42004-251A
Pub. 42004-251A
GAITRONICS® CORPORATION
A HUBBELL COMPANY
Installation of Call/Talk Systems
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
This publication contains information relating to Model MOD5300A, MOD5400A, and MOD5500A
Call/Talk Stations. They consist of the following subassemblies:
A01B
B01B
B02B
B04
C01B
D01B
System layout should be planned in advance of installation. Stations should be located carefully, taking
convenience, accessibility, and personnel safety into account. The quantity and location of paging speakers
must be carefully considered, particularly in areas of high ambient noise or reverberation. The speaker
amplifier built into each station drives one horn-loaded paging speaker. If additional paging speakers are
needed, separate speaker amplifiers can be added to the system. In quiet areas, such as offices, several
paging speakers can be connected to a single station. Please see publication 42004-135 Speaker/Horn
Installation for GAI-Tronics Communication Systems or consult a GAI-Tronics sales representative for
additional system planning information.
All units are wired in parallel. Good planning will minimize the cable required for each installation.
GAI-Tronics can supply multi-conductor cable designed especially for this application. The number, size,
and color coding of conductors are listed in the accompanying system connection diagrams. Standard cable
has 600-volt insulation and is UL-rated for power cable tray use. The maximum standard cable length is
5,250 feet (1600 m) from the line balance assembly. For larger systems or non-standard cable, please
contact a GAI-Tronics representative.
The cable described above includes conductors to provide ac power to each station. All stations operate
from a common source, enhancing reliability, particularity if no other ac load is placed on the circuit
breaker or branch line feeding the system. This configuration also allows easy transfer to an emergency
power source in the event of a power failure. However, if preferred, each station may be individually
powered from a nearby nominal 115 volt, 50 or 60 Hz single-phase outlet.
WARNING
Do not install in any hazardous locations; such installations may cause a safety
hazard and consequent injury or property damage.
NOTICE: Effective Jan. 1, 2005, the Call/Talk communication system and its components will not
maintain any nationally recognized laboratory approval for hazardous locations.
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 „ 800-492-1212 „ Fax: 610-796-5954
VISIT WWW .GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
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Installation of Call/Talk Systems
STEP 1 - Station and Speaker Amplifier Enclosure Mounting
Each Call/Talk station consists of an enclosure, a cover plate, a power supply, and a speaker amplifier
module. Each enclosure provides a terminal strip for connecting interstation cable. The 16-gauge coldrolled steel/light gray enamel enclosures use internal screw-type barrier terminal blocks. The suggested
mounting height for all station enclosures is 54 inches (137 cm).
STEP 2 - Line Balance Assembly Mounting
One line balance assembly is required for each communications system. The function of the line balance
assembly is to properly load the page and the party line circuits. There are three primary considerations in
determining the location of the line balance assembly:
•
It should be near the electrical center of the system.
•
It should be adjacent to the indoor station in a relatively quiet area.
•
It should be no more than 5,250 feet (1600 m) from the most distant station when using GAI-Tronics
standard cable. For larger systems or when non-standard cable is to be used, please contact a
GAI-Tronics representative for further information.
The line balance assembly has one electrical adjustment that must be made while using a station (see the
Step 5 - Checkout and Adjustment section).
The preferred mounting method is to suspend the assembly by a 1-inch conduit nipple (not supplied) from
the lower side of an indoor wall station. The terminal blocks of the line balance assembly and the
associated indoor wall station must be connected by one twisted pair for the page circuit and one similar
pair for each party line. Refer to the typical wiring diagrams on pages 8 and 9 for the connections between
the Model 305 Series Line Balance Assembly and the wall station enclosure.
STEP 3 - Inter-station Conduit and Cable Installation
Generally, interstation cables are installed in cable trays or conduit. To help determine the required conduit
sizes, the outside diameters of the GAI-Tronics cables discussed in this manual are listed in the following
table:
Cable
Conductors
Outside Diameter
60038-101
8
0.60 in. (15.1 mm)
60029-101
16
0.68 in. (17.2 mm)
The size and installation of conduit and cable must meet the requirements of applicable electrical codes. A
ground conductor, with green/yellow insulation, should be included with the cable in any area where no
conduit or non-metallic conduit is used. Non-metallic enclosures used with metallic conduit and cables
without a ground conductor require a bond between the conduit(s) and the ground terminal (terminal 3)
within the enclosure.
WARNING
No station is to be installed or operated without having a proper ground.
Where GAI-Tronics cable is installed, each conductor should be lugged and attached to the terminal. This
must be performed in accordance with the color code shown on the applicable accompanying wiring
diagrams, or with special drawings provided for this purpose.
NOTE: Some cables have an orange (spare) conductor. Unless otherwise instructed, this conductor should
be taped and not connected to the terminal strip(s) in the enclosures.
