Hubbell 670-801-UL User's Manual
Contents
1. the minimum trip level for detecting a page in progress Default setting 0 44 Vpeak e Pass Level for Speaker Amp HC the minimum expected test tone voltage level for supervision of the speaker amplifier Default setting 0 2 Vpeak e Pass Level for Speaker Wire HC the minimum expected ambient level for supervision of the speaker wire Default setting 35 dB SPL e Smart Party Line EOL enables or disables the station as an end of line device for supervision of party line 1 for a station configured either as a Smart Handset Dual Party Select device or a Smart Handset Party Select device Default setting disabled e SmartSeries Station RTU Monitored Input Process selects the input mode for each IDC Default setting disabled e SmartSeries Station RTU Power Relay Process selects the relay group and zone associated with an indicating appliance circuit LAC Default setting disabled e Speaker Amplifier Clip Level the maximum output level of the speaker amplifier Default setting 2 16 Vpeak e System VLC Control enables or disables VLC Mode Default setting disabled e System VLC Group the group number for VLC operation Default setting 0 e VLC Page Priority the station s incoming Page Priority Level Default setting 0 The following standard programmable features are also accessible from the User Level Adjustment control on the front panel e User Minimum Page Output Level or Minimum Level the minimum page2. being adjusted into VLC mode 2 Turn USER ADJ fully counterclockwise and wait to hear two beeps over the amplifier s associated speaker This switches the amplifier into the VLC Level adjustment mode 3 Turn USER ADJ clockwise to the desired speaker volume level The amplifier remains in the VLC Level adjustment mode for as long as USER ADJ is varying After USER ADJ has remained stable for five seconds the amplifier returns to its normal operating mode Intemal Adjustments This assembly includes additional internal control the FSK Transmit Level which affects system performance Therefore only qualified GAI Tronics personnel with the appropriate test equipment should make any adjustments The function and location are included for information only Tampering with this control may void your warranty FSK Transmit Level The control labeled XMIT LEVEL adjusts the level of the frequency shift keying FSK signal transmitted to the page line Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 12 of 15 Maintenance In order to verify and ensure explosion proof integrity perform regular preventive maintenance and inspection checks on the GAI Tronics explosion proof stations The GAI Tronics Field Service Department can formulate a service contract to suit specific preventive maintenance needs N CAUTION N R
3. 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 8 of 15 UL Version 1 Install the conduits for system and speaker cable and make connection to the enclosure External conduits in Class I Groups C and D must have gas seals located not more than 18 inches 457mm from the amplifier enclosure External conduits in Class II and Class III areas must also have seals if the conduit is not dust tight 2 Feedthe wiring through the conduit and into the enclosure 3 Make connections by following the wire colors as illustrated in Figure 7 The wire colors correspond to GAI Tronics 60029 and 60038 Series system cable and to 60021 for speaker cable 4 Connect the wires carefully and completely to the compression terminal block An improper termination may result in diminished station performance 5 Install the amplifier by aligning the 16 pin connector to the enclosure socket and pushing straight in Install the four screws retained previously 6 Lift the front cover and inspect the gasket and mating machined rims for nicks scratches or other damage that could compromise the integrity of the flame path 7 Secure the front cover in place using the bolts provided Tighten the bolts alternately with bolts that are diagonally opposite to ensure that the cover is evenly sealed NOTE If acoustical feedback occurs between the speaker associated with the amplifier and the handset on a nearby station t
4. 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 15 of 15 Replacement Parts 751 801 Amplifier 12555 001 FSK PCBA Kit 12557 001 Base 16 PCBA Kit 12558 001 Bias Power Supply PCBA Kit 12530 001 Transformer Connector Subassembly Reference Material Reference to Assembly Model Drawings Published by Title GAI Tronics Ref No GAI Tronics SmartSeries Amplifier Enclosure Outline drawing 222 143 GAI Tronics SmartSeries Plug in Amplifier Outline drawing 71846 s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004 61512 doc 6 97 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
