PS-31 User Manual
Contents
1. FIGURE 1 PS 31 Front and Back View Status Indicators There is an audible alarm and a red FAULT indicator for current overload indication on any of the three channels An AUDIBLE ALERT switch on the front panel turns the alarm on or off but the FAULT indicator will continue to flash during current overload conditions There is also a green status indicator for each channel Each of these indicators will remain lit during normal operation but will turn off during a channel current overload condition Output current is automatically reduced during an overload and normal operation is restored when the overload is removed Input Power The PS31 is available in two versions one for 115 VAC operation and one for 230 VAC operation A simple internal modification changes the operating voltage for 100 VAC or 200 VAC A POWER on off switch is provided on the front panel Intercom Channel Connections Intercom channels are connected to the rear panel of the PS31 A variety of connector pin outs is provided to accommodate individual system requirements Impedance Selection The PS31 provides the required channel terminating impedance for each channel A 200 400 ohm IMPEDANCE SELECT switch for each channel is located on the rear panel These switches are set to 200 ohms for normal operation The 400 ohm setting permits two PS31 s to be coupled to double the DC capacity of the system Installation MECHANICAL INSTA2. 5 5X3 5 5 FIGURE 8 Final Assembly Model PS 31 30 b BA AAS AS SS DEC 71 BACK WAS FRONT x Tu ATE D GAN PIB AWG 4 LONG 0 s Li B E mo c mn 1 oo Lm OO HHHOO Qd die IMS 90 wa poc S Fe sis 7 ATEOS AA JB A ADD A DROP OF GLYPTOL TO SECURE THREADS POWER SWITCH FAST ON WIRES FROM J107 3108 AND 3109 ARE AS FOLLOWS RECEPTACLE REDAND BROLIN FORM A TWISTED FAR ORANGE AND YELLOW 4 PLACES FORM ATLASTED PAIR WIRES 4 LG 3 22 AUG A ADHERE AND ComPLETELY CoaT THERMAL CUTOUT To TRAUSFIEMER WITH THERMAL CoMfDUND FIGURE 9 Wiring Diagram Model PS 31 32 Specifications Channels Three Connectors Six XLR 3 type connectors 2 channel Three XLR 4 connectors three channel One XLR 3 type connector program input DC Output Voltage each channel 32 volts nominal Line Terminating Impedance each channel 200 ohms switchable to 400 ohms when operating two supplies in parallel Output Current Ratings per channel see also Figure 1 1 Max before fault indication 1 5 amps Sustained Overload 50 C ambient 2 0 amps Max before foldback limiting 2 5 amps Short circuit current 0 5 amps Startup current 0 5 amps Max Total Sustained Current 50 C ambient 2 0 amps Intercom Audio Level 2 volts pp nominal Head Room 6 dB minimum
3. CHANNEL DC OUTPUT FUSE REPLACEMENT To replace channel fuses F201 F301 F401 remove covers These fuses are located on the circuit board TEST PROCEDURES TEST EQUIPMENT e isolated variable voltage power transformer with voltage and current metering VARIAC POWERSTAT or equivalent e sine wave oscillator e An oscilloscope 15 megahertz minimum bandwidth e distortion analyzer HP331 through HP334 HP339 or equivalent e An AC voltmeter capable of reading volts dBm and dBu e Two DC voltmeters e Atest load see Figure 4 e capacitive load box see Figure 5 e program input cable see Figure 6 Two channel output cables see Figure 7 INITIAL INSPECTION Verify electrical orientation of power supply capacitors Verify proper wiring of transformer primary for local mains voltage Verify that the proper fuses are installed in the back panel fuse holder and on the printed circuit board Check that the transformer is securely mounted and that it is electrically isolated from the chassis resistance from chassis to transformer core should be greater than 10 kohms Check that the power supply capacitor is securely fastened Using an ohmmeter verify that the chassis is electrically connected to the grounding pin on the power connector less than 0 2 ohm POWER UP TEST 1 Setthe variable voltage power transformer to off and set the voltage to zero 12 ea gt LY DN 9 10 Plug the P
4. D601 D602 DIODE REC 1 AMP 1N4004 50745 005 Item Qty Des Description Part Number D207 D208 D209 D210 DIODE D307 ZENER 5 1 V 5 D308 gt _ 55 12 1N5231B ran D309 MOTOR D310 DIODES D407 INC D408 D409 D410 D201 DIODE ZENER 10 D301 56 3 V 5 86266011 D401 1N5240B D202 D299 DIODE 33 6 D302 ZENER 20 1061 5250 0305 V 5 OBT BAD 1N5240B D405 D203 DIODE 5s r D303 ZENER 36 1601 5365 V 5 OBT D403 1N5365B Q101 0201 XSTR 59 4 NPN 1602 5210 00 9301 2N5210 Q401 U101 IC U201 VOLTAGE 60 4 1603 0009 00 U301 REG LM317HVK ADJ REG 3 TERMINAL 61 1 0102 53290 000 LM317T IC 62 1 0103 CD4011UB 1603 4011 00 E 22 Electrical Parts Electrical Parts Ref Ref Item Qty Des Description Part Number Item Qty Des Description Part Number U202 1101 63 4 NONEM 53295 000 uis 0402 onry _ CONN 72 6 AUDIO 59892 001 TERMAL J105 CUT OUT 7106 64 1 S101 INST TOP 1914 0001 00 5 Rae LEV 0012 73 1 TE 2018 0012 00 SWIER EAC333 PWR ON OFF J107 CONNECT 65 1 S102 1912 0004 00 MARQUAR 74 3 OR FIN 5018 0906 99 Br AUDIO 1802 1123 J MALE men mus TOGGLE
