Hypertherm MAX PRO 200 CNC Connections - Quick Question
30 Sep 2023 13:26 #281933
by rodw
Replied by rodw on topic Hypertherm MAX PRO 200 CNC Connections - Quick Question
Tommy knows more than me on this subject so I have included a copy of the drawing but I would have thought J3.6 an J3.7 would be better places to pick up the voltage for a THCAD. That seems to be where PCW suggested.
It does not really matter how long the HV pulse is, it can still damage stuff. I can understand your reluctance to deviate from the manual
It does not really matter how long the HV pulse is, it can still damage stuff. I can understand your reluctance to deviate from the manual
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30 Sep 2023 16:37 #281942
by tommylight
Replied by tommylight on topic Hypertherm MAX PRO 200 CNC Connections - Quick Question
See "optional", it literally says the wiring is taken from a terminal block near plasma interface board, not where the drawing shows them.
It also shows:
- 2 of spark gapes rated at 5KV in series (read about it, or you will think this is the max, it is not)
- several 20KV capacitors in parallel to high voltage transformer
-- means the voltage is over 10KV but under 20KV.
And a lot of over 1KV parts on the outputs.
The HF/HV transformer has one side wired to positive, so that would make it's way to THC if taken as shown, but in this case would still be OK as PCW mentioned.
The fact remains, those are the same wires so does not influence readings, but where you wire the THC does matter a lot. As far as possible from HF/HV stuff, and sure as hell not at the torch terminals, not even for blow back start that produces the least amount of interference.
Yet, there are THC wired to terminals and working, but the risk is way to high to tell people it is OK.
Even if the THC survives and works, any personnel working on the machine might have hands touching the THC wires in the control box when the torch fires thinking it is 5V or 10V stuff, most probably will survive blow back and be dizzy for a day or two, most probably will not survive HV or HF/HV, if wired at the torch terminals.
-Examples
As a side note, search youtube for "welding robot crash", it is MIG welding, has no HF/HV of any kind, max voltage in open circuit is 50V, working voltage 22-28V, yet it ruined the robot on first arc! It does not read the voltage, the only wires to MIG is torch on through a relay, yet the induced EMI is more than enough to send it flying. No proper shielding/grounding in place.
Also on youtube, Jeremy Fielding ruined his robot on first arc, again no THC, no voltage reading, just torch on. But no proper shielding/grounding.
-Home work
take a car ignition coil, wire it to a battery while holding the wires = nothing happens when touching the battery but it does when disconnecting them, a lot. Any transformer will do instead of ignition coil, try primary and secondary, preferably with 12V battery, bigger jolt!
DO NOT try this if you have known heart issues, people with chronic arrhythmia will probably not survive this, despite being "only 12V"!!!
It also shows:
- 2 of spark gapes rated at 5KV in series (read about it, or you will think this is the max, it is not)
- several 20KV capacitors in parallel to high voltage transformer
-- means the voltage is over 10KV but under 20KV.
And a lot of over 1KV parts on the outputs.
The HF/HV transformer has one side wired to positive, so that would make it's way to THC if taken as shown, but in this case would still be OK as PCW mentioned.
The fact remains, those are the same wires so does not influence readings, but where you wire the THC does matter a lot. As far as possible from HF/HV stuff, and sure as hell not at the torch terminals, not even for blow back start that produces the least amount of interference.
Yet, there are THC wired to terminals and working, but the risk is way to high to tell people it is OK.
Even if the THC survives and works, any personnel working on the machine might have hands touching the THC wires in the control box when the torch fires thinking it is 5V or 10V stuff, most probably will survive blow back and be dizzy for a day or two, most probably will not survive HV or HF/HV, if wired at the torch terminals.
-Examples
As a side note, search youtube for "welding robot crash", it is MIG welding, has no HF/HV of any kind, max voltage in open circuit is 50V, working voltage 22-28V, yet it ruined the robot on first arc! It does not read the voltage, the only wires to MIG is torch on through a relay, yet the induced EMI is more than enough to send it flying. No proper shielding/grounding in place.
Also on youtube, Jeremy Fielding ruined his robot on first arc, again no THC, no voltage reading, just torch on. But no proper shielding/grounding.
-Home work
take a car ignition coil, wire it to a battery while holding the wires = nothing happens when touching the battery but it does when disconnecting them, a lot. Any transformer will do instead of ignition coil, try primary and secondary, preferably with 12V battery, bigger jolt!
DO NOT try this if you have known heart issues, people with chronic arrhythmia will probably not survive this, despite being "only 12V"!!!
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