Pub. 42004-431B GAI-TRONICS® CORPORATION A HUBBELL COMPANY 370-301 Dual Channel 600-Ohm to 33-Ohm Converter 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 The Model 370-301 Dual Channel 600-Ohm to 33-Ohm Converter allows GAI-Tronics’ Page/Party® systems to interface with standard 600-ohm networks for one- or two-way communication between dissimilar transmission mediums. The 370-301 includes two hybrid interfaces in each channel to isolate the audio so that the received audio in one direction does not affect the transmit audio in the other direction. The 370-301 includes a VOX (voice activated switch) on each of the outputs. The VOX samples the audio out to the line. In the presence of audio, a relay is activated for receive amplifier activation. Features Two independent conversion circuits, one for party lines and one for page lines Individual gain and sidetone adjustment for each audio path VOX detection on 33-ohm and 600-ohm interface for activating a receiving amplifier AC or dc power operation 33-ohm termination internal to unit Figure 1. Outline of 370-301 GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA 610-777-1374 800-492-1212 Fax: 610-796-5954 VISIT WWW .GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS 370-301 Dual Channel 600 to 30-Ohm Converter Pub. 42004-431B Page 2 of 9 Installation Important Safety Instructions 1. Read, follow, and retain instructions – All safety and operating instructions should be read and followed before operating the unit. Retain instructions for future reference. 2. Heed warnings – Adhere to all warnings of the unit and in the operating instructions. 3. Attachments - Attachments not recommended by the product manufacturer should not be used, as they may cause hazards. 4. Servicing – Do not attempt to service this unit by yourself. Opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel. 5. This permanently connected apparatus must have a UL Listed 15-amp circuit breaker incorporated in the electrical installation of the building. USA and Canada Consult the National Electrical Code (NFPA 70), Canadian Standards Association (CSA 22.1), and local codes for specific requirements regarding your installation. Class 2 circuit wiring must be performed in accordance with NEC 725.55. WARNING In 24 V dc systems: Under NO condition should this equipment be operated from a battery charger without the batteries connected. In 24 V dc systems, most chargers have an unloaded output of 35 to 45 volts that can quickly damage the equipment designed for nominal 24 volts. The maximum battery voltage should never exceed the maximum specified input voltage. Mounting the Enclosure NOTE: The enclosure is intended for indoor use only. Mount the enclosure using the four 0.312-inch (8 mm) diameter holes located on the mounting flanges with ¼-inch (M6) hardware. The 370-301 is not supplied with conduit or cable openings. Remove the front panel and drill or punch entry openings in the rear section of the enclosure Refer to Figure 2 for the suggested locations. There must be a minimum of ½ inch (13 mm) of material between entry holes. The station is suitable for top or bottom entry per Figure 2. However, GAI-Tronics recommends bottom entry only wherever possible. The standard orientation shown in Figure 2 locates the power supply housing in the upper left corner. The orientation of the enclosure can be rotated 180º to allow clear access to the top. The 69856-xxx PCBA can then be rotated for correct orientation. For specific details including mounting hole dimensions, refer to Figure 2. When mounting the enclosure, use caution to avoid damaging the internal components. f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 370-301 Dual Channel 600 to 30-Ohm Converter Figure 2. Mounting Details and Wire Entry Locations f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 Pub. 42004-431B Page 3 of 9 370-301 Dual Channel 600 to 30-Ohm Converter Field Wiring Refer to Figure 3, 69856-001 PCBA, for reference to connection locations. Figure 3. 69856-001 PCBA f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 Pub. 42004-431B Page 4 of 9 Pub. 42004-431B Page 5 of 9 370-301 Dual Channel 600 to 30-Ohm Converter Power The 370-301 Converter can be powered from a universal ac power source or 12 to 24-volt dc source. NOTE Do not use an ac or dc power source at the same time. When using a universal ac power source, TB1 is used for field wiring and P1 or P2 are used to connect to the ac to dc power supply in the unit. Attach #6 spade lugs to the wires before attachment to the terminal blocks for the most secure connection. TB2 is not used in this configuration. Table 1. Universal AC Power Connections – TB1 Pin Number Pin Name 1 Input Line 2 Input Neutral 3 Earth When using a dc power source, TB2 is used for the field wiring. Attach #6 spade lugs to the wires before attachment to the terminal blocks for the most secure connection. TB1, P1 and P2 are not in this configuration. Table 2. 12–24 Volt DC Connections – TB2 Pin Number Pin Name 1 12–24 V dc + 2 12–24 V dc - 3 Earth f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 370-301 Dual Channel 600 to 30-Ohm Converter Pub. 42004-431B Page 6 of 9 Audio and Control Signals The 370-301 allows access to the audio line inputs and output along with relay contacts for the VOX detection. Table 3. 