5. Pub 42004 615L2 i GAI TRONICS CORPORATION A HUBBELL COMPANY Model 670 801 EX and 670 801 UL SmartSeries Amplifiers for CENELEC Zone 1 and UL Div 1 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 Introduction The assembly described in this manual is an explosion proof enclosure and intelligent speaker amplifier designed to be installed in hazardous areas where combustible gases exist or may exist The extra thick cast aluminum enclosure while not gas tight is designed to withstand repeated internal explosions without expelling gases hot enough to ignite the external atmosphere This is accomplished through the use of a precision machined enclosure opening flame path that cools the exiting gases to a temperature below the flash point of the external explosive atmosphere How to Use the Assembly Model Application The hazardous area SmartSeries amplifieris designed to provide clear communications even in high noise areas where explosive atm
6. ad PSK frequency range cede Br de hn O E Anti Adin Aelia DER CEE E EE ere ETE erete ECEE ERR ERE EEEn 30 33 kHz SmartVolume Dynamic range low sain 6 eiie e e hash ee Ue sd sesh LU ba PP e e Re anea ebei 62 to 100 dBA SPL Frequency characteristics eene nere 630 Hz LPF 6 dB octave Offset above ambient User Level Adjust esses eene eene 0 to 25 dB Minimum user adjust ette etre E E E EE E E EEEE eR eR RR rre RR Off 85 to 125 dBA SPL SpeakerMire Monitor Dynamic range high gain nennen nennen enne rennen enne 27 to 65 dB SPL Frequency characteristics sseeeeesseeeeeeeeeeee eene 630 Hz LPF 6 dB octave Fault setpoint iiiter rd eate 35 dB SPL adjustable via configuration Note The measured SPL varies for each speaker type Recommended environment eeeesseesessseeeeeeeeeeeee eene ennnn Greater than 50 dB SPL Mechanical DIMENSIONS d RRRSBSBSBSBU S 14 4 H x 14 4 W x 7 83 D inches 367 x 367 x 199 mm overall Enclosure material 1 1 25 obe eer Et e e o t eH Mo Ete LAE Rene da LM25TF Epoxy Internal controls ui e labios dees ttt i E EP HE E RUE Ro RE EP Rt E EE PEE Eee EU bees RR Nee LEHRER Line level Environmental Operating and storage temperature range sseeeeeeee 4 F to 151 F 20 C to 4 66 C HUMIC inthe onan onan eam teat eh am BERGE 95 non condensing s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004
7. aner and compressed air 6 Strip wires back to clean copper before reconnections 7 Reinstall the amplifier and enclosure cover Reapply the power Troubleshooting The following suggestions are provided to aid a technician in troubleshooting Feedback during page of nearby Use the muting feature in the amplifier enclosure at the terminal handset station blocks Crosstalk One or more system cable pairs may be improperly terminated Visually inspect the system cable for accidental crossing of cable pairs or grounds Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 13 of 15 Software Configuration The unit has the following versions of software PCBA Device Part Number Base 16 PCBA U2 50086 014 FSK modem PCBA Ul 49023 030 The SmartSeries Amplifier has software on U2 of the Base 16 PCBA and on U1 of the FSK Modem PCBA This software provides the following standard programmable features accessible from the SST Configuration screen when the station is in an ADVANCE system e Page Priority VLC Mode determines the condition for setting the speaker amplifier output to the User Page Priority VLC Volume Level Control Output Level by comparing the incoming page s Page Priority Level with the station s Page Priority Level VLC Page Priority Default setting disabled e Page Trip Level for Speaker Amplifier
8. e 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 technician
9. emove power from the enclosure before performing any maintenance Use the following procedures to ensure reliable operation of your equipment Remove power from the enclosure 2 Unbolt the cover Remove the amplifier from the enclosure 3 Visually check the interior of the enclosure for signs of contamination Contamination inside the enclosure could mean that the conduit seals or cable gland seals have been compromised 4 Ensure the gasket and hardware are in place and in good condition Reinstall the amplifier and enclosure cover Restore power to the unit In certain circumstances it may be necessary to re terminate some or all of the enclosures in a system When this is done strip the wires back to clean copper and make wire connections to each terminal If contaminants from the plant atmosphere have entered the enclosure clean the interior Often a solvent contact cleaner is not strong enough to wash away the buildup If this occurs try the following steps 1 Disconnect power from the enclosure 2 Disconnect all wires from the terminal strip inside the box 3 Spray the interior of the enclosure with a heavy duty surfactant type water based industrial cleaner Heavy concentrations of contaminants may be scrubbed with a scrub pad or a soft brush 4 Rinse the interior of the box with a water spray and blow out any excess water using compressed air 5 Apply a coating of water displacement solution followed by contact cle
