Heated bed relay wiring confirmation May 20, 2015 11:19AM |
Registered: 8 years ago Posts: 51 |
Re: Heated bed relay wiring confirmation May 20, 2015 11:24AM |
Registered: 10 years ago Posts: 14,672 |
Re: Heated bed relay wiring confirmation May 20, 2015 11:39AM |
Registered: 8 years ago Posts: 51 |
Re: Heated bed relay wiring confirmation May 20, 2015 12:13PM |
Registered: 10 years ago Posts: 869 |
Yes. It's serving as a flyback or supression diode. When the RAMPS board cuts off the heated bed, the inductive load caused by the relay coil can cause a voltage spike. The diode allows the spike to flow back around through the relay where it's dissipated rather than back into your electronics causing damage.Quote
usslindstrom
Please forgive my ignorance, but you're referring to the following then? *Attached.
Re: Heated bed relay wiring confirmation May 20, 2015 12:17PM |
Registered: 8 years ago Posts: 51 |
Re: Heated bed relay wiring confirmation May 20, 2015 12:45PM |
Registered: 10 years ago Posts: 14,672 |
Re: Heated bed relay wiring confirmation May 20, 2015 01:51PM |
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Re: Heated bed relay wiring confirmation May 20, 2015 03:44PM |
Registered: 10 years ago Posts: 869 |
This datasheet matches the appearance and has the same pin numbers, but the wiring diagram would not be correct. Pins 85 and 86 are for the coil. 87 the NO terminal, and 87a NC terminal, and 30 the common terminal on the other end of the contact.Quote
dc42
If terminals 30 and 85 on the relay are the coil, and terminals 86 and 87 are the normally-open contacts, then that diagram is correct. However, the Omron relays I found on their web site do not have those connections. Please link to the datasheet of the relay you intend to use, or at least provide its part number.
Re: Heated bed relay wiring confirmation May 20, 2015 08:43PM |
Registered: 8 years ago Posts: 51 |
Re: Heated bed relay wiring confirmation May 20, 2015 10:00PM |
Registered: 9 years ago Posts: 606 |
Re: Heated bed relay wiring confirmation May 20, 2015 10:14PM |
Registered: 8 years ago Posts: 51 |
Re: Heated bed relay wiring confirmation May 21, 2015 12:24PM |
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Re: Heated bed relay wiring confirmation May 21, 2015 01:25PM |
Registered: 10 years ago Posts: 869 |
Normally what the designations at the end mean will be listed in the datasheet. -T stands for tape, -TB stands for Tape Box and -TP is for Tape Reel. If you're only buying 1 or 2 or 10 how they are packaged doesn't matter. If you're buying 10,000 for a production facility, you'd obviously want a format compatible with your machine.Quote
usslindstrom
*For the 1N4002 diode, it appears to have a few designations at the end (-T, -TB, -TP), are those significant, or just part #'s?
Re: Heated bed relay wiring confirmation May 21, 2015 05:06PM |
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Re: Heated bed relay wiring confirmation May 21, 2015 11:11PM |
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Re: Heated bed relay wiring confirmation May 22, 2015 01:14AM |
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Re: Heated bed relay wiring confirmation May 22, 2015 08:05AM |
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Re: Heated bed relay wiring confirmation May 23, 2015 02:08AM |
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