5. 30vV 8 401 403 a 5 4 C216 0318 C4 18 228 8328 8428 NOT USED IN STANDARD CONFIGURATION 3 U201 U301 U401 LM3 ITHVK TRIM LEADS TO 25 BEFORE INSTALLATION 2 CAPACITANCE VALUES ARE SHOWN MICROFARADS VOLTS NAT DESIGNATORS LAST USED DESIGNATORS NOT USED 1 ALL RESISTORS ARE CARBON FILM 1 4 WATT lt 5 R123 R228 328 R428 R610 R1 04 R106 8172 C128 C218 C318 C418 C607 8209224 0112 0215 0315 0415 0602 R303 8324 08101 08201 05301 05401 24 yum C105 C108 C111 C112 C115 C116 C118 C 120 1103 C205 U103 U203 0303 U403 0601 C305 5106 5201 5301 5401 405 SCHEMATIC DIAGRAM 9101 0103 0104 0107 0108 51 0213 POWER SUPPLY PS 31 F105 0313 E172 E203 E303 E403 0413 102 104 141 160 165 168 103 NOTES UNLESS OTHERWISE SPECIFIED FIGURE 7 Schematic Diagram Power Supply Model PS 31 page 2 29 5 ITEMS INDICATED ARE NOT INSTALLED AT THIS LEVEL 4 C218 C318 C418 R228 R328 amp R428 ANDARD CONFIGURATION 3 INSTALL LED S AND AUDIBLE ALERT AFTER INSTALLING BRACKET 2 APPLY THERMAL GREASE BETWEEN MICA INSULATORS ITEM 110 AND HEAT SINK ITEM 112 1 1202 U302 A U402 LEADS MUST BE CUT DOWN TO 425 010 INSTALLATION in A D C CL ORO uil O E ERN NE TO WN HLE Teen iun 55 Hil Em HRO MOSES 70 vii m HEN OOUIID Eb dun QUU E 2 Woo o AR A BU
6. DISC RAD 52157 330 100PF 50V C109 C110 C113 C114 CAP CER 35 8 CI2s DISC RAD 1510 R103 2R C215 C315 C415 C213 CER DISC C313 E E 36 3 0 1UE SO0V 1510 R104 2Q C413 20 C208 CAP CER 37 3 C308 DISC 52157 534 CAP CER MONO 38 1 C127 0 01 UE 1511 R103 2I 50V Item Qty ne Description Part Number Resistor 5 6 21 1 R107 KOhm 1 52154 263 4W 5 Resistor 10 20 1 R113 KOhm 1 52154 434 2W 590 Resistor Var Audio 23 1 R111 10 KOhm 1406 0032 00 Installed R220 R225 R320 Resistor 24 6 100 Ohm 1 54042 100 R420 R425 R201 R202 R301 Resistor 10 25 6 KOhm 1 54045 100 R401 R402 R607 Resistor 20 26 2 KOhm 1 54045 200 R608 4w 1 R208 Resistor 27 3 R308 226 KOhm 54044 226 R408 1 4W 1 R211 Resistor 28 3 R311 243 Ohm 1 54042 243 R411 W 1 R216 R223 R316 Resistor 29 6 42 2 KOhm 54045 422 R323 1 4w 1 R416 R423 R604 Resistor 30 2 60 4 KOhm 54045 604 R605 1 4w 1 20 Electrical Parts Electrical Parts Ref Ref Item Qty Des Description Part Number Item Qty Des Description Part Number C126 CAPACITO R C210 5 y B SIZE 45 1 c117 cbsio3u07 1513 R129 6K C216 BULK 5V4C RPE121
7. 3 75 1 J110 i 59893 001 66 1 s104 POS PC 1903 0051 00 D TOP ASSY PWR LEV 76 1 T101 TRANSFOR 9140 2623 00 SWITCH MER TOGGLE XFMR SPDT PC 7 1 T103 MOUSER 2306 0012 00 67 1 106 Mer angr 1903 0050 00 DUIS TOP ASSY FUSE LEV 78 1 T105 LITTELFUS 50547 161 SWITCH E 313003 DE F201 FUSE3 68 1 107 DPDT 1902 0001 00 AME SWCRFT 79 3 2047 910 5201 Sw AUDIBLE 69 3 301 7101SPYA 1903 0016 00 ALERT sao V2GE 80 1 LS 1 INST TOP 2605 0003 00 ASSY CONNECT LEV 70 1 n OR AMP 57762 508 640445 8 IE CONN 81 1 055 picaro 1805 0006 00 71 1 12 MOLEX 57708 102 R LAMP 26 60 4020 LED RED DS10 INST TOP 2 1 1801 0147 0R LEV 23 Electrical Parts Electrical Parts Item 83 Qty Ref Des DS20 1 DS30 1 DC40 1 Description LED GREEN INST TOP ASSY LEV Part Number 1801 0147 0G Item 100 Qty Ref Des Description CRIMP TERMINAL 10 Part Number 1005 0099 00 101 SOLDER LUG 4 1003 0004 00 84 PCI BARE PCB 9040 3225 00 85 FUSE CLIP LITTLEFUS E 102071 2802 0005 00 102 CABLE TIE PANDUIT PLT4S M 51709 002 86 SOCKET 14 PIN 53041 300 87 SOCKET 8 PIN 53041 302 103 WIRE 18 AWG TEFLON GREEN 2 LONG 2511 0110 00 88 INSULATO R MICA 50587 000 104 AR WIR
8. 1 4w 5 R123 R610 Resistor 1 6 1 R117 MOhm 1 52154 209 4W 5 Resistor 11 7 1 R121 KOhm 1 52154 256 4W 5 Resistor 1 3 8 1 R109 MOhm 1 52154 278 4W 5 Resistor 2 2 9 1 R119 KOhm 1 52154 273 4W 5 Item Qty Des Description Part Number R120 R210 R226 Resistor 22 10 7 R310 KOhm 1 52154 249 R410 R426 Resistor 2 2 11 1 R116 MOhm 1 52154 201 AW 5 R108 Resistor 12 2 240 Ohm 1 52154 296 R204 Resistor 2 7 13 3 R304 Ohm 1 4W 52154 343 R404 5 R227 Resistor 3 3 14 3 R327 KOhm 1W 52154 623 R427 5 R205 Resistor 3 6 15 3 R305 KOhm 1 52154 268 R207 Resistor 16 3 R307 390 Ohm 1 52154 291 R222 Resistor 17 3 R322 470 Ohm 1 52154 289 Resistor 4 7 18 1 R114 KOhm 1 52154 265 AW 5 Resistor 47 19 1 R118 KOhm 1 52154 241 AW 5 R212 R213 R312 Resistor 47 20 7 R313 Ohm 1 4W 52154 313 R412 5 R413 R601 19 Electrical Parts Electrical Parts Item Qty PE Description Part Number R214 R215 R314 Resistor 31 6 47 5 KOhm 54045 475 R315 1 4w 1 R414 R415 R219 R221 R319 Resistor 32 6 WW 2 Ohm 1404 02 0 51 R321 SW 5 R419 R421 CAP CER 33 1 C607 DISC RAD 52157 502 10pF 50V CAP CER 34 1 C602