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STEP 4 - Amplifier and Subset Installation
Call/Talk equipment is factory set for automatic local speaker muting. When the push-to-page switch is
pressed at a particular station, the paging speaker connected to that station is silenced, preventing acoustic
feedback to the handset microphone. For cases where the muting feature is not necessary or may be a
disadvantage, it can be disconnected by removing the jumper between the MUTE IN and the MUTE OUT
terminals.
Remote Muting
Additional amplifiers can be muted by the paging station by connecting its MUTE OUT terminal to the
MUTE IN terminal of all affected amplifiers. This can be performed to avoid feedback from stations in
proximity of each other. A common ground must be present at all stations to be muted. Connect one end
of the GAI-Tronics orange cable wire to the MUTE IN of one station, and connect the other end to the
MUTE OUT of another station. Continue this procedure until all stations in that area are connected. To
ensure that the stations are correctly wired, initiate a page from a station, and verify that speaker muting is
occurring where desired.
After making any necessary muting changes, unpack and install the C01B power supply and the D01B
speaker amplifier. The C01B and the D01B modules plug directly into the motherboard located in the
station enclosure. Secure the module to the enclosure mounting bracket using the captive screws provided
with the modules. The ribbon cable from the front panel containing the handset amplifier plugs into the
mating connector on the motherboard. The cover plate should also be plug-connected to the motherboard
and securely mounted to the enclosure using the hardware provided.
Step 5 - Checkout and Adjustment
All field wiring connections (page line, party line(s), mute, ac power, and speaker) between stations must
be tested, and the line balance assembly installation must be complete before checkout begins. Every
handset should be on-hook.
Apply the ac power, and check the station next to the line balance assembly. Press the push-to-page switch
(in the handset handle on some stations), and speak firmly and directly into the microphone of the handset.
The broadcast should be heard at all paging speakers in the system except those associated with the station
under test. The operator should hear little or no sidetone (the user hearing his voice from the earpiece of
the handset). If the line balance assembly is not connected properly, there will be a high level of sidetone,
perhaps enough to cause feedback. The line balance assembly adjusts to optimize sidetone rejection on the
page line. If the system is complete when the first station is checked, adjust the line balance assembly as
presented in the Line Balance Assembly Adjustment section below. Do NOT adjust the station (amplifier)
controls until the line balance assembly is adjusted.
Release the push-to-page switch, and check the party line(s) sidetone level. Again, the operator speaking
into the microphone of the handset should hear very little or none of his own voice from the earpiece in the
handset. This sidetone rejection will only occur if the line balance assembly is properly connected, because
it contains a fixed resistor load for each party line. In addition, no party line adjustments are provided;
therefore, party line operation is checked by conversing between two or more stations.
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Line Balance Assembly Adjustment
Remove the line balance assembly cover to expose the page line balance control. To set the control for
proper page circuit loading, lift the handset from the adjacent handset hook, and press the push-to-page
button. From a normal speaking distance (approximately ½ inch), blow steadily into the handset
microphone, and adjust the control to minimize receiver sidetone. This adjustment should be made only
during the initial installation of a system. However, if more than ten speaker amplifiers are added or
deleted, repeat the page line balance control adjustment.
After the final adjustment, replace the line balance assembly’s cover, and secure it with the 4 mounting
screws to discourage tampering by unauthorized personnel and to prevent the entry of contaminants.
Handset Preamp Adjustment
The screwdriver-adjusted potentiometers are located on the printed circuit board mounted on the inside of
the cover plate. R3 is the transmit level potentiometer and R13 is the receiver volume potentiometer. All
the handset preamps are factory set but may require a level adjustment due to system loading and/or long
cable runs. Party-line level checks should be approximately 0.75 VRMS when whistling into a handset
microphone. Adjust the transmit level if the voltage is not correct from a station. Receiver volume must be
adjusted according to the noise in the area and the preference of the user.
Speaker Amplifier Adjustment
A nameplate on the D01B module indicates the position of the thumbwheel adjustment. The speaker
amplifiers are factory set for approximately half output with a normal voice input. The output must be
adjusted to suit conditions in the area. Maximum output is 9.8 V for an 8-ohm speaker. If maximum
output is desired, whistle into a handset, and set the output for approximately 9 V for an 8-ohm speaker.
Step 6 - Troubleshooting System Problems
Hum or Buzz on the Line
A hum or buzz on the page circuit (or one or more party circuits) is usually due to either a short circuit of
one of the two conductors for each circuit to the ground or an unbalanced leakage to the ground. As long
as the two conductors are twisted pairs, and there are no significant leakage paths or short circuits to the
ground, any induced voltages are the same on both conductors and do not appear across the line.
