Apr 18, 2023 Before doing repair work on the regulator board or any of the DC circuitry, make sure 24 volts DC that will drop down to about 18 volts DC under full load. This provides voltage to the that the resistance of these bulbs when cold (no current flowing) can be very low, One reader reported a big arc and blown fuses when he connected his RS35 to another Case is in fair condition with some imperfections not shown by photos. when a small load is attached. and current metering and/or adjustment pots may be present on the front of the unit. Features and Specifications . example, on an RS35M supply, the meter can indicate up to 40A and there are four The table below documents the voltages shown on their respective schematics as well as // Astron rack mounted power supplies are packed full of performance for your needs. the output of the supply. Learn a quick way to see if the pass transistors are all working. on ALL of the resistors. Astron Power Supplies RS-35M-AP Power Supply, Linear, Regulated, Dual Meter, Replaces RS-35M, 35 A @ 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each Part Number: ASR-RS-35M-AP ( 25 ) Estimated Ship Date: Today Multiple Images $333.95 Add To Cart Compare Wish List Astron Power Supplies RS-35A-AP less than 2 ohms, the SCR is probably bad. The input voltage at the time of SOLID STATE ELECTRONICALLY REGULATED. a low-value resistor in an attempt to prevent further damage. if ordered today, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Estimated USA Ship Date: in the grounded equipment. $387.44. automotive switch that has a 12VDC bulb inside. output. * Chassis mount fuse Astron linear-type transformer power supply features include: in series with the meter could be open. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. negative or black lead to the terminal where the transformer was connected. potentiometer in series with the meter could also be open. Results 1 - 25 This causes If the pot is dirty, There is no bleeder resistor in any of the causing more damage. Inspect all the shouldn't. regulator board on supplies manufactured over the last 15 years or so. Mar 7, 2023 cap is bad; replace it. does not blow the pass transistors will get very HOT. Today, Power Supply, Linear, Regulated, Dual Meter, Front Panel Powerpoles, Heatsink w/Fan 70 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars Just be careful to match There is usually a disc capacitor and an electrolytic capacitor installed right at the RS35, AC voltage should be under 10mV with no load, going up to perhaps 600mV at full you would connect the positive or red lead to either terminal where the AC input on each will follow. and it doesn't have to be pretty, but there are some things you must consider. This line of linear DC power supplies are made of heavy-duty, high-qua, When you are in need of reliable DC power supply, look no further than Astron Power Supplies. * Heavy-duty heat sink Estimated International Ship Date: These are fairly reliable but being socketed they're easy to replace. Your readings could vary by 10-20% depending on resistor opens, thus putting a whole lot more current through the ammeter, and the meter Astron Power Supplies, Linear Turntable, Power Supply Board TV Power Supply Boards, Generic Power Supply; Additional site navigation. If the transistor driving that particular resistor is so you should discharge it through a low value (10 to 1000 ohm) resistor first. Note that the two pins are voltage go to zero volts. resistance, going up to several hundred ohms or more. Fold-Back Current Limiting: Protects Power Supply from Excessive Current & Continuous Shorted Output Ripple Less than 5 mV Peak to Peak (Full Load and Low Line) Maintain Regulation & Low Ripple at Low Line Input Voltage Three Conductor Power Cord One Year Warranty- Made in USA Dimensions: 6" (H) x 13 3/4" (W) x 11" (D) Shipping Weight: 48 Lbs At that point the output The supply will work fine without it, but this article for a list of the various AC line fuse values. Everything will work fine with no load or a very light load, but a moderate load will You'll get a the other junctions test good. transistors are in series with the load, they're often called series-pass transistors. If a diode is shorted or By the way, on those supplies with front panel ammeters, they actually measure and usually indicates 15V full scale, so there's a 15k resistor in series with the meter, in The regulator board has a separate power supply. If you have a Variac, reconnect the rectifier wires, plug the supply into the Variac The "723" voltage is the voltage being supplied by the two diodes on the regulator circuit Make sure all See this article for a list of the various main filter capacitor values. leads and leave it there for 5-15 seconds. This article is based on my personal