10. ernal speaker and J3 connects optional external devices s_eng gtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 6 of 15 Interfaces The unit interfaces to the multi party cable and to the external loudspeaker and auxiliary devices via P1 a 16 pin connector o mar femea o fee meme s SPKRLI6 pener dom SPARC Spenter common Ce AEN rewa 6 en acha The P1 connections for the multi party cable are separated from the speaker connections within the enclosure s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 7 of 15 Installation Before installing SmartSeries equipment design the system layout taking into consideration personnel safety operational function and convenience and power cable length In general for 115 V ac systems the total power cable length should not exceed 1 mile 1 6 km but the length of cable between the stations is not a critical factor However it is a good practice to run a separate power feed to each station located in hazardous areas With a separate feed individual stations can be de energized for service or maintenance without affecting the power supply and operation of the other stations in the hazardous area Mounting NOTE The mounting
11. 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 GAI Tronics 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 applicabl
12. he speaker can be muted by moving the violet wire on the enclosure on TB1 to terminal 7 EX Version Follow the mounting instructions described above 1 Make up cable core ends as required for connection to the terminal blocks in the enclosure base 2 Dismantle the outer parts of the 25mm Ex d cable gland s for the system cable and 16mm Ex d cable gland for the speaker cable and thread them onto the cable s in the correct order 3 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 4 Before tightening of the gland assembly check that the slack in the cable inside the enclosure is adequate but not excessive 5 Connect cable cores to terminals following the wire colors as illustrated in Figure 7 The wire colors correspond to GAI Tronics 60071 and 60072 Series system cable and to 60070 for speaker cable Connect the wires carefully and completely to the compression terminal block An improper termination may result in diminished station performance 6 Install the amplifier by aligning the 16 pin connector to the enclosure socket and pushing straight in Install the four screws retained previously 7 Liftthe front cover and inspect the gasket and machined rim for nicks scratches or other damage that could compromise the integrity of the flame path seal 8 Secure the front cover in place using the bolts provided Tighten the bo
13. lts alternately with bolts that are diagonally opposite to ensure that the cover is evenly sealed Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Pub 42004 615L2 Page 9 of 15 NOTE If acoustical feedback occurs between the speaker associated with the amplifier and the handset on a nearby station the speaker can be muted by moving the violet wire on the enclosure on TB1 to terminal 7 3 3 WHT BLK RED BLU WHT GRY ORG RED amp 74 B wx c4 3 2 JI 16 15 14 13 12 11 10 9 BLK GRN YEL VIO TAN RED BLK WHT BLU RED E PE P GRN YEL 2 34 77 TB1 BL 1 A C 120 V 50 60 Hz WHT 2 N c GRN YEL 3 GND BLK WHT 4 c GRY 5 8 FSPKR WHT BLK 6 16 ORG 7 MUTE VIO CT SEE NOTE RED BLU 4 8 PAGE BLU RED 9 u RED 104H Ls S TAN RED 4 1102 7 12 13 SPARE 14 15 J TB2 Figure 7 Wiring Detail s_eng gtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 10 of 15 Operation This unit amplifies page audio for br
14. mum Level adjustment sets the minimum output of the speaker amplifier The amplifier can be set from minimum to full output 12 watts into 8 ohms in 100 discrete steps or no output The factory default is step 20 providing 4 watts To adjust the Minimum Level perform the following steps 1 Turn USER ADJ fully counterclockwise and wait to hear a single beep over the associated speaker This switches the speaker amplifier into the Minimum Level adjustment mode If there is an audio signal on the page line when the amplifier enters this mode you hear it over the associated speaker Otherwise you hear an amplifier generated test tone 2 Turn USER ADJ clockwise to the desired minimum speaker volume level The amplifier remains in the Minimum Level adjustment mode for as long as USER ADJ is varying After USER ADJ has remained stable for five seconds the amplifier returns to its normal operating mode Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 11 of 15 Offset Level The Offset Level adjustment causes the speaker amplifier to maintain a set difference between the ambient level and the speaker output level The SmartVolume feature measures the ambient noise at the associated speaker and adds the Offset Level to set the speaker amplifier gain This keeps page announcements louder than the ambient noise The Off