9. 3 THEORY OF OPERATION GENERAL The PS31 electronic circuits include an AC to DC converter an impedance generator for each channel a program insertion amplifier and display and diagnostics circuits Figure 3 on page 9 The following paragraphs describe these circuits For schematic reference see drawing SD3225 in Chapter 7 AC TO DC CONVERSION Transformer T101 steps down the AC mains voltage to 33 volts rms Diodes D101 D104 rectify this voltage and capacitor C117 filters out the AC component leaving about 45 50 volts unregulated DC This raw DC voltage feeds the impedance generators through fuses F201 F301 and F401 and regulator U101 U101 provides regulated 30 volts DC This voltage is supplied to the impedance generators to the program insertion amplifier and to U102 Diodes D109 and D110 protect U101 Resistors R107 and R108 establish the output voltage reference of 30 volts DC Capacitor C121 reduces the amount of ripple on the 30 volts DC and C122 provides decoupling U102 provides regulated 7 5 volts DC This voltage is used as a reference level by the program insertion amplifier It also powers the display circuits Diodes D111 and D112 protect U102 Resistors R109 and R110 establish the output voltage reference of 7 5 volts Capacitor C123 reduces the amount of ripple on the 7 5 volts DC and C124 filters the output IMPEDANCE GENERATOR There is a separate impedance generator for each channel The impedance g
10. ENG DES Soit Sor PR Eco ANG F201 202 F205 WAS 3 AST ACTING CHNG SHT 2 ECD 54582 ON Tide 8 0 WAS CANGSS 5034 209 SOLFI WAS AMP CIOG WAS 0047 KV 1653 167 toe co i n BEBE HE 22 0 am 1 4004 sx PROGRAM 1 cso7 LEVEL 60 sr O Asos 2 3 OUTPUT PROGRAM 1 CHANNEL ASSIGN 1 THERMAL BREAKER 75 C OPENING TEMPERATURE THERMALLY ATTACHED TO TRANSFORMER 1101 144004 NOTES SPECIFICALLY FOR PAGE 1 FOR GENERAL NOTES SEE PAGE 2 60 4K 21 20 0K 21 PROGRAM INSERTION AMP CIRCUIT SCHEMATIC DIAGRAM POWER SUPPLY PS 31 FIGURE 6 Schematic Diagram Power Supply Model PS 31 page 1 28 as ow CHANNEL 1 0214 CHANNEL 1 DC INPUT POWERED OUTPUT 22 50 f 1N52318 152318 ims3658 5 1 25 5 1 25 3v 15 100 25 w 8205 2 R212 42 2K 21 05201 R222 5291 452408 P D210 1952318 S 1V 25 car 22 50 ELECTROLYTICN 1 2 5532 Q101 2N5210 C207 DUAL JES 35 4000 201 R215 v IMPEDANCE 3106 ALARM SWITCH 47 521 47 5K 21 REAR PANEL 1 50 MONO ALERT 8 rd R22 AUDIBLE CHANNEL 2 8391 8326 c302 C918 0301 0315 CMANNEL 2 DS 301 CHANNEL 2 DC INPUT Ser POWERED OUTPUT U103 CD 4011 30V E301 303 CHANNEL 3 8401 8428 C402 C418 CMANNEL 3 DS 40 CMANNEL 3 DC INPUT U401 U 403 POWERED OUTPUT i 401
11. channel 1 and ground of the audio only output cable to the distortion analyzer input and to the AC voltmeter Connect the program input cable to the PS31 PROGRAM INPUT J110 and to the sine wave oscillator On the PS31 set the PROGRAM CHANNEL ASSIGN switch to channel 1 Turn the P531 PROGRAM LEVEL control fully CCW minimum level Set the sine wave oscillator for 1 kilohertz 0 10 volt rms at the PROGRAM INPUT of the PS31 Observe the DC output voltage on DC voltmeter 1 It should be between 31 0 and 32 5 volts DC Set the output current adjustment control on the test load so that the output current is 0 50 amperes 0 5 volts at DC voltmeter 2 The output voltage at voltmeter 1 should drop by 0 5 volts or less Adjust the PS31 PROGRAM LEVEL control fully CW maximum level The AC voltage should be 1 8 volts rms Adjust the PROGRAM LEVEL control until the AC voltmeter reads 1 0 volt rms The waveform on the scope should be a sine wave with no hum or distortion Set the capacitive load box switch to 100 pF The waveform on the scope should remain unaffected Repeat this step for all the positions of the switch The only noticeable effect should be waveform attenuation with the higher capacitance values Set the capacitive load to OFF Set the oscillator frequency to 10 kilohertz the oscillator level should remain constant The AC voltage should read between 0 79 and 1 0 volts rms Set the oscillator frequency to 100 hertz the oscilla
12. m Chec Plug power Fuse back panel F105 No Output Voltage Selection amp No Excessive transformer temperature Lights thermal cut out will self reset after a cooling period Raw DC supply voltage should be 45 50 volts T Input Connections Program Input LEVEL control CHANNEL ASSIGN switch Input Connections Intercom cable routing too close to AC lights etc User station too close to a power Hum transformer PS31 common lead connected to a humming chassis ground someplace Mains voltage wiring incorrect Short on intercom channel Channel overloaded Fault Brown out on mains indicator Voltage selection is set wrong ON Brown fuse on PCB F201 F301 F401 DC voltage output 32 volts nominal Sras OK Check for AC on RTS line due to YANO faulty power line wirin Output 8 Input connections Distorted PROGRAM LEVEL control Sound Termination DC line voltage 15 16 CHAPTER 5 REPLACEMENT PARTS WHERE TO OBTAIN PARTS Parts may be obtained directly from RTS at Telex RTS Systems Attn Factory Service 1930 West 15 Street Blue Earth MN 56013 Phone 1 507 526 3205 Toll Free 1 800 218 2412 17 MECHANICAL PARTS Reference AS3233 Drawing Mechanical Parts Item No Qty Description RTS Part No 1 1 Front Panel Chassis 9090 3232 00 pt I ee 5 version p ANS Iu 9086