600-Ohm Connections Channel 1, P4 Pin Number Pin Name Function 1 NC 600-ohm active Normally closed connection of 600-ohm output VOX detection. 2 COM 600-ohm active Common connection of 600-ohm output VOX detection. 3 NO 600-ohm active Normally open connection of 600-ohm output VOX detection. 4 GND Ground reference for field wiring. 5 L1 600-ohm audio Bi-directional audio for 600-ohm interface 6 L2 600-ohm audio Bi-directional audio for 600-ohm interface Table 4. 33-Ohm Connections Channel 1, P6 Pin Number Pin Name Function 1 NC 33-ohm active Normally closed connection of 33-ohm output VOX detection. 2 COM 33-ohm active Common connection of 33-ohm output VOX detection. 3 NO 33-ohm active Normally open connection of 33-ohm output VOX detection. 4 GND Ground reference for field wiring. 5 L1 33-ohm audio Bi-directional audio for 33-ohm interface 6 L2 33-ohm audio Bi-directional audio for 33-ohm interface INTELLECTU Table 5. 600-Ohm Connections Channel 2, P10 Pin Number Pin Name Function 1 NC 600-ohm active Normally closed connection of 600-ohm output VOX detection. 2 COM 600-ohm active Common connection of 600-ohm output VOX detection. 3 NO 600-ohm active Normally open connection of 600-ohm output VOX detection. 4 GND Ground reference for field wiring. 5 L1 600-ohm audio Bi-directional audio for 600-ohm interface 6 L2 600-ohm audio Bi-directional audio for 600-ohm interface f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 370-301 Dual Channel 600 to 30-Ohm Converter Pub. 42004-431B Page 7 of 9 Table 6. 33-Ohm Connections Channel 2, P12 Pin Number Pin Name Function 1 NC 33-ohm active Normally closed connection of 33-ohm output VOX detection. 2 COM 33-ohm active Common connection of 33-ohm output VOX detection. 3 NO 33-ohm active Normally open connection of 33-ohm output VOX detection. 4 GND Ground reference for field wiring. 5 L1 33-ohm audio Bi-directional audio for 33-ohm interface 6 L2 33-ohm audio Bi-directional audio for 33-ohm interface Settings and Adjustments Opening the Station Remove the four screws from the front panel and place the front panel to the side. Jumper Settings Channel 1: 33-Ohm Activation P3 - Install the jumper in the ACT (default) position to enable the 33ohm audio output. Install the jumper in the NON position to disable the 33-ohm audio output. Channel 1: 33-Ohm Termination P8 - The Page/Party® line can be terminated to 33 ohms as required by the Page/Party® system. Install the jumper in the TERM position to terminate the line. Install the jumper in the NON (default) position to leave the line unterminated. For the unterminated position, a line balance assembly is needed in the system. Channel 1: 600-Ohm Activation P7 - Install the jumper in the ACT (default) position to enable the 600-ohm audio output. Install the jumper in the NON position to disable the 600-ohm audio output. Channel 2: 33-Ohm Activation P9 - Install the jumper in the ACT (default) position to enable the 33-ohm audio output. Install the jumper in the NON position to disable the 33-ohm audio output. Channel 2: 33-Ohm Termination P14 - The Page/Party® line can be terminated to 33 ohms as required by the Page/Party® system. Install the jumper in the TERM position to terminate the line. Install the jumper in the NON (default) position to leave the line unterminated. For the unterminated position, a line balance assembly is needed in the system. Channel 2: 600-Ohm Activation P13 - Install the jumper in the ACT (default) position to enable the 600-ohm audio output. Install the jumper in the NON position to disable the 600-ohm audio output. f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 370-301 Dual Channel 600 to 30-Ohm Converter Pub. 42004-431B Page 8 of 9 Level Adjustments Channel 1 33-Ohm Volume Level - The 33-ohm volume level potentiometer, R11, adjusts the signal level out to the 33-ohm line. Channel 1 33-Ohm Balance - The 33-ohm balance potentiometer, R46, adjusts the sidetone present on the 33-ohm side of the interface. Channel 1 600-Ohm Volume Level - The 600-ohm volume level potentiometer, R37, adjusts the signal level out to the 600-ohm line. Channel 1 600-Ohm Balance - The 600-ohm balance potentiometer, R34, adjusts the sidetone present on the 600-ohm side of the interface. Channel 2 33-Ohm Volume Level - The 33-ohm volume level potentiometer, R57, adjusts the signal level out to the 33-ohm line. Channel 2 33-Ohm Balance - The 33-ohm balance potentiometer, R79, adjusts the sidetone present on the 33-ohm side of the interface. It adjusts the amount of audio that is transmitted to the 33-ohm line from being heard on the 600-ohm line. Channel 2 600-Ohm Volume Level - The 600-ohm volume level potentiometer, R81, adjusts the signal level out to the 600-ohm line. Channel 2 600-Ohm Balance - The 600-ohm balance potentiometer, R74, adjusts the sidetone present on the 600-ohm side of the interface. Bi-directional Alignment The unit is factory aligned for ideal conditions, such as the 33-ohm line terminated at the unit. For areas where this is not the case, adjustments may be required to improve audio and sidetone levels. For sidetone adjustments, the unit should be aligned as two one-way systems and then connected as the two-way system. The following is the procedure to align the sidetone in each direction. 