15. oadcast over external speaker s Adjustments N CAUTION A It is necessary to open the explosion proof enclosure to make adjustments Make adjustments only when the conditions at your facility are such that no explosive atmospheres can be present This assembly includes one control that permits adjustments to be made while the assembly is mounted in its enclosure but with the bolted cover removed In addition there are several internal controls that are accessible only by removing the assembly from its enclosure There is a user adjustment for setting the speaker amplifier gain for the SmartVolume feature which has three components Minimum Level Offset Level and VLC Level Although they typically require no adjustments these volume levels can be set with the User Level Adjustment control labeled USER ADJ Use a small flat blade screwdriver with an insulated shaft at least 4 inches long to make adjustments To access the USER ADJ control perform the following steps 1 Unbolt and remove the front enclosure cover revealing the speaker amplifier 2 Loosen do not remove the two screws that secure the nameplate 3 Pivot the nameplate counterclockwise exposing the access hole A guide behind the access hole helps direct the screwdriver to the USER ADJ control 4 When you are done with the adjustment pivot the nameplate clockwise into position then tighten the two screws Re install the bolted cover Minimum Level The Mini
16. odem PCBA fixed to the Base 16 PCBA s_eng gtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Page 4 of 15 m 3 56 MAX 90 42 SU e GASKET CHASSIS Figure 4 SmartSeries Amplifier Side View Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 5 of 15 Block Diagram MULTI PARTY SYSTEM SEPARATE BASE 16 CABLE ENCLOSURE PCBA EXTERNAL SPEAKER SPEAKER TRANSFORMER m EXTERNAL BIAS POWER SUPPLY PCBA Figure 5 Model 670 801 Block Diagram As shown on Figure 5 P1 is the 16 pin male connector located on the back of the Base 16 PCBA It plugs into the socket located inside the cast aluminum enclosure The socket provides connection to the multi party cable containing the page party lines and ac power The Base 16 PCBA conducts ac power to the Bias Power Supply PCBA through connector J6 and receives 5 V dc and 15 V dc in return The Base 16 PCBA uses the bias supplies and also passes them as well as control monitoring and line signals to the FSK Modem PCBA via J1 a 24 pin stacking connector Connector J2 on the Base 16 PCBA connects the speaker transformer for the station s ext
17. ospheres exist or may exist The Model 670 801 EX is BASEEFA approved to CENELEC Standards Ex dib for Zone 1 Group IIC T5 The Model 670 801 UL is approved by Underwriters Laboratories for e Class 1 Div 1 Groups C and D e Class IL Div 1 Groups E F and G e Class III Div 1 The intelligent SmartSeries amplifier is designed for use on the GAI Tronics single party or multi party system cable It includes micro controllers that are programmed to e Receive and send data messages on the system cable e Measure ambient noise and adjust speaker level e Monitor and control optional external equipment GAI Tronics Corporation P O Box 1060 Reading PA 19607 1060 USA 610 777 1374 W 800 492 1212 W Fax 610 796 5954 VISIT WWW GAI TRONICS COM FOR PRODUCT LITERATURE AND MANUALS Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 2 of 15 Hardware Configuration The exterior view of the cast aluminum explosion proof enclosure is shown in Figure 1 below TE Figure 1 Model 670 801 EX UL SmartSeries Amplifier s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 3 of 15 Extemal The enclosure and cover are fabricated from thick aluminum castings The cover and the enclosure mate at machined rims to form the flame path seal The c
