination may result in diminished station

performance.

Before closing the station cover, plug the power interconnect cable from the front of the enclosure into the

connector on the power supply card in the rear enclosure.

NOTE All the bolts must be installed to maintain the integrity of the explosion-proof

construction.

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Speaker Muting Information

These stations are equipped with a muting feature that is used if the station is located near other

handset/speaker stations. This feature prevents acoustic feedback between stations during paging by

muting the station’s associated speaker. These stations are shipped from the factory with the mute feature

enabled.

To disable the muting feature, remove jumper W6 located on the 10489-001 Termination PCBA.. The

chart below describes how the muting function operates when specific combinations of wire jumpers W3,

W4, W5, and W6 are installed on the Termination PCBA.

W3 W4 W5 W6 Description of Muting Function Operation

OX X X The AUX/PAGE inputs to the amplifier are muted during station page

(as shipped from GAI-Tronics).

OX X OThe AUX/PAGE inputs to the amplifier are not muted during a station page.

OXOXMute the PAGE input only during a station page.

X X OXThe PAGE input is muted during a station page or by contact closure between

the Mute A and B inputs.

XOX X The PAGE/AUX inputs are muted during a station page or by contact closure

between the Mute A and B inputs.

XO O O The PAGE/AUX inputs are not muted. Isolated normally open relay contact

output between the Mute A and B terminals is closed during station pages.

X= Installed O = Not Installed.

Mutual Muting

Stations that are located closely together may require mutual muting of the page amplifiers. To set up

mutual muting between stations, connect the orange (spare) wire in the GAI-Tronics station cable to TB2-

11(A) on each of the Div. 1 stations that require muting. All the mutually muted stations are then muted

when any connected station is paging.

Note: Jumpers W4, W5, and W6 must be installed.

Mutual muting can be accomplished between the Div. 1 stations and Div. 2 enclosures using most

GAI-Tronics 600 or 700 Series enclosures by connecting the orange (spare) wire between TB2-11(A) on

the Div. 1 station and TB1-7 on the Div. 2 enclosure:

Div. 1 Stations

TB2-11(A) Div. 2 Enclosures (TB1-7)

7805-001 702A 758-001 7335-001

780-001 732-101 703A

670-001 7325-101 733-001

Consult GAI-Tronics for any enclosures not listed.

Note:The auxiliary speaker amplifier input is a balanced 10 kilohm audio input.

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Operation

GAI-Tronics offers two types of Page/Party®systems: Single party with one page line and one party line,

and multi-party with one page line and five party lines allowing up to five simultaneous two-way

conversations.

For single party systems,complete the following steps to make a page announcement:

1. Lift the handset from the cradle.

2. Depress and hold the handset pressbar.

3. Speak directly into the microphone to broadcast your announcement over the loudspeakers.

4. Release the handset pressbar, and if requested, wait for a response.

The paged individual(s) responds by picking up a station handset.

For multi-party systems, complete the following steps to make a page announcement:

1. Lift the handset from the cradle. If party line conversation is desired, rotate the selector switch to an

unoccupied party line.

2. Depress and hold the handset pressbar.

3. Speak directly into the microphone to broadcast your announcement over the loudspeakers.

4. Release the handset pressbar, and if requested, wait for a response.

The paged individual(s) responds by picking up a station handset and turning the selector switch to the

requested party line.

With either type of system, the full duplex party line communication is not broadcast over the system

speakers. Other individuals can also pick up and join the conversation at any time. Always return the

handset to the cradle following a page or a party line conversation.

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Maintenance

The following adjustments are accessible through the rear amplifier chassis using a small screwdriver. The

handset/speaker amplifier section must be completely removed from the enclosure to access these controls.

A silk-screen on the rear of the amplifier identifies the following controls.

•Microphone Gain: adjusts the gain level from the microphone signal to the page or party lines.

•Receiver Sidetone: adjusts the amount of signal transmitted from the microphone to the receiver. To

properly adjust the sidetone, blow into the handset microphone while turning the sidetone adjustment.

The sidetone is correctly set when the person blowing into the handset can barely hear themselves.

•Receiver Volume: adjusts the gain level from the party line to the receiver.

•Speaker Volume: adjusts the volume level of the speaker (if any) associated with this station.

Troubleshooting

The following table lists some hints to aid technicians in troubleshooting.

Problem Solution

Outgoing conversation level

requires adjustment. Adjust the microphone gain at the amplifier.

Incoming conversation level

requires adjustment. Adjust the receiver volume control at the amplifier.

Sidetone (how the operator

hears himself) requires

adjustment.

1. Adjust the receiver sidetone at the amplifier.

2. Check that the system cable connections to the resistors in the line

balance assembly are properly terminated.

Feedback occurs only during

page. Ensure the muting feature is enabled. See the Mutual Muting section of

this manual for details.

Crosstalk occurs. One or more system cable pairs may be improperly terminated. Visually

inspect the system cable connections for accidental crossing of the cable

pairs or grounds.

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Specifications

Power input................................................... 90-140 V ac; 120 V ac nominal, 50-60 Hz; 0.5 amp maximum

Dimensions:

Indoor stations............ 13.1 H ×7.9 W ×5.6 D (8.9 including handset) inches; (332 ×200 ×143 mm)

Outdoor stations ........................................... 14.6 H ×10.9 W ×10.5 D inches; (371 ×276 ×226 mm)

Temperature range................................................................................ -22 °F to +158 °F (-30 °C to +70 °C)

Shipping weight...............................................................Indoor: 27 lbs. (12.2 kg); outdoor: 35 lbs. (11.7 kg)

Handset

Material/finish....................................................................................................................................Gray ABS

Microphone................................................................................................ 10 ohms, noise-canceling, dynamic

Receiver............................................................................................................................... 150 ohms, dynamic

Cable...............................................................................Retractile with sealed elbow, 6-foot extended length

Handset Amplifier

Output............................................................................................................ 1.5 V nominal into 33-ohm load

Gain........................................................................................................................................ 55 dB, adjustable

Frequency response.................................................... 250-4000 Hz,+0/-3 dB ref @ 1 kHz (1.5 VRMS) output

Distortion........................................................................................................ 1.5% maximum THD @ 1 kHz

Preset adjustments .....................................................Microphone gain, sidetone adjustment, receiver volume

Speaker Amplifier

Output......................................................................... @120 V ac: 12 watt minimum into 8- or 16-ohm load

Voltage gain.......................................................................................................... 20 dB minimum, adjustable

Frequency response................................................................................. 250-4000 Hz; +0/-3 dB ref @ 1 kHz

Distortion............................................................................................. 1% maximum THD @ 1 kHz/12 watts

Input impedance............................................................................................. 50,000 ohm, minimum @ 1 kHz

Controls, preset adjustments.....................................................................................................Speaker volume

Explosion-proof Enclosure

Material/finish...........................................................................................................................Aluminum alloy

Mounting..........................................................................Wall or column, four 3/8-inch slotted mounting feet

Connections.................................................................................... Internal screw-type barrier terminal blocks

Conduit entry..................................Standard hole size top: ¾ NPT; standard size hole bottom 1½-inch NPT

Weatherproof Enclosure

Material/finish...........................................................................................................Glass-reinforced polyester

Mounting....................................................................................................................................Wall or column

Environmental rating ....................................................................................................................... NEMA 4X

Approvals