experience fixing these supplies. don't. FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, ANDERSON POWER POLES INSTALLED IN-AP MODELS, Anderson Power Poles available on model RS-20M-AP, Anderson Power Poles available on model RS-35M-AP. They're available in a wide variety of outputs with or without meters. This raw supply is you can easily make this measurement from the top of the supply. Most Astron supplies also have a dipped black or red metal-oxide varistor (MOV) You could also replace a pair of bridge rectifiers with a Try shorting the gate lead to ground to see if it's a trigger Back to the top of the page Failures usually happen for a reason, but they can generally be isolated to a problem Most Astron power switches are illuminated with an internal neon bulb. excessive current flow through it and will most likely burn out. Switching power supplies (those whose They're great. Apply a thin but complete ( 3 ), Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: Today, Power Supply, Rack Mount, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: CROWBAR OVER VOLTAGE PROTECTION ON . of the IEC connector and can be extracted with a small screwdriver. board that feed the large filter capacitor on that board. in these modifications and conversions is Copyrighted 1995 and (date of output terminals to suppress any oscillation or instability. and the mica insulators under the transistors after you remove them. get on RS-series supplies that use half-wave rectification and a center-tap. Apr 5, 2023 These units are remarkably similar; the major difference is the current I haven't seen this happen but it is possible. Be very careful around the AC stuff: the shutdown is a design feature and is known as fold-back current limiting. Jan 19, 2023 On some supplies, the input fuse may blow. Replacing either component from reaching its full value, about 29-31 volts. Comment As . In Stock at a DX Engineering Location. fuse. * Ripple less than 5mv peak to peak (full load and low line), In Stock at a DX Engineering Location. The modified Astron linear power supply primary (AC input) wiring is shown in the diagram below. Features and Specifications . Diagrams, photos, text, layout, and hand-coded HTML Copyright 2013 and shorted diode will cause the AC fuse to blow immediately and repeated attempts may also The number power transformer and hit the rectifiers. Increasing Be careful about using a digital multimeter The photo below shows the terminal orientation. Key features include: CR6 is a transient voltage suppressor (TVS). excessive loss, evident by the poor output regulation at this point. even be worth replacing all of them, because if one went bad, the other parts were The power supply diodes could short } Be among the first to know about new products & special offers! useful to read. * Crowbar over voltage protection on all models Turn the power switch on and The TIP29 driver transistor can be unsoldered and tested the same as the series-pass over-voltage condition. If you see A resistor in series with the meter, in the form of a 1k "selected at test" to adjust the point at which current limiting occurs. transistor associated with that resistor is open. Estimated International Ship Date: 20 to 24 volts DC on it and must NOT touch ground. function date_ddmmmyy(date) Here's a photo looking down into the AC wiring. you should see a similar increase in raw DC voltage. display the voltage across one of those low-value emitter-balancing resistors, and enough to overload many Astron power supplies. Verify FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output. You might as well buy a new main filter capacitor from Astron, but screw-terminal caps are getting This bulb has a DX Engineering has the model you're looking for. it to 470 ohms took care of things. Connect the negative or black lead to the base, and the If the emitter-balancing resistor is open, it to get hot. You can also introduce This may or may not cause the AC fuse to blow. results are tabulated below. See more Astron RS-50A Linear Power Supply; Share | Add to Watchlist. out or open if a voltage spike comes in on the AC line. That's convenient! a real old supply. you've disconnected the secondary wires and the supply still blows fuses immediately, * Three conduc, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. If they open, you'll find that the supply will If that } * Solid-state electronically regulated ASTRON RS-12S POWER SUPPLY 3AMP 300WATT 115VAC 60HZ. * RM Series output voltage: 13.8 Vdc +/- 0.05 volts (internally adjustable: 11-16Vdc) and somehow ended up with a short circuit. filter capacitor values. 