13. 3598 00 version Printed Circuit Board Assy Ref l Section 6 3 for E electrical parts 4 2 Top Bottom Cover 9030 3230 00 Transformer 5 4 Bracket 9110 2629 00 Power Transformer 6 1 TI01 9140 2623 00 Washer 6 7 8 Shoulder Nylon 1006 0017 00 10 16 Screw 4 40 X 3 8 1008 4035 00 Screw 6 32 X 1 4 11 8 Pan Head Phil 1008 6038 00 Screw 6 32 X 3 8 12 4 Pan Head Phil 1008 6013 00 Screw 6 32 X 2 13 4 Pan Head Phil 1008 8036 00 Screw 8 32 X 3 8 14 8 Pan Head Phil 1008 8022 00 Washer Lock Int 15 8 Th 6 50014 001 16 Washer Lock Int 17 8 Th 8 50014 003 18 16 Nut Keps 4 40 51745 000 19 4 Nut Keps 6 32 51745 004 20 Nut 6 32 1007 0003 00 21 22 1 Knob Gray 2703 0002 00 23 1 Cap Gray with Dot 2705 0001 00 24 1 Fuseholder PCB 2802 001 01 Mount 25 1 Fuseholder Cap 57074 006 18 ELECTRICAL PARTS Electrical Parts Ref _ Electrical Parts Ref Item Qty Des Description Part Number WI Resistor O 1 2 Ohm 1 4W 52154 971 WA 596 R217 R317 Resistor 2 4 100 Ohm 1 52154 305 R417 AW 5 R609 R122 Resistor 1 3 3 R602 KOhm 1 52154 281 R203 R206 R218 R303 R306 Resistor 10 4 10 KOhm 1 52154 257 R403 R406 R418 R603 R101 R102 R103 Resistor 5 6 100 KOhm 52154 233 RUS
14. 5 C S101 will remain closed and there will be no voltage drop across DS5 If the transformer temperature rises above 75 C S101 will open and remove AC primary power to T101 The AC voltage will be developed across DS5 and it will light EELA H3MOd NO sigiany Q O Qo AW1dSIG SOLLSONO VIO i o AHLINDHIO Av 1dSIa SOLLSONDVIG HO1293LOHd TVWH3HL 193138 1 SWHO 00O SHO 00O 00r O O O O 39NYHO SWHO 0080 SWHO 0080 SWHO 0020 VIA 123135 39V L 10 1 AC SWHO 009 SWHO SINHO TINNVHO 12 tre A A A E t HO y HO ANO Olan y FIGURE 3 Block Diagram 10 CHAPTER 4 MAINTENANCE INTRODUCTION This section provides service information for normal maintenance factory performance tests and troubleshooting tips GENERAL MAINTENANCE SAFETY CONSIDERATIONS Service and adjustments should be performed only by qualified service personnel Any adjustment maintenance and repair of the opened equipment while any power or voltage is applied should be avoided as much as possible and should be carried out only by a skilled person who is aware of the hazard involved It is possible for capacitors inside the equipment to still be charged even if the equipment has been disconnected from its power source Be certain that only fuses with the requi
15. E 18 AWG BUSS 50704 007 89 INSULATO R WASHER KEYSTON E 3045 1006 0017 00 105 AR THERMAL GREASE 51741 000 106 AR SOLDER_P ASTE 55360 90 WASHER 10 1006 0021 00 91 SCREW 10 32 X 1 4 SLOT CAD PLATED 1008 1002 00 92 LOCKWAS HER 6 CAD PLATED 50014 001 93 SCREW 10 32 X 5 8 PHIL CAD PLATED 1008 6006 00 94 HEAT SINK 9180323100 95 HEATSINK IRC 7 362 BA 4502000300 96 RIVET 50015 150 97 17 SPACER 46293P1 98 14 PEM NUT 6 32 59832 003 99 PC RECPTACL E AMP 1 380758 0 2004 0008 00 24 CHAPTER 6 DIAGRAMS and SPECIFICATIONS DRAWING Number Title AS3225 P C B Assembly Power Supply Model PS31 SD3225 Schematic Diagram Power Supply Model PS31 sheet 1 of 2 SD3225 Schematic Diagram Power Supply Model PS31 sheet 2 of 2 AS3233 Final Assembly Model PS31 WD3525 Wiring Diagram Model PS31 25 26 canon 5 ITEMS INDICATED ARE NOT INSTALLED AT THIS LEVEL DED 2088 P RES geze 9 C218 C318 C418 R228 R328 amp R428 NOT USED FOR STANDARO em 3 INSTALL LED S AND AUDIBLE ALERT AFTER INSTALLING BRACKET Tm R407 y R307 3 8 1121 2 APPLY THERMAL GREASE BETWEEN MICA INSULATORS ITEM 110 AND HEAT SINK ITEM 112 1 U302 amp U402 LEADS MUST BE CUT DOWN T
16. Frequency Response 75 Hz to 20 kHz 3 dB unloaded Signal to Noise and Hum Ratio Ref to 2V pp 60 dB Program Input Balanced or unbalanced transformer isolated program assignable to channels 1 3 Program Input Sensitivity 28 dBm to 14 dBm Ref 600ohm for 2 volts pp on RTS line Program Input Impedance 10 000 ohms Program Frequency Response 3 dB 100 Hz to 20 kHz input to RTS line Indicators Channel STATUS Three green LEDs Channel FAULT One red LED and one audible alarm THERMAL OVERLOAD One red NEON type Switches One PROGRAM CHANNEL ASSIGN switch One AUDIBLE ALERT on off switch one POWER switch three 200 400 ohm IMPEDANCE SELECT switches Temperature 0 50 C operating 0 75 C storage Power Requirements Voltage 100 120 220 or 240 VAC 50 60 Hz Power 100 volt amps Fuses AC Panel Fuse 100 120 volts 3A slow blow 200 240 volts 1 5A slow blow Internal DC fuses each channel 6A fast blow Dimensions Height 3 5 inches 8 9 cm Width 19 inches 48 3 cm Depth 10 5 inches 26 7 cm Weight 14 5 pounds 6 6 kg 33
17. LLATION The Model PS31 can be rack mounted or used free standing The rack mount is a standard 19 inches wide by 3 5 inches high Allow room for cable connections ELECTRICAL INSTALLATION CONNECTING INTERCOM STATIONS NOTE When connecting intercom stations do not exceed the power supply capacity either for one channel or for all three channels Power supply capacity is graphically illustrated in Figure 1 If more capacity is required refer to PS 31 Capacity on page 4 Connect intercom channels to the OUTPUTS connectors on the rear panel Pin assignments are printed above the connectors These connectors provide three alternatives for intercom channel connection e Connectors J101 through J106 can be used to connect various combinations of two channels e Connectors J107 and J108 can be used to connect all three channels e Connector 1109 can also be used to connect three channels but unlike all the other connectors no power is supplied at this connector This connector can be used to interconnect the audio channels when using two PS31 power supplies USING TWO PS31 S TO EXPAND CAPACITY If there are more stations on one or more channels than the power supply capacity will allow two PS31 power supplies may be used to double capacity For each channel that requires added capacity 1 Usethe J109 connectors on both power supplies to interconnect the audio and ground pins of the desired channel See PS 31 Front and Back View on
