Heatbed maxes out at 58 deg with SSR October 31, 2015 12:39AM |
Registered: 9 years ago Posts: 11 |
Re: Heatbed maxes out at 58 deg with SSR October 31, 2015 04:03AM |
Registered: 9 years ago Posts: 5,232 |
Re: Heatbed maxes out at 58 deg with SSR October 31, 2015 05:04AM |
Registered: 11 years ago Posts: 14,685 |
Re: Heatbed maxes out at 58 deg with SSR October 31, 2015 08:03AM |
Registered: 9 years ago Posts: 916 |
Re: Heatbed maxes out at 58 deg with SSR October 31, 2015 09:06PM |
Registered: 9 years ago Posts: 11 |
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dc42
Low cost DC-DC SSRs have between 1.5V and 2V drop. Heater power varies as the square of heater voltage. So the voltage drop explains the reduction in temperature. You will also find that the SSR generates a lot of heat.
My solution is to use an AC mains voltage heated bed driven by a DC-AC SSR. Follow the link in my signature for more.
The simplest way for you to get your existing bed heating properly is to buy a good DC-DC SSR with a low voltage drop. Crydom make good ones. Expect to pay a lot more than you did for your existing SSR.
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 03:31AM |
Registered: 11 years ago Posts: 14,685 |
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 09:31AM |
Registered: 10 years ago Posts: 1,159 |
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 12:14PM |
Registered: 11 years ago Posts: 14,685 |
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dougal1957
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dc42
I did a quick search on what is readily available, and the the least expensive one I found that I consider suitable was the DC100D40C.
Youch £65 at RS makes my AC one seem very cheap at around £40 inc the SSR and at 400x400mm
Doug
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 08:38PM |
Registered: 9 years ago Posts: 11 |
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 11:00PM |
Registered: 11 years ago Posts: 14,685 |
Re: Heatbed maxes out at 58 deg with SSR November 01, 2015 11:43PM |
Registered: 9 years ago Posts: 916 |
Re: Heatbed maxes out at 58 deg with SSR November 02, 2015 04:20AM |
Registered: 9 years ago Posts: 445 |
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nebbian
Cripes, no need to drop that sort of dough.
Something like this would do the job: http://www.jaycar.com.au/Electromechanical-Components/Relays-%26-Accessories/Panel-Mount/Heavy-Duty-Chassis-Mount-Relays---30A/p/SY4040
Re: Heatbed maxes out at 58 deg with SSR November 02, 2015 10:12AM |
Registered: 10 years ago Posts: 1,159 |
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Koenig
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nebbian
Cripes, no need to drop that sort of dough.
Something like this would do the job: http://www.jaycar.com.au/Electromechanical-Components/Relays-%26-Accessories/Panel-Mount/Heavy-Duty-Chassis-Mount-Relays---30A/p/SY4040
It's mechanical, so it would probably wear out rather quick + plus it would make the printer noisier.
Re: Heatbed maxes out at 58 deg with SSR November 02, 2015 07:50PM |
Registered: 9 years ago Posts: 11 |
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dougal1957
Quote
Koenig
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nebbian
Cripes, no need to drop that sort of dough.
Something like this would do the job: http://www.jaycar.com.au/Electromechanical-Components/Relays-%26-Accessories/Panel-Mount/Heavy-Duty-Chassis-Mount-Relays---30A/p/SY4040
It's mechanical, so it would probably wear out rather quick + plus it would make the printer noisier.
I Agree with Koenig something like a seven switch would be better
or Power Expander Whilst I have one of these it is as yet unused so can't comment on it's performance in use.
Doug
Re: Heatbed maxes out at 58 deg with SSR November 02, 2015 09:24PM |
Registered: 11 years ago Posts: 14,685 |
Re: Heatbed maxes out at 58 deg with SSR November 03, 2015 02:22AM |
Registered: 9 years ago Posts: 445 |
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dc42
I can't find any specification of that Power Expander, so no way of telling whether it is suitable or not.
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TECHNICAL SPECIFICATIONS
Power handling designed for 12 to 24V DC (absolute maximum 30V DC)
Signal_in 5 to 24V DC
Signal_in and power_in are galvanically isolated.
Maximum power current up to 60A peak (unfused)
Board outline 30X30mm
Mounting holes 22X22mm (Ø3.2mm)
Please note that the Power Expander is unfused.
Re: Heatbed maxes out at 58 deg with SSR November 03, 2015 02:29PM |
Registered: 11 years ago Posts: 14,685 |
Re: Heatbed maxes out at 58 deg with SSR November 04, 2015 02:50AM |
Registered: 9 years ago Posts: 5,232 |