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Diode Relay Coil
What could be the cause of short circuiting of freewheeling diode across a DC electromagnetic Relay?
A diode is connected across a coil of a 110VDC realay in a PLC based control circiut in a Gas Turbine control . Diode found short leading to failure of 110VDC control supply
Most likely the diode specs were exceeded, either in the peak inverse voltage or maximum current. If the diode was selected "casually", a "just pick one and put it in" sort of approach, this is the likely situation. Don't sweat the math, just try a much bigger diode. They are cheap.
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AUTOMOTIVE RELAY COIL 60 AMP 12 volts DC diode. |  |
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US $9.29 | 25d 13h 46m |
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TELEDYNE 712D-12 TO-5 RELAY DPDT internal diode coil transient suppression TH | |
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US $25.99 | 13d 18h 30m |
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Pinball relay size coil Original Bally GT-30-1300 with 2 diodes and 3 terminals | |
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US $20.00 | 1d 19h 18m |
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Pinball relay size coil Original Bally GO-36-6900 with diode | |
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US $12.00 | 1d 19h 18m |
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Pinball relay size coil Original Bally G-31-2000 with diode | |
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US $5.00 | 1d 19h 18m |
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Relay MSD Relay 8961 $40.34 MSD HIGH CURRENT RELAY -- 30 amps rating, 12 V, single pole, blade terminal type; Wiring harness not included; Designed to activate accessories that draw high current; Manufactured using fully automated process and sophisticated coil winding procedure; Ideal for use with MSD RPM activated switch where 12 V is required to activate multiple high current devices simultaneously as multiple stage nitrous solenoids.. Auto Parts Warehouse has extensive MSD Relay catalogs.We are now offering FREE shipping on all MSD Relay orders over $50.00. Our secure msd relay catalog is available every hour of everyday. Shop with confidence for all your msd relay needs. MSD Relay are In Stock and available today. Save up to 60% off dealer price on your next MSD Relay purchase. Our online catalog contains a wide selection of the OEM and aftermarket parts you need at unbeatable prices |
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Aquamist Power Relay 40A Universal $16.5 Aquamist Power Relay 40A UniversalIt is absolutely essential to use a power relay when a new equipment is added to a cars electrical supply, especially when high current is drawn. The relay above has a 12V coil and can switch up to 40Amp, coil resi |
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Standard Motor Production Relay $10.99 " For starter, brake light and fuel pump Replaces OEM NO. 31504-91A with a diode" |
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Standard Motor Production Micro Relay w/Diode $6.99 Replaces OEM NO. 31522-00B (starter) |
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Electronic Specialties EL190 OfftheCar Relay Tester $67.01 Quick offthecar relay tester. Checks relay coil and switch contacts. Fails bad relays. Automatic test with Good/Bad indication. Relay Buddy is a quick go / nogo tester for the most common automotive relays. It provides you with an indication of the general health and functioning of the relay switch contacts and coil. Relay Buddy will check the control side of the relay by applying a signal to the relay coil while it checks for proper functioning of the relay contacts. Relay Buddy operates the relay several times during each test session as it watches for consistency in every cycle. Relay Buddy will fail the relay and light the RED LED if any one of the cycles proves unsuccessful during the test session Specs. Settable to 4 and 5 pin relay. Switch contact are loaded to detect excessive resistance. Uses vehicle 12V battery for power. Green Light if relay is good Red Light if relay is bad. |
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Beck/Arnley Relay - 203-0062 $15.69 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0146 $14.09 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0125 $19.59 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0046 $126.99 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0005 $25.59 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0108 $53.49 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Anti-Lock Brake Parts products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0116 $61.89 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0079 $52.09 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0101 $70.89 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0168 $12.79 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0131 $13.99 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0141 $14.09 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0100 $73.69 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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Beck/Arnley Relay - 203-0176 $37.19 Provides reliable relay switching. Manufactured with robust materials for internal coil and switch. Anticorrosion terminals. Most Relays products are available for in-store pickup from Advance Auto Parts. |
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SG energizer-selfrunner with piggy-Back coil
How do I close a circuit with a Basic Stamp (from Parallax) chip.?
I'm trying to control another device that already is setup for remote operation (a camera). It has a remote 2 button switch. I would like to use my basic stamp and close the switch by perhaps using a relay, engergizing the coils to close the switch and make the contact instead of the button switch on the remote. Is this the right way to do this? If so do I need a diode inline with the relay on both sides?
I don't think that there is much voltage going though, but I'm unfamiliar with how I'd have to use a transistor to connect it. Would I have to "saturate" the transistor so it would have the camera's pin go high? It just seemed easier to use a mechanical relay that's the only reason I picked it.
If you use a relay you will need a diode across the coil in the oposite direction of current. Why not use a transistor as a switch. see how much current flows through the switch when it is closed.
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