To correct the problem, locate the source of the ground. Using an ohmmeter, check various junction points
of the system wiring to determine in which direction the ground can be located. By going from one junction
point to another and disconnecting the affected circuit, the ground is located. The fault could be within a
plug-in amplifier. However, most grounded circuits occur due to improper terminations or are caused by
small strands protruding from an improperly lugged wire.
Another source of grounds or near-grounded circuits is junction boxes filled or partially filled with water.
In many cases, there are deposits in the boxes, which when combined with water, produce conductive or
corrosive solutions. These deposits cause leakage between circuits and can corrode the wire and terminals.
Isolation of field wiring may be necessary for test purposes. If such isolation removes the line balance
assembly from the operating portion of the system, a 33-ohm, ½-watt resistor should be connected across
L1 and L2 of the Page/Party® line circuits. These resistors must be removed after completion of the tests.
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Feedback or Distortion on the System
Each page and party circuit must be loaded to the optimum 33 ohms using the line balance assembly. If the
line balance is not connected or is defective, the system will have excessive gain and will break into
feedback quite easily. The voice will also be distorted, and there will be a high level of sidetone in the
handset receiver.
Each party line is terminated with a fixed 33-ohm resistor in the line balance assembly. However, an
adjustable control is provided for the page line to compensate for the number of speaker amplifiers
connected to the system. Improper adjustments will affect gain and will increase the level of sidetone. See
the specific instructions for adjusting the line balance assembly in the Step 5 - Checkout and Adjustment
section.
Very Low Audio Level on One or More Lines at All Stations
It is possible for all or part of the system to function with a dead short across the page or party circuits. If
this occurs, the level of the system will be very low, decreasing to a minimum level in the vicinity of the
short circuit. To locate the short circuit, it is necessary to proceed in the same way as locating a ground
checking junction points with an ohmmeter.
Cross Talk
Cross talk, or inter-channel interference, is generally caused by the accidental crossing of circuits in a
junction box. To check for this condition, measure the resistance between the circuits of the interfering
channels. The resistance should be a very high value or infinite. Leakage or shorts to the ground in two or
more circuits can result in cross talk on those circuits.
In a multi-party line system, it is possible to have a small amount of cross talk between channels if the line
balance resistors are open or not connected. This condition can be detected by the presence of high
sidetone in the handset.
Static Charges
In many normal installations, a static ac voltage may be read from the conductors of the page and party line
circuits to the ground. In many cases, this voltage may be as high as 50 volts or more. This voltage is
induced into the circuits by capacitance to the ac power circuit (generally carried in the same cable and also
from power cables paralleling the communication cables). This voltage is inconsequential and can be
ignored. Only when one side of the page or party circuit becomes grounded are any undesirable effects
produced.
Audio Voltage
In a properly operating system, audio voltage read across any of the page or party circuits (L1 to L2) will
be 0.5 to 0.75 volts ac on peaks when an audio signal is present such as when someone is speaking into a
handset. The voltage will be proportional to the loudness of the person’s voice using the handset.
One Inoperative Station in a Working System
Except for a wiring error, an inoperative station indicates a defect in the amplifier at that station. This is
quickly checked by installing a spare amplifier or exchanging amplifiers with a properly operating station.
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Installation of Call/Talk Systems
Safe Power Connection/Disconnection
The equipment will not create arcs or sparks, in normal operation, when completely installed and powered.
Installing or removing an amplifier or plugging in a live enclosure is not normal operation and can create
arcs. To guarantee safety, adhere to the following caution note.
CAUTION
Do not insert or remove equipment from the live enclosures.
A better arrangement uses a separate power disconnect.
Connect the field wiring as detailed in the instructions for the same equipment.
Call/Talk Stations
Consists of‘
Station
Model No.
Description
Enclosure
Cover
Plate
Power
Supply
Speaker
Amplifier
MOD5300A
Indoor Single-party Handset/ Speaker
Station
A01B
B01B
C01B
D01B
MOD5400A
Indoor Multi-party Handset/ Speaker
Station
A01B
B02B
C01B
D01B
MOD5500A
Indoor Speaker Amplifier Station
A01B
B04
C01B
D01B
‘
Components are packaged separately for shipment.