18. O 425 010 BEFORE INSTALLATION me GAASS b RI I N 5 N N NV OO a dari o gt Ol Du 5 OO ger Qu b 0 24 WO 92 CTO Pod a m O 002155 56 Cb 0 ToN anuos EE TT DUM 5 5 FIGURE 5 PCB Assembly Power Supply Model PS 31 27 BACK PANEL F105 120 3 58 240V 1 5A8B 6 AC 1 nov 0 220V 240 1 2 OUTPUT 2 OUTPUT CH 1 3 OUTPUT sm C105 wur 22207 4107 EE 3101 4102 ro oun c 115 230 o 2 12 xi wt 123 M 1191 124 Et er E125 we SAY O ws 6127 129 Gay T103 10K 600a C109 91 1K v UK AN 01 1KY 52 1000 75 amr FAST f N 2307 CHANNEL 1 INPUT SEE PAGE 2 POWERED 0 P CMANNEL 2 DC INPUT SEE PAGE 2 30v POWERED O CHANNEL 3 DC INPUT SEE PAGE 2 POWERED rrt UPDATED FOR PROD RELEASE UPDATED PER 13168 ADDED R226 8326 8426 THER 1 UPDATED FOR PROD RELEASE C209 C309 C409 WERE 1 35 TANT C122 WAS 1 50 TANT REVISED PER ECO 1553 REDRAWN WITHOUT CHANGE WITMOUT CHANGE CHANGED 03 VALUE PER ECOS 2326 REMSED Eu
19. RTS Two Wire Intercom Series MODEL PS 31 Power Supply User Manual RTS SYSTEMS TW INTERCOM SYSTEM OWER SUPPLY 9300 4437 00 Rev J 12 2007 PROPRIETARY NOTICE The product information and design disclosed herein were originated by and are the property of Telex Communications Inc Telex reserves all patent proprietary design manufacturing reproduction use and sales rights thereto and to any article disclosed therein except to the extent rights are expressly granted to others COPYRIGHT NOTICE Copyright 2007 by Telex Communications Inc All rights reserved Reproduction in whole or in part without prior written permission from Telex is prohibited WARRANTY NOTICE See the enclosed warranty card for further details CUSTOMER SUPPORT Technical questions should be directed to Customer Service Department RTS Telex Communications Inc 12000 Portland Avenue South Burnsville MN 55337 USA Telephone 800 392 3497 Fax 800 323 0498 RETURN SHIPPING INSTRUCTIONS Customer Service Department Telex Communications Inc Lincoln NE Telephone 402 467 5321 Fax 402 467 3279 Factory Service 800 553 5992 Please include a note in the box which supplies the company name address phone number a person to contact regarding the repair the type and quantity of equipment a description of the problem and the serial number s SHIPPING TO THE MANUFACTURER All shipments of product should be made vi
20. S31 into the variable voltage power transformer Set the PS31 POWER switch to ON Set the PS31 AUDIBLE ALERT switch to ON Turn on the variable voltage power transformer Slowly turn up the voltage Watch for excessive sustained current consumption above ampere While the voltage is being increased the audible alert indicator should sound and the FAULT light should flash Stop increasing the voltage when the standard operating voltage level is reached Set the AUDIBLE ALERT switch to off Turn the PS31 POWER switch off the STATUS lights should fade and finally the FAULT light should blink The audible alert should not sound Turn the POWER switch back on Turn the AUDIBLE ALERT switch on POWERED CHANNEL TEST The following procedure tests channel 1 Repeat for channels 2 and 3 An 20 21 Connect the DC meters and capacitive load to the test load as shown in Figure 5 1 Set the capacitive load to OFF On the test load set the output current potentiometer in the fully CCW position minimum output load Plug one of the four wire channel output cables into J108 on the PS31 This will be the powered output cable Connect the ground lead of the powered output cable to the test load ground terminal Connect channel 1 of the powered output cable to the powered channel terminal of the test load Connect the second four wire output cable to J109 on the PS31 This will be the AUDIO ONLY output cable Connect
21. UT POWER SELECTION 12 IMPEDANCE SELECTION eee eee eee eee eene 2 CHANNEL DC OUTPUT FUSE REPLACEMENT 12 Installation eere nennen nenne 3 TEST 20000000000000000 12 MECHANICAL INSTALLATION ann 3 TEST EQUIPMENT na 12 ELECTRICAL INSTALLATION 3 INITIAL INSPECTION anna 12 POWER UP TEST anna 12 OPERATION ai iiu nti 5 POWERED CHANNEL TEST eese POWER UP INDICATIONS 5 un um gt FAULT INDICATIONS 22222 22222221121132022 5 P ROU EEE SOON THERMAL OVERLOAD ees 5 IMPEDANCE SELECT SWITCHES 5 REPLA CEMENT PARTS 1 7 PROGRAM INPUT onen 5 WHERE TO OBTAIN PARTS 17 MECHANICAL PARTS 18 THEORY OF 7 ELECTRICAL PARTS 19 GENERAL secet sicot aa A 7 AC TO DC CONVERSION ee 7 DIAGRAMS AND SPECIFICATIONS 25 IMPEDANCE GENERATOR 7 Specific ti nS ee 33 PROGRAM INSERTION AMPLIFIER 8 DISPLAY AND DIAGNOSTIC CIRCUITRY 8 CHANNEL STATUS INDICATORS 8 FAULT INDICATOR e 8 THERMAL OVERLOAD 6 CHAPTER 1 DESCRIPTION DESCRIPTION GENERAL The Model PS31 supplies 32 volts regulated DC power to each of three intercom channels It has short circuit and thermal
