Jason
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Posts: 17
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Post by Jason on Nov 22, 2017 18:55:36 GMT
Bit of an issue, possibly easily resolved and electronics is NOT my forte! Installed an E3DV6 onto newly designed carriage, which is fine. Re-wired identically the hotend wiring (I believe but am doubting now>?). Power on and heat raises NON-STOP, let the temperature get to 250° first off and canned the power after that. Things I've checked: 1. 24V Hotend - yes 2. Wiring identical as previous hotend - yes 3. Firmware - Marlin. Reflashed the firmware in case this was the issue That's all I got. Emailed Lucy at DP5 but what with businesses being busy thought I may as well post here also. Cheers for any pointers! Attachments:
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Post by 3dprintingmeathead on Nov 22, 2017 19:41:54 GMT
When you flashed the firmware, did you change the thermistor value? It comes with a different thermistor than the one with the kit. It's on e3ds wiki which value to use with marlin
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Jason
New Member
Posts: 17
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Post by Jason on Nov 22, 2017 19:58:21 GMT
Nope, wasn't aware. Thanks for that, will have a browse on the values and fingers crossed!
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Post by 3dprintingmeathead on Nov 22, 2017 20:11:06 GMT
Define temp sensor 05 Heater 0 max temp 285 If you are using the e3d v6(Not lite, that has a ptfe liner) No worries, it's been done before
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Jason
New Member
Posts: 17
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Post by Jason on Nov 23, 2017 3:41:54 GMT
Cheers MH, no joy yet: 1. Clone E3D-v6 Hotend Link: HERE2. Spec's of Hotend: Thermistor:100K NTC B 3950 ±1% ,Length 1 meter. So I've experimented with the following available scripts: // 5 is 100K thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (4.7k pullup) // 11 is 100k beta 3950 1% thermistor (4.7k pullup) // 13 is 100k Hisens 3950 1% up to 300°C for hotend "Simple ONE " & "Hotend "All In ONE" ALL uploaded to Marlin Firmware Temperature on the above ALL still climbs. Temperature is displaying correctly, so temp' appears to be functioning, indicating firmware issue still(?) Still playing, head - wall - banging
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Post by 3dprintingmeathead on Nov 23, 2017 4:50:28 GMT
Can you salvage the old thermistor and install on new hot end? Did you run pid autotune on the last hot end? Maybe it could cause an issue after swap.
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Jason
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Posts: 17
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Post by Jason on Nov 23, 2017 5:17:27 GMT
Old thermostat was toast as well, no luck swapping that back. Not run the PID auto-tune yet, still watching video PID for dummies From what I can find, could be Mosfet needs replacing or not sure. Will keep trying and update here. Update: Testing with Ponterface, regardless of set temperature (50°/185° etc.) temperature rises past the setpoint. Update: Tested Mosfet behind Temperature wires to hotend (not sure if this regulates that) and it indicates gate is open, if I've understood the test correctly. Shows a value on diode setting on my multimeter of 265. Adjacent Mosfets show no value change, indicating gates are closed. I think! Thoughts? Attachments:
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Post by 3dprintingmeathead on Nov 23, 2017 14:07:14 GMT
Does the printer start heating up as soon as you turn on the power? Or does it only start heating when you tell it to,but heat past the point you tell it to? Does there seem to be an upper limit to how much extra it heats up? Maybe you could try heating to like 90c and see if it overshoot by a certain amount then stops. When mosfets go the way I've seen them go, they are permanently damaged and would start heating as soon as power is supplied. Also worth checking is ohm out the heater cartridge. Maybe the resistance is too low, like they sent a 12v heater, and it's flowing too much power that is charging the gate. 23 ohms for a 25w 24v heater, 14 ohms for a 40w 24v. 6 ohms for a 25w 12v, 3.5 ohms for a 40w 12v, give or take an ohm. If a 40w 12v heater cartridge is accidentally put on a 24v printer, it would output 164w, more than the first anet heated bed, might explain some crazy overshooting. If not at least I got to fire off a whole bunch of numbers that make me sound smart
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Jason
New Member
Posts: 17
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Post by Jason on Nov 23, 2017 18:33:57 GMT
Well you convinced me with those BiG words!
Heats up immediately on start up. Temperature continues to rise past any given setpoint (tested at say 30°/130°/185° etc/.) I will check resistance of the heaters as I have both 24V and 12V versions, so should be clear as mud!
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Post by tanephar on Nov 23, 2017 20:14:15 GMT
I had this happen to me after a brown out and had to replaced the board in the end, this might have stemmed from the wrong thermistor values to start with and could well have damaged the mosfet responsible for thermal control. Sorry to say. But try e replacement thermistor first if you have one handy just in case.
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Jason
New Member
Posts: 17
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Post by Jason on Nov 23, 2017 20:46:16 GMT
16 ohms on both 24v thermostats - so assuming it is a 24v 40w they both appear to be fine...
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