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Specifications
Cover Assembly (B01B, B02B, B04)
Handset Amplifier Circuit and Handset Assembly (B01B, B02B)
Output level..........................................................................................1.5 VRMS nominal into 33-ohm load
Output limiter ................................................................................................................. 1.5 VRMS nominal
Frequency response................................................................................................ 300-6500 Hz +/-1.5 dB
Distortion ................................................................................ 1.5% max. THD @ 1 kHz at 1.25 V output
Controls...................................................................... Transmitter level, receiver volume, handset pressbar
Microphone ......................................................................................................... Noise-canceling dynamic
Receiver ...........................................................................High efficiency dynamic; hearing aid compatible
Cable.........................................................................................................Retractile, 7-foot extended PVC
External controls........... B02B ................................................Party-line selector switch; 5 switch positions
Dimensions................... B01B, B02B .......... 7.75 W × 8.25 H × 3.75 D inches (196.9 × 209.6 × 95.3 mm)
with handset
B04.................................................. 7.75 W × 8.25 H inches (196.9 × 209.6 mm)
Material/finish ......................................................................... 16-gauge cold-rolled steel/light gray enamel
Shipping weight ............ B01B, B02B ...................................................................................4 lbs. (1.8 kg)
B04.................................................................................................2 lbs. (0.9 kg)
Speaker Amplifier Circuit (D01B)
Output........................................................................................12 watts minimum into 8- or 16-ohm load
Amplifier sensitivity.............................................................................................. 0.5 V ac, at rated output
Frequency response................................................................................................................ 250-6500 Hz
Distortion ............................................................................................ Less than 1% THD at 12 W, 1 kHz
Input impedance........................................................................................................ 25,000 ohms nominal
Controls.................................................................. Speaker volume (adjusted by removing cover the plate)
Dimensions............................................................................................. 3.75 W × 2.69 H × 2.06 D inches
Shipping weight ..................................................................................................................... 1 lb. (2.2 kg)
Power Supply (C01B)
Voltage................................................................................................................. 105-130 V ac, 50/60 Hz
Power consumed........... Zero/Max signal.............................................................3 W, 4 VA/30 W, 35 VA
Dimensions.................................................... 3.75 W × 2.69 H × 2.75 D inches (95.3 × 68.3 × 69.85 mm)
Shipping weight ....................................................................................................................2 lbs. (1.1 kg)
Enclosure (A01B)
Material/finish ..................................................... 16-gauge cold-rolled steel/light gray enamel (NEMA-12)
Mounting.......................................................................................Four 0.38-inch diameter mounting holes
Connections ........................................................... Internal screw-type (single row) barrier terminal blocks
Temperature range...........................................................................................................-30° C to +70° C
Shipping weight ....................................................................................................................6 lbs. (2.7 kg)
Dimensions...................................................... 8.75 H × 7.5 W × 3.5 D inches (222.3 × 190.9 × 88.9 mm)
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Installation of Call/Talk Systems
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Warranty
Equipment.
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any
GAI-Tronics equipment supplied hereunder shall be free of defects in material and workmanship, shall
comply with the then-current product specifications and product literature, and if applicable, shall be fit
for the purpose specified in the agreed-upon quotation or proposal document. If (a) Seller’s goods prove
to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above,
Buyer may return such goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time
they will be repaired or replaced, at Seller’s option, without charge to Buyer. Repair or replacement shall
be Buyer’s sole and exclusive remedy. The warranty period on any repaired or replacement equipment
shall be the greater of the ninety (90) day repair warranty or one (1) year from the date the original
equipment was shipped. In no event shall GAI-Tronics warranty obligations with respect to equipment
exceed 100% of the total cost of the equipment supplied hereunder. Buyer may also be entitled to the
manufacturer’s warranty on any third-party goods supplied by GAI-Tronics hereunder. The applicability
of any such third-party warranty will be determined by GAI-Tronics.
Services.
Any services GAI-Tronics provides hereunder, whether directly or through subcontractors,
shall be performed in accordance with the standard of care with which such services are normally
provided in the industry. If the services fail to meet the applicable industry standard, GAI-Tronics will
re-perform such services at no cost to buyer to correct said deficiency to Company's satisfaction provided
any and all issues are identified prior to the demobilization of the Contractor’s personnel from the work
site. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall GAITronics warranty obligations with respect to services exceed 100% of the total cost of the services
provided hereunder.
Warranty Periods.
Every claim by Buyer alleging a defect in the goods and/or services provided
hereunder shall be deemed waived unless such claim is made in writing within the applicable warranty
periods as set forth above. Provided, however, that if the defect complained of is latent and not
discoverable within the above warranty periods, every claim arising on account of such latent defect shall
be deemed waived unless it is made in writing within a reasonable time after such latent defect is or
should have been discovered by Buyer.
Limitations / Exclusions.
The warranties herein shall not apply to, and GAI-Tronics shall not be
responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent
caused by Buyer’s neglect, failure to follow operational and maintenance procedures provided with the
equipment, or the use of technicians not specifically authorized by GAI-Tronics to maintain or service the
equipment. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE IN LIEU OF AND
EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER EXPRESS OR IMPLIED BY
OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Return Policy
If the equipment requires service, contact your Regional Service Center for a return authorization number
(RA#). Equipment should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the equipment is under warranty, repairs or a replacement will be made in
accordance with the warranty policy set forth above. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 (inside the USA) or 610-777-1374 (outside the USA) for help identifying the
Regional Service Center closest to you.
(Rev. 10/06)
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