22. Z5U 39 7 C310 ioamosvy 22676 113 C102 C316 SR205E104 C103 C410 MAA C104 C122 CAP 22 UF C312 50V Z5U CAP 22 UF O zZ CR 46 12 C214 P10394TB 51821 640 C409 CERAMIC ND 314 40 5 MONO 52676 115 MURATA C414 C603 ZR205E224 C217 MAA AVX C317 KEMET C417 CAP ELEC 41 1 C128 RAD 1 0 51821 106 C123 CAP CER UF 50V 47 3 C311 DISC 120 52157 531 C121 CAM 50 C123 C105 CAPACITO C202 R AC T LINE 2200 PF ECK T 48 2 106 ATS222ME 517003 003 CAPACITO OR BOR 42 12 C302 R ELEC 51821 110 DRS222ME C303 RAD 10 UF 50V b C304 CAP ELEC C402 49 1 C604 RAD47UF 51821 068 C403 16V C404 CAP ELEC 50 1 C605 47 51821 534 C606 50V oe CAPACITO CAP C206 R ELEC MYLAR gt 51 1 C601 1514 R102 2L E Hrs od 0 001 UF 50V caos UF 25 V C207 CAPACITO R ELEC C307 44 3 RAD 100 51821 529 C407 UF 35 V 21 Electrical Parts Electrical Parts Item 52 Qty Ref Des D101 D102 D105 D106 D214 D314 D414 Description DIO REC 7 AMP MR752 Part Number 1601 0752 00 53 D211 D212 D215 D311 D312 D315 D411 D412 D415 DIODE 1N914B 1601 0914 OBT Ref 54 12 D109 D110 D111 D112 D204 D206 D304 D306 D404 D406
23. a UPS Ground prepaid you may request from Factory Service a different shipment method Any shipment upgrades will be paid by the customer The equipment should be shipped in the original packing carton If the original carton is not available use any suitable container that is rigid and of adequate size If a substitute container is used the equipment should be wrapped in paper and surrounded with at least four 4 inches of excelsior or similar shock absorbing material All shipments must be sent to the following address and must include the Proof of Purchase for warranty repair Upon completion of any repair the equipment will be returned via United Parcel Service or specified shipper collect Factory Service Department Telex Communications Inc 8601 East Cornhusker Hwy Lincoln NE 68507 U S A Attn Service This package should include the following Table of Contents DESCRIPTION 1 MAINTENANCE ees aenea seen rae n 11 DESCRIPTION 1 INTRODUCTION nn 11 GENERAL 1 GENERAL MAINTENANCE nn 11 FEATURES ia 1 SAFETY CONSIDERATIONS 11 STATUS INDICATORS 1 6 2 ACCESS tm PEE 1 INPUT POWER uusscscssseesseccesesscsnccccscesssnncccecsssssnancescscesess 2 CLEANING 11 INTERCOM CHANNEL CONNECTIONS 2 INP
24. enerator supplies regulated 32 volts DC to the channel and also provides the channel terminating impedance The following paragraphs describe the impedance generator for channel 1 Other channels are identical Diodes D202 and D201 and resistors R202 and R201 divide the raw DC for the variable DC reference This variable DC reference allows the quiescent output voltage of the regulators to follow the rms value of the AC mains voltage Capacitors C202 C203 and C204 and resistors R203 and R206 are a low pass filter for the variable DC reference and provide fast start up response time Integrated circuit U202B resistors R214 R215 and R217 and capacitors C210 and C207 amplify and buffer the variable DC reference Resistor R213 and capacitor C209 decouple the supply voltage for integrated circuit U202 Resistors R211 and R208 set the amount by which the output voltage of the regulator exceeds the variable DC reference R205 sinks the quiescent current from R208 Diode D203 clamps excessive output voltage of the regulator due to transients while diodes D204 and D206 protect the regulator from reversed voltages due to shorts on the output line Resistors R219 and R221 sense the output current from the regulators into the RTS line Integrated circuit U202A together with capacitors C212 and C214 and resistors R220 R225 R223 and R216 differentially amplify this output current and feed it back to the adjust terminal of the regulators to create the audio impeda
25. er using a low pass filter on the analyzer approximately 30 kilohertz The hum and noise should be less than 1 0 millivolt rms 25 Repeat tests for PS31 output channels 2 and 3 FUNCTIONAL TEST OF ALL OUTPUTS Plug a user station into each output connector Verify that each station works TO CAPACITIVE LOU D TO POM ER ED CHANNEL TO DC vOLTHETER 1 TO DETORTI N ANALYZER MUSTEEHEATSNEED Cul TO DC WOLTMETER 2 OUTPUT 0 2 CORRESPOND CURRENT TOO ADJUSTMENT pray 8 10 A c 7 SHORTIMG TERMINAL TO GROUND METERS AND CAPAC IT E LOAD The heatsink thermal resistance must be less than 0 5 Prolonged testing will create dangerous hot temperatures Gare must be taken p build safe estjig to avoid burns FIGURE 4 Test Load 14 4 4 TROUBLESHOOTING o OFF 100pF 220pF O 47 4 1000pF H 4 2200pF H 4 4700pF 0 4 0 01pF O L 0 022yF He 0 047pF I 0 01pF I o22yF GROUND o o 0 4 pos 047yF 1 0pF Figure 2 Capacitive Load Box ALRS 11G 3 PROGRAM HIGH 2 PROGRAM Low GROUND Figure 3 Program Input Cable SLAG y p aroun CHANNEL 3 CHANNEL 2 1D GHANNEL 1 Figure 4 Channel Output Cable Proble heck
