While I work for Hypertherm (36 years) I have a well equipped home shop (yes, Millermatic250) with 2 cnc plasma machines and 2 hand held plasma's as well. All of the plasma's have the switch on the rear panel.....and when they were new I always thought it would be better if the switch was on the front panel. Now it is second nature to reach around the rear to fire them up.
Miller and Hyperthem both work hard to be able to build machines that conform perfectly to the various worldwide safety specs. Some of the specs are 180 degrees apart....so different models often have to be built for different regional specs. While costs savings are always important...safety is of the highest importance.
There were a few comments questions:
-Using a pushrod or linkage of some sort to move the switch to the front panel certainly would be possible....although would add cost and complexity.
-The length of the inside exposed power cable, which can have up to 600 volts, 3 phase power present, is of concern to the CE and CSA inspectors. Yes....even inside the power supply cabinet. I suspect (but don't know for sure) that their reasoning is the on/off switch needs to disconnect all power in the cabinet....a cable running from its strain relief on the rear to a front mounted switch would still be powered (maybe 18" to 24" long in some machines)...and could pose a safety issue. We can all argue that point....however the argument seems useless unless it changes the specs imposed on us by the CSA and CE regulators! If we ran the inlet power cord in the front of the machines...then the switch could also be in the front....in my mind that would be a pretty strange design!
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03-12-2013, 08:53 AM #30Junior Member
- Join Date
- Jun 2012