1. Remove the jumper P7 for Channel 1 or P13 for Channel 2 to deactivate the 600-ohm output. This will set up the unit for a 33-ohm output only. 2. Apply a signal to the 600-ohm input and adjust the 33-ohm volume level potentiometer, R11 for Channel 1 or R57 for Channel 2, for the desired output level on the 33-ohm side. 3. Monitor the signal level at pin 1 of P7 for Channel 1 or P13 for Channel 2. In the unit it is located at the top of the header. This is the sidetone signal level. Adjust the 33-ohm balance potentiometer, R46 for Channel 1 or R79 for Channel 2 for minimal signal level at pin 1. 4. Install the jumper P7 for Channel 1 or P13 for Channel 2 to activate the 600-ohm output and fine tune the 33-ohm volume level potentiometer, R11 for Channel 1 or R57 for Channel 2, for desired output level side. 5. Remove the jumper P3 for Channel 1 or P9 for Channel 2 to deactivate the 600-ohm output. This will set up the unit for a 33-ohm output only. 6. Apply a signal to the 33-ohm input and adjust the 600-ohm volume level potentiometer, R37 for Channel 1 or R81 for Channel 2, for the desired output level on the 33-ohm side. f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 370-301 Dual Channel 600 to 30-Ohm Converter Pub. 42004-431B Page 9 of 9 7. Monitor the signal level at pin 1 of the header for the 33-ohm activation. In the unit it is located at the top of the header. This is the sidetone signal level. Adjust the 600-ohm balance potentiometer for minimal signal level at pin 1. 8. Install the jumper P3 for Channel 1 or P9 for Channel 2 to activate the 33-ohm output and fine tune the 600-ohm volume level potentiometer, R37 for Channel 1 or R81 for Channel 2, for desired output level side. Attaching the Front Panel After all adjustments have been completed, place the front cover on the rear enclosure, being careful not to pinch any cables. Secure the front cover using the four screws and washers provided. Torque the screws to 10–12 in-lbs (1.13–1.36 n-m). Specifications AC/DC Input AC Power Supply Input voltage ...................................................................................... 120/230 V ac (nominal), 50/60 Hz Power factor @ nominal 120 V ac .................................................................................................... 0.98 Current draw @ nominal 120 V ac ............................................................................................. 100 mA DC Power Supply Input voltage .......................................................................................................................... 12–24 V dc Current draw @ nominal 12 V dc ............................................................................................... 175 mA Current draw @ nominal 24 V dc ............................................................................................... 130 mA 33-Ohm Audio Output Output with 1 Vrms at 600-ohm input ................................................................... 1.5 Vrms, factory aligned 2.3 Vrms maximum Distortion .............................................................................................................................. <1.5% @ 1 kHz Sidetone ...................................................................................................................... -30 dB factory aligned VOX threshold ........................................................................................................................... >150 mVrms VOX activation time ............................................................................................................ <50 milliseconds VOX holdtime............................................................................................................................... >4 seconds 600-Ohm Audio Output Output with 1.5 Vrms at 33-ohm input .................................................................. 1.0 Vrms, factory aligned 1.3 Vrms maximum Distortion .............................................................................................................................. <1.0% @ 1 kHz Sidetone ...................................................................................................................... -30 dB factory aligned VOX threshold ........................................................................................................................... >200 mVrms VOX activation time ............................................................................................................ <50 milliseconds VOX holdtime............................................................................................................................ >3.5 seconds Relay Outputs Maximum load ........................................................................................................................ 2 A @ 30 V dc Dimensions ..................................................... 14.50 H 8.31 5.26 D inches (368.3 211.1 133.6 mm) Shipping weight ................................................................................................................. 10.5 lbs. (4.76 kg) Net weight ............................................................................................................................ 9.5 lbs. (4.31 kg) f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc 02/15 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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