26. he POWER switch During normal operation the three CHANNEL STATUS indicators should be lit and the FAULT and THERMAL OVERLOAD indicators should be off FAULT INDICATIONS If there is a fault on a channel the CHANNEL STATUS indicator for that channel will turn off and the red FAULT indicator will flash If the AUDIBLE ALERT is set to ON the alarm will beep Possible causes of a fault include overvoltage overcurrent short circuit to ground or severe brown outs THERMAL OVERLOAD If the PS31 overheats the THERMAL OVERLOAD indicator will turn on and AC power to the PS31 will be shut off Normal operation will resume when the PS31 cools Possible causes of a thermal shut down include overloading the output channels or improper internal mains voltage selection IMPEDANCE SELECT SWITCHES The IMPEDANCE SELECT switches on the rear panel allow each channel to be set for 200 ohm or 400 ohm operation Select 200 lt F128M gt W lt F255D gt NORM for each channel operated independently Select 400 lt F1283M gt W lt F255D gt DUAL for each channel connected to another channel through the AUDIO ONLY connector 7109 Figure 1 PS 31 Front and Back View on page 2 PROGRAM INPUT If a program source is connected to the PROGRAM INPUT connector on the back of the PS31 it may be routed to any one of the intercom channels using the CHANNEL ASSIGN switch Use the LEVEL control to adjust the program level on the selected channel CHAPTER
27. nce Diodes D207 D208 D211 D212 D209 and D210 clamp the audio output voltage to avoid over driving the RTS line and allow fast recovery from large transients Diode D214 protects the impedance generator from an over voltage on the RTS line Capacitor C215 is an RF bypass and resistor R227 biases diode D214 on with 10 mA of current for dry line operation Toggle switch S201 located on the rear panel selects an output impedance of 200 or 400 ohms Since the impedance generator operates at 400 ohms toggle switch 5201 shunts the output with 390 ohms for a 200 ohm output PROGRAM INSERTION AMPLIFIER The program insertion amplifier circuitry accepts balanced or unbalanced input from any source and injects this input via a bilateral current source onto the RTS line Program audio present at connector J110 rear panel is applied via input isolation transformer T103 to PROGRAM LEVEL potentiometer R111 Resistor R606 and capacitor C601 provide RF suppression Integrated circuit U601a capacitor C602 and resistors R603 and R602 amplify the input and provide a low impedance drive for the following stage Integrated circuit U601b capacitor C606 and resistors R604 R607 R609 R605 and R608 form the bilateral current source which turns the input voltage into an output current Capacitors C604 C605 and resistor R610 blocks any DC potential on the RTS line Diodes D601 and D602 protect integrated circuit U601 from transients and resistor R601 and ca
28. overload protection with automatic recovery when the fault is removed FEATURES Program Input There is a PROGRAM INPUT connector on the rear panel A CHANNEL ASSIGN switch on the front panel assigns the program to any of the three channels A LEVEL control adjusts the program level to the intercom channel nm PROGRAM e po CHANNEL STATUS 1 THERMAL 3 Q ON FAULT 1 2 3 OVERLOAD 2 POWER RTS SYSTEMS 3 e e TWINTERCOM SYSTEM CHANNEL AUDIBLE POWER SUPPLY ASSIGN ALERT O O T ELEX CONNECTOR 1 2 CH1 3 253 CH1 2 3 OUTPUTS CONNECT TO O So over PIN OUT CODE PIN 1 COM PIN 1 COM PIN 1 COM PIN 1 CH1 TW INTERCOM SYSTEM COMPONENTS TELEX COMMUNICATIONS INC PIN 2 CH1 2 1 PIN 2 CH2 PIN 2 CH2 REFER TO OPERATION MANUAL MADE IN USA PIN 3 CH2 PIN 3 CH3 PIN 3 CH3 PIN 3 CH3 PIN 4 COM PROGRAM INPUT TW INTERCOM SYSTEM 2 1 BALANCED POWER SUPPLY OUTPUTS PIN 1 GROUNDED MODELPS 31 jit CH 1 2 CH 1 2 CH 1 3 CH 1 3 2 2 1 23 CH1 2 3 CH 1 2 3 Push INTERNALLY J101 J102 J103 J104 J105 J106 FUSED IMPEDANCE SELECT CHANNEL 1 2 3 AC POWER 4000 e e oe e a e opp S O CAUTION TO REDUCE THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE J107 J108 J109 2001 WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE NORM Q