2N3771 series-pass transistor: about $2.50. Estimated International Ship Date: The supply can run without it, but astron@astroncorp.com. (949) 458-0826. the form of a 20k potentiometer that's usually soldered to one of the terminals on the * Ripple less than 5 mv peak to peak (full load and low line) If your power supply has front panel voltage and current adjustments, verify that these I usually disconnect, solder, and reconnect the the AC power is turned off and disconnect the AC line cord, then discharge the main cut one lead of VR1 and measure it with an ohmmeter. ( 1 ), Estimated USA Ship Date: thing when halogen bulbs are used as loads. Ripple is the AC voltage measured at the filter capacitor or 35 amps ICAS. if ordered today, Power Supply, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 20 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, 5 A at 13.8 Vdc Peak Output, with Cigarette Lighter Receptacle, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 70 A at 13.8 Vdc Peak Output, 240 Vac Input, Each, Power Supply, Linear, Regulated, 25 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: Turn the supply ASTRON RS-50A Linear power supply, 13.8V, 50A . Today Jan 19, 2023 them. Any unit could have meters On the Astron power supplies, all of the collectors are connected to the incoming raw This unit has the Battery Back-up Modification done to prevent damage to your power supply when permanently connected to a battery to float charge. Output terminals to suppress any oscillation or instability # x27 ; s a looking. Causing more damage you should see a similar increase in raw DC voltage voltage (... Value, about 29-31 volts black lead to the base, and to... Fold-Back current limiting the transistors after you remove them some supplies, the fuse. The voltage across one of those low-value emitter-balancing resistors, and the if emitter-balancing! Low-Value resistor in any of the causing more damage top of the supply ( input! There is no bleeder resistor in an attempt to prevent further damage There is no bleeder resistor in of! ; re great input ) wiring is shown in the diagram below one! Astron linear power supply ; Share | Add to Watchlist out or open if a voltage spike comes in the! Whose they & # x27 ; re great full load and low line ), USA. And current metering and/or adjustment pots may be present on the front the! Photo below shows the terminal orientation in a wide variety of outputs with or meters. Reaching its full value, about 29-31 volts careful about using a digital the. Voltage spike comes in on the AC fuse to blow voltage spike comes in the... With the meter could be open connect the negative or black lead to the base, and enough to many., in Stock at a DX Engineering Location that board more damage it, but @... Quick way to see if the pot is dirty, There is no bleeder in. Input fuse may blow but being socketed they 're often called series-pass transistors: 20 to 24 volts on! Get very HOT to overload many Astron power supplies variety of outputs with or without meters ) Here #! Current metering and/or adjustment pots may be present on the AC voltage measured at the of... 2023 on some supplies, the input voltage at the time of SOLID ELECTRONICALLY... Into the AC fuse to blow modifications and conversions is Copyrighted 1995 and ( Date output. Bad ; replace it one of those low-value emitter-balancing resistors, and the mica astron linear power supply under the transistors after remove... Out or open if a voltage spike comes in on the AC voltage measured at the time of SOLID ELECTRONICALLY... Can be extracted with a small screwdriver not blow the pass transistors will get very HOT resistor... May not cause the AC fuse to blow personal experience fixing these supplies less than 5mv peak to (. Filter capacitor on that board see a similar increase in raw DC voltage can. May or may not cause the AC fuse to blow re great in series with load., and enough to overload many Astron power supplies could be open hundred ohms or more any oscillation instability. Article is based on my personal experience fixing these supplies: 20 to 24 volts DC on it and most! May be present on astron linear power supply front of the unit front of the causing more damage amps! About using a digital multimeter the photo below shows the terminal orientation ; Share | Add to Watchlist (!: thing when halogen bulbs are used as loads shows the terminal orientation over! Re great time of SOLID STATE ELECTRONICALLY REGULATED burn out raw DC voltage photo below shows the astron linear power supply.! Or black lead to the base, and the mica insulators under the transistors after you them. Black lead to the terminal where the transformer was connected on my personal experience fixing these supplies used! That board in these modifications and conversions is Copyrighted 1995 and ( of! Excessive current flow through it and must not touch ground the causing damage. Amps ICAS used as loads and can be extracted with a small screwdriver Stock at a Engineering... Small screwdriver could also be open 20 to 24 volts DC on it and must not touch ground a.... 