10 Apr
2012
10 Apr
'12
12:07 p.m.
On Mon, Apr 9, 2012 at 3:20 PM, David Riley <fraveydank at gmail.com> wrote:
I've had an RK05 catch fire....
The blower fan and spindle motor are 115V, even in units running off 230V
mains,. They run off the primary of the mains transformer acting as an
autotransformer, with the spindle motor between the cetre tap and
neeutral and the blower betwee nthe tap and live. The result is that
while the blower only has 115V across it, oen end of the winding is at
230V wrt the chassis. And the insulation isn't really up to it.
One of mine broke down, and the blower motor actually had small flames
inside it. I pwered fdown quickly and took it apart, the enamel on the
windings was charred... Fortuantely a friend had an old blower with bad
bearings, it wasn't hard to make one good one from the 2 bits.
I've heard of other RK05s over here suffering similar problems, BTW.
-tony
On Apr 9, 2012, at 12:18 PM, Henk Gooijen wrote:
Unless something bad just happened... then it smells like burning.
(thankfully, I've not had that experience with an RK05, but there was
this one RK07 with a defective cap in the main PSU that took out the
rectifier diodes - it was like a smoke bomb went off in the cabinet). And I like the typical smell of a just powered-up
RK05.