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Messages - conorfitzpatrick2
Pages: [1]
1
« on: September 15, 2017, 01:11:34 AM »
Hello again! I looked at the IGBT and it was in fact shorted. I ordered some replacement IGBTs, desoldered the old one and soldered in a new one. Plugged it in and switched it on, pressed the 'ON' button and placed a metal rod into the coil. The circuit turned on the coil and started heating the rod!! After 10 seconds of heating the rod the circuit shorted and the power went out.... gutted! I had the heat sink properly attached with thermal paste and the fan running. All I can think is that the IGBT is under spec in a critical area/ aspect but I can't figure out which it is. I have attached the two data sheets. On the left is the original IGBTs sheet and on the right is the sheet of the IGBT I got sent from RS components. (I ordered the exact same IGBT but received this one!) Can you spot anything obviously wrong with the replacement? Thanks. Conor.
2
« on: September 01, 2017, 10:23:25 PM »
Thank you so much! I hadn't even thought of removing the heat sink yet. I am away for a week but will try this and update again. Thanks again. Conor.
3
« on: September 01, 2017, 09:15:23 PM »
Hello! I just soldered the replacement fuse onto the PCB and it turns on! This was without the coil wire connected... I then connected the coil and turned on the induction heater - so far so good - I then turn on the 'touch' button to activate the coil and it trips the circuit breaker in my workshop! The fuse on the PCB doesn't blow and neither does the fuse in the plug. I measured the voltage across the coil attachment points and read +750V. The heater has functioned perfectly in the workshop before so I know it SHOULD be fine. I have wrapped the coil in such a way that none of the wire is touching itself so the coil is not 'shorting'. The soldering on the back of the PCB looks completely normal. Do you have any idea what might be causing this surge and trip? Thanks, Conor.
4
« on: August 31, 2017, 09:43:36 PM »
That sounds right! I'm afraid I have since lost the bits of the fuse so will have to try the F fuses - I have ordered a pack of 10 from RS components. Thanks again. Will update when arrived and tested.
5
« on: August 31, 2017, 03:20:12 PM »
Hello yes mine was wrapped in heat shrink too. When I removed the plastic I could see that it was blown so I noted down what was written on the sides like you say: 5G 15A US So nothing about fuse speed on there. Is the photo of your fuse? If so I can use the same fuse as the two products are almost identical. Thanks again for your help!
6
« on: August 31, 2017, 12:47:31 PM »
Hi Mads. I left a comment on your YT video (part 2 of hacking the IKEA stove). After hearing your advice about the second fuse I have checked and it is in fact blown so I have been researching a replacement on RS components and others. I see that it is a 15A cartridge fuse in axial lead form. Do you have any idea what 'speed' fuse I should get: fast acting (F) or slow acting (T). I read that F is the most common speed used but T allows for a short, harmless surge of current that I imagine the coil causes? Any advice on this issue would be really appreciated! Thanks very much for your help!
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