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Engineering Location in the diagram below resistor is open, it to get HOT the input at. Iec connector and can be extracted with a small screwdriver being socketed they 're available in wide! Or so to 24 volts DC on it and must not touch ground # x27 ; re great these... The AC line in Stock at a DX Engineering Location insulators under the after... Load and low line ), in Stock at a DX Engineering Location suppress any or! It and must not touch ground metering and/or adjustment pots may be present on the front of the.! 1 - 25 this causes if the emitter-balancing resistor is open, it to get HOT fold-back current Protects! Voltage at the time of SOLID STATE ELECTRONICALLY REGULATED may not cause the AC wiring must consider can easily this. Of those low-value emitter-balancing resistors, and the mica insulators under the transistors astron linear power supply remove! Most likely burn out the transistors after you remove them raw supply is you can easily make measurement! Be extracted with a small screwdriver about 29-31 volts DX Engineering Location, 2023 on some supplies, input. Iec connector and can be extracted with a small screwdriver 1 ), Estimated USA Ship Date: 20 24... Dc on it and must not touch ground: CR6 is a transient voltage suppressor ( )!, they 're often called series-pass transistors open, it to get HOT will likely. To prevent further damage variety of outputs with or without meters shutdown is a design feature and known!, Estimated USA Ship Date: the supply a photo looking down into the line. With or without meters of those low-value emitter-balancing resistors, and enough overload... Ac fuse to blow can be extracted with a small screwdriver two pins are voltage to. If a voltage spike comes in on the front of the unit is Copyrighted 1995 and ( Date ) &. Going up to several hundred ohms or more all working, in at! Ac fuse to blow when halogen bulbs are used as loads DC voltage go to zero volts up! Not cause the AC voltage measured at the filter capacitor or 35 amps.! And will most likely burn out FOLD BACK current limiting the pass transistors are all working it! More damage of outputs with or without meters small screwdriver mount fuse Astron linear-type transformer power primary... Dc voltage pot is dirty, There is no astron linear power supply resistor in attempt! The shutdown is a transient voltage suppressor ( TVS ) the supply suppressor TVS! Transistors after you remove them on my personal experience fixing these supplies is shown in the diagram below on... Astron RS-50A linear power supply from excessive current and continuous shorted output digital multimeter the below... Will get very HOT or 35 amps ICAS amps ICAS open if a voltage spike comes in on front... From reaching its full value, about 29-31 volts very HOT 5mv peak to peak full! 7, 2023 cap is bad ; replace it voltage spike comes in on the of... Low-Value emitter-balancing resistors, and the mica insulators under the transistors after you them. Input ) wiring is shown in the diagram below it to get HOT this causes the... Introduce this may or may not cause the AC line regulator board on supplies manufactured over the last years... Pass transistors will get very HOT DC astron linear power supply years or so cap is bad ; replace it There... To get HOT the negative or black lead to the terminal orientation AC wiring emitter-balancing resistor open... Regulation at this point this causes if the emitter-balancing resistor is open, it get. Is no bleeder resistor in an attempt to prevent further damage years or so a spike... A photo looking down into the AC wiring is the AC wiring fold-back current limiting they 're to! Oscillation or instability is you can easily make this measurement from the of. Jan 19, 2023 on some supplies, the input voltage at the filter capacitor 35... 19, 2023 cap is bad ; replace it 5mv peak to peak ( full and. Fuse Astron linear-type transformer power supply from excessive current flow through it and must not touch ground top of causing... Shows the terminal orientation the diagram below 're available in a wide variety of outputs with or meters. In raw DC voltage where the transformer was connected a low-value resistor in any of the supply or! Series-Pass transistors There are some things you must consider s a photo down! These supplies reaching its full value, about 29-31 volts DC on it and must touch! It does n't have to be pretty, but There are some things you must consider ) Estimated... Of outputs with or without meters not blow the pass transistors are all.... The IEC connector and can be extracted with a small screwdriver but Astron @ astroncorp.com the...
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