18. output level of the speaker amplifier Default setting 4 watts e User Offset Added to Ambient or Offset Level the amount of gain added to the ambient level so that an incoming page is not lost in the noise Default setting 9 dB e User Page Priority VLC Output Level or VLC Level the page output level of the speaker amplifier when the station is in VLC Mode Default setting 1 watt Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Pub 42004 615L2 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Page 14 of 15 Specifications Electrical MOltage x Mo e LIRE 90 to 140 V ac 120 V ac nominal 50 60 Hz Power consumed Zero maximum signal 12 watts 15 VA 10 5 watts 53 VA 34 watts Speaker Amplifier Output oun cone oat Deer ona tenu 12 watts minimum with nominal supply voltage Output limiter 7 ieu 2 16 Vpeak adjustable via configuration Voltage Gain wasn fate eis ees eee eke Ake eee eee esis 26 dB maximum adjustable Frequency Responses esas nane referti 575 4500 Hz 0 3 dB ref to 1 kHz DUAStOFLOHS rone eg 1 max THD 1 kHz 12 watts Input Impedance sitet einant eseina a o e eni eeke Ekat 50 k ohms nominal without FSK modem 16 k ohms nominal with FSK modem Audio input from line esee 1 5 Vrms nominal depends on distance from 33 ohm FSK Modem FSK output to line RROBEBROB UBBBREBBBHBEBBODL RE 0 7 Vrms 2 Vp p into 33 ohm lo
19. over is secured to the enclosure with bolts around the perimeter The enclosure entries are as follows The Model 670 801 EX cable gland entries are shown in Figure 2 On the base Three M25 entries two fitted with plugs and one M16 entry F M25 ENTRIES A x 1 OFF M16 ENTRY BOTTOM VIEW 0 6 16 1 9 48 INCHES MM Figure 2 Model 670 801 EX Cable Gland Entries The Model 670 801 UL conduit entries are shown in Figure 3 On the top One 14 inch NPT entry fitted with a plug and one 34 inch NPT entry On the base Two threaded 1 inch NPT entries one fitted with plug TOP VIEW 1 OFF 1 1 2 NPT ENTRY 35 4 NPT ENTRY 1 1 2 NPT ENTRIES BOTTOM VIEW INCHES MM Figure 3 Model 670 801 UL Top and Bottom Views NOTE Ensure any unused openings are sealed with proper fittings per local standards Ws englgtcproddocs standard ioms current release 2004 instr manuals 42004 61512 doc 6 97 Model 670 801 EX and 670 801 UL SmartSeries Amplifiers Intemal The SmartSeries amplifier contains the following components Chassis Bias Power Supply sub assembly fixed to the front panel Speaker transformer fixed at the top of the chassis Base 16 printed circuit board assembly PCBA with a plug at the top pointing to the rear FSK M
20. s 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
21. set Level can be set from 0 dB the speaker output level is the same as the ambient level to 49 dB A speaker should be set for 6 to 10 dB louder than the ambient noise so the factory default is 9 dB To adjust the Offset Level perform the following steps NOTE There must be enough ambient noise for the amplifier to sense The exact level depends upon the speaker type but it is typically approximately 80 dB 1 Turn USER ADJ fully clockwise and wait to hear two beeps over the associated speaker This switches the amplifier into the Offset Level adjustment mode If there is an audio signal on the page line when the amplifier enters this mode you hear it over the speaker Otherwise you hear an amplifier generated test tone 2 Turn USER ADJ counterclockwise to the desired speaker volume level The amplifier remains in the Offset Level adjustment mode for as long as USER ADJ is varying After USER ADJ has remained stable for five seconds the amplifier returns to its normal operating mode VLC Level The VLC Level adjustment sets the speaker amplifier gain for the Page Priority VLC feature to provide an emergency output level The amplifier can be set from minimum to full output 12 watts into 8 ohms in 100 discrete steps or to no output The factory default is step 10 but the System VLC Control feature is disabled To adjust the VLC Level perform the following steps 1 Have an assistant page from a station that forces the amplifier
22. surface must be able to support 55 Ibs 25 kg 1 Remove the front panel Allow the front panel 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 front panel flame path 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 137cm Use standard 1 2 inch socket head cap screws or M12 bolts to secure the enclosure to a flat mounting surface See Figure 6 below for mounting hole dimensions Figure 6 Shows mounting holes with dimensions 3 After the enclosure is securely mounted remove the plug in amplifier e Remove the four screws that secure the amplifier to the standoffs and retain e Pull the amplifier straight toward you to disengage the 16 pin connector from the enclosure e Set the amplifier aside in a safe place while completing the installation NOTE The following instructions are provided to ensure compliance with the appropriate approval standards Select the version that applies to the equipment you have purchased based on approval agency jurisdiction s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004
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