[TCML] Safety question - switching off
McCauley, Daniel H
daniel.h.mccauley at lmco.com
Tue Mar 25 12:24:41 MST 2008
1. Use a grounding stick (use current limiting resistors if there is
LOTs of energy in any capacitors as opposed to making a bang)
2. If using an MMC, use bleeder resistors between series stacks (since
even if you discharge the outer ends, the inner caps could still hold a
3. Use a multimeter
4. For DRSSTCs, you should ALWAYS put your grounding target onto the
toroid when connecting power, and getting close to making adjustments.
the DC power bus caps can hold a charge, and even if that portion isn't
turned on or plugged in, the coil can go off briefly if you plug just
the control driver
BTW, ask me how i know this . . . I got hit with a discharge from my
DRSSTC in the head once. The DRSSTC had a failure, and i disconnected
all power from the unit.
I plugged in the control driver power for troubleshooting and noticed
the +15V rail was being pulled down. I found one (of my parallel gate
driver) chips smoking hot,
and then i just removed the chip. Well, now the short was off the +15V
bus, the +15V bus came back on, and whatever energy was left in the DC
bus capacitors created a nice
big arc which hit me in the forehead about 6 inches away.
Yeah, i know. Explains a lot, right?
From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
Behalf Of Stephen J. Hobley
Sent: Tuesday, March 25, 2008 1:04 PM
To: Tesla Coil Mailing List
Subject: [TCML] Safety question - switching off
When you switch a coil off, how do you ensure that everything is
completely discharged before touching the components?
(As you can tell I'm getting really close to starting construction)
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