29. pacitor C603 decouple the power to integrated circuit U601 DISPLAY AND DIAGNOSTIC CIRCUITRY The display and diagnostic circuits detect fault conditions and warn the user with front panel lights and an audio indicator CHANNEL STATUS INDICATORS The channel status indicator for channel is described The channel status indicators for channels 2 and 3 are identical As long as the output voltage on channel 1 is above approximately 21 VDC diode D205 will conduct causing transistor Q201 to be on which turns on DS201 the CHANNEL 1 STATUS LED on the front panel If the channel 1 voltage drops below approximately 21 volts transistor Q201 shuts off LED DS201 goes dark and the fault indicator circuitry is notified through diode D215 FAULT INDICATOR If pin 5 of integrated circuit U103 is driven high by an under voltage condition on any channel the flasher circuit which consists of half of integrated circuit U103 capacitor C126 and resistors R116 and R117 will flash the FAULT indicator LED DS101 and pulse the audible alarm circuit The audible alarm oscillator consists of the other half of integrated circuit U103 capacitor C127 and resistors R120 and R121 THERMAL OVERLOAD Switch S101 is a thermal sensing switch connected in series with the power switch It is attached to the power transformer T101 The front panel THERMAL OVERLOAD indicator DS5 is connected across S101 If the transformer temperature remains below approximately 7
30. page 2 2 Divide the stations that you wish to connect into two groups Connect one group to the first power supply Connect the other group to the second power supply For each group do not exceed the capacity either total or per channel of the power supply 3 On both power supplies set the IMPEDANCE SELECT switches for the channel to the 400 lt F128M gt W lt F255D gt DUAL position Leave all impedance switches for channels that are not interconnected in the 200 lt F128M gt W lt F255D gt NORM position PROGRAM INPUTS A program source may be connected to the PROGRAM INPUT connector on the rear panel Pin assignments are printed above the connector See PS 31 Front and Back View on page 2 To connect an unbalanced program source connect pin 2 to to pin 1 Then connect program ground to pin and program HI to pin 3 If two PS31 s are interconnected a separate program source may be connected to each AC POWER Plug the AC power cord into the PS31 and into an AC mains outlet The PS31 is factory set for either 110 120 volt operation or 220 240 volt operation The operating voltage is NOTE indicated on the back of the unit Operation at 100 110 volts or 200 220 volts requires an internal modification Refer to MAINTENANCE on page 11 a SHJ 1139 42 H3SHWITN HUMBER OF SPEAKER STATIONS FIGURE 2 PS 31 Capacity CHAPTER 2 OPERATION POWER UP INDICATIONS Turn on t
31. red current rating and of the specified type fast blow time delay slow blow etc are used for replacement The use of repaired fuses and the short circuiting of fuse holders must be avoided ACCESS To get inside the Model PS31 remove the screws on the top and bottom covers Slide covers off toward the back of the unit CLEANING Clean the outside of the Model PS31 with denatured alcohol or a mild solution of detergent and water Clean the interior with dry low pressure air The circuit boards can be cleaned with 1 1 1 trichloroethane or Freon TF Do not allow these or any solvents to get into any potentiometers 11 INPUT POWER SELECTION CAUTION These maintenance instructions are for qualified personnel only To avoid electric shock do not perform any servicing unless qualified to do so Disconnect AC power before servicing The Model PS31 operates on 100 120 200 or 240 volts AC at 50 60 hertz depending on the internal power settings To convert from one mains voltage to another remove the covers and set the internal switch jumpers and use the proper rear panel fuse as specified in Table 3 The switch and jumpers are located on the circuit board next to the power transformer connector TABLE 1 Voltage Selection AC Source 5107 us anis Pod Setting Add Remove Fuse 100 VAC 115 W2 W3 W1 W4 3A 120 VAC 115 W1 W4 W2 W3 3A 200 VAC 230 W2 W3 W1 W4 1 5A 240 VAC 230 W1 W4 W2 W3 1 5A
32. tor level should remain constant The AC voltage should read between 0 71 and 0 89 volts rms Return the oscillator frequency to 1 kilohertz Place a 200 ohm resistor across the distortion analyzer input The AC voltmeter should read from 0 45 to 0 55 volts rms Remove the 200 ohm resistor Short the POWERED CHANNEL terminal of the test load to the SHORTING TERMINAL on the test load The output short circuit current should be 0 5 amp 0 5 volts at DC voltmeter 2 3096 The channel 1 STATUS light should be extinguished the FAULT light should be flashing and the audible alert should sound Remove the short The FAULT light should go out and the channel 1 STATUS light should turn on 13 22 On the test load slowly turn the output current adjustment control CW The output current as measured at DC voltmeter 2 should slowly increase The FAULT light and audible alert should again come on as the output voltage drops below approximately 21 volts measured at DC voltmeter 1 The current will reach a maximum fold back value of 2 0 amps 2 0 volts on voltmeter 2 3096 before falling very suddenly back to the short circuit value of 0 5 amps 23 Turn the output current adjustment control on the test load fully CCW The AC voltmeter should still read 1 0 to 1 1 volts rms and the waveform on the oscilloscope should be a sine wave free from distortion 24 Turn the PROGRAM LEVEL control fully CCW Read the hum and noise on the distortion analyzer met
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