Related Manuals for Clear-Com PS-704
Summary of Contents for Clear-Com PS-704
- Page 1 CLEAR-COM ENCORE PS-704 FOUR-CHANNEL POWER SUPPLY I N S T R U C T I O N M A N U A L...
- Page 2 Room 1806, Hua Bin Building No. 8 Yong An Dong Li Jian Guo Men Wai Ave Chao Yang District Beijing, P.R. China 100022 ® Clear-Com, CellCom/FreeSpeak and the Clear-Com Communication Systems logo are registered trademarks of The Vitec Group plc.
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Page 3: Table Of Contents
PS-704 Overall Description........ - Page 4 LIMITED WARRANTY ........6-I Warranty Period..........6-i Technical Support .
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Page 5: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with dry cloth. 7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. - Page 6 Figure 1: Safety Symbols EMC AND SAFETY The PS-704 power supply meets all relevant CE, FCC, UL, and CSA specifications set out below: EN55103-1 Electromagnetic compatibility. Product family standard for audio, video, audio-visual, and entertainment lighting control apparatus for professional use.
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Page 7: Operation
In fact, many of our original beltpacks and main stations are still in daily use around the world. The PS-704 power supply is a powerful, yet user-friendly unit that can serve as the heart of a Clear-Com system. We recommend that you read through this manual completely to better understand the function of the PS-704 and how to optimize your system setup. -
Page 8: Description
Use of a switching power supply allows the PS-704 to operate with any AC line voltage from 100 volts to 240 volts AC at 50 Hz or 60 Hz. The metal chassis and extra-thick front panel with integral rack ears maintains legendary Clear-Com ruggedness. - Page 9 • LOW NOISE CIRCUITRY: The direct current outputs of the PS-704 contain very little hum and noise. The PS-704 does not contribute to audible noise in the remote stations and beltpacks. Note: Power supply lines connected together at remote stations will disable the individual channel short circuit protection feature.
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Page 10: Ps-704 Overall Description
LED will illuminate when the power is on. 2. OVERLOAD INDICATORS: The respective red LED for each channel (A, B, C, D) will illuminate if the PS-704 senses a short or overload on that channel. When the fault is removed, the PS-704 will automatically reset and the LED will go out. -
Page 11: Power Distribution And Short Circuit Protection
POWER DISTRIBUTION AND SHORT CIRCUIT PROTECTION Depending upon how many shorts or overloads a channel has experienced recently, the PS-704 will attempt to turn power on again within 0.5 to 20 seconds of automatically cutting off power to an overloaded channel. This allows momentary short or overload conditions to clear automatically. -
Page 12: Rear Panel Connectors
DC power to that line only and the red LED for that channel will be on. If a red LED is illuminated, the fault on that channel must be located and removed. The overload LED will go out and the PS-704’s automatic short reset circuitry will automatically bring the power back up on that channel when the fault is removed. -
Page 13: To Check Before Powering System
TO CHECK BEFORE POWERING SYSTEM Before you turn on the power: CHECK TERMINATION There should be one and only one termination for each channel in the system. This termination is usually set to on at the main station or power supply. To ascertain that only one termination is present on the channel, perform the following test: 1. - Page 14 2. Test for proper operation of call signaling. Activate the call signal on any belt pack or station. The call lights on all other stations on that channel should illuminate and then go out when the call button is released. 3.
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Page 15: Installation
10. Read the rest of this manual for further information. INSTALLATION Choose the location of the PS-704. The unit requires access to AC power. It should be located away from other equipment that generates excessive amounts of heat. The choice of location will also depend upon the wiring scheme (refer to the section “Wiring”). -
Page 16: Line Termination (Rear Panel)
If the PS-704 is the only power supply in the system (no other power supplies or powered main stations are in the system) the termination switch on each channel of the PS-704 should be switched to on. -
Page 17: Wiring
WIRING When considering how to wire an intercom system, several factors must be taken into account. These include the number of stations, the length of the cable runs and whether single or multiple channels are preferred. If multi-channel stations are connected with multi-pair cables, then crosstalk becomes an important issue. (Crosstalk is not a factor with single-channel systems or multi-channel systems where each channel is run on its own individual cable to single-channel remote stations.) While the physical considerations include ease of installation, type of... - Page 18 2. Hub or Star: Each remote station is wired directly back to the power supply or to a split line wired directly to the power supply. C hannel A C hannel A P S - 7 0 4 Figure 2-2: Hub or Star 2 - 4 P S - 7 0 4 F O U R - C H A N N E L P O W E R S U P P L Y...
