My control box has a e-stop which cuts all power, two position key switch which enables the cooling fans in one position and the fans and HV in the other, and then a momentary fire button. Neon indicator lights for fan and fire enable. And it's all built into a plastic enclosure with less than common twist lock connectors for the hookup to the coil umbilical.
perl -e 's==UBER?=+y[:-o]}(;->\n{q-yp-y+k}?print:??;-p#)'
Harold Weiss <hweiss@xxxxxxxxxx> wrote:
> One recommendation is the requirement of having "2"
> separate operations to turn on high voltage; this requires
> at a minimum a Main Disconnect (Lockable Safety Switch)
> and a start-stop push-button station with seal in contactor.
> This requirement supports my contention you should never
> "instant on" high voltage equipment. YMMV, but I've seen
> catastrophic, spectacular failures doing this.
>
I built this into my controller. After the main set of breakers at 20A
comes 1 30 amp relay before the variac and 1 after. The first is controlled
by the HV Enable PB/relay and the second by the Fire/Fire Latch PB/Key
switch and relay. E-stop will kill all but the Fire Latch, and Fire Latch
must be returned to Off before restart can occur. Since the latch keeps the
second relay closed, I had to make it so that it must be turned off on a
restart to prevent the HV going active when HV Enable was pressed. But
before you can access the HV Enable, you have to turn the momentary
keyswitch to the start position, and select gap and/or start the rotory.
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