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Page 19: Multi-Channel System
P S - 7 0 4 Figure 2-3: Multi-channel System In a multi-channel system where multiple channels are run from the PS-704 to multiple channel stations as in the following diagram, crosstalk can be an issue. This is because the channels will share a common ground at both ends of the cable run. -
Page 20: Crosstalk Considerations
Connect unused cable wires of a multi-pair cable to the pin #1 shield. If shielded multi-pair cables are used to connect multiple channels between the PS-704 and remote stations, the cables should be wired to maximize the number of ground connectors to minimize crosstalk. In the following cable wiring diagram, note that it is not necessary to run redundant power connectors on each channel to the remote station. -
Page 21: Intercom Cable Considerations
INTERCOM CABLE CONSIDERATIONS The Clear-Com intercom line is intended to run on one shielded cable pair per intercom channel. One conductor carries audio, the other conductor carries the DC power for remote stations. The shield serves as the ground return of the audio and power conductors. - Page 22 2 - 8 P S - 7 0 4 F O U R - C H A N N E L P O W E R S U P P L Y...
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Page 23: Maintenance
Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. PS-704 BLOCK DIAGRAM The following is a block diagram of the PS-704: PS-704 +30 VDC... -
Page 24: Troubleshooting Tips
TROUBLESHOOTING TIPS SYMPTOM CAUSE SOLUTION System does not operate. No No AC power to the PS-704. Check AC connection and cable. Plug power to the PS-704. Green into dependable AC source. power LED is not illuminated and no short LEDs are illuminated. - Page 25 SYMPTOM CAUSE SOLUTION Channel unterminated. Set the PS-704 termination switch for that channel to the on position. A headset extension cord was used. Headset extension cords are not recommended. Excessive crosstalk. High DC resistance in ground return. Use heavier cable; add additional conductor(s) to ground return.
- Page 26 3 - 4 P S - 7 0 4 F O U R - C H A N N E L P O W E R S U P P L Y...
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Page 27: Technical Specifications
TECHNICAL SPECIFICATIONS PS-704 FOUR-CHANNEL POWER SUPPLY dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS Program Line Input Maximum Level before Clipping >= 20dBu Input Impedance >= 5KΩ Frequency Response Program Input - Party Line 200 - 20KHz ± 3dB... - Page 28 Weight 6.16 lbs. (2.80 kg) Notice About Specifications While Clear-Com makes every attempt to maintain the accuracy of the information contained in its product manuals, that information is subject to change without notice. Performance specifications included in this manual are design-center specifications and are included for customer guidance and to facilitate system installation.
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Page 29: Glossary
Bridging, High Impedance (hi-Z): A method of connecting to an audio line (such as Clear-Com) without loading or taking appreciable power from that line. Simply stated, as you add more and more stations to the line, the volume remains constant. - Page 30 voices and instruments on stage. IFB (program interrupt) disconnects the audio source while the talk button on the main station is pushed. ISO: A private conversation path. An ISO channel allows one to simply push a button and transfer themselves and the person they wish to speak with to an isolated channel.
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Page 31: Limited Warranty
• UHF wireless intercom systems have a limited warranty of three years. • All other Clear-Com and Drake brand systems and products, including beltpacks, have a limited warranty of two years. The warranty starts at the time of the product’s original purchase. The warranty... -
Page 32: Warranty Repairs And Returns
such agreement. For more information, contact your authorized dealer, distributor, or sales representative. Instructions for reaching VGC’s User Support Centers are given below. Telephone for Europe, Middle East and Africa: +49 40 6688 4040 Telephone for the Americas and Asia: +1 510 337 6600 Email: vitec.support@AVC.de Once the standard warranty period has expired, the User Support Center will continue to provide telephone support if you have purchased an Extended... -
Page 33: Service Contract
years the warranty of any product offered with a standard two-year warranty. The total warranty period will not extend beyond five years. Any purchase of an extended warranty provides 24 x 7 customer support in addition to the warranty immediately upon purchase of the warranty extension. Note: VGC does not offer warranty extensions on UHF wireless intercom systems, or on any product with a 1-year or 90-day warranty. - Page 34 of customer furnished components resulting in damage to VGC provided product. This limited warranty is not transferable and cannot be enforced by anyone other than the original consumer purchaser. This warranty gives you specific legal rights and you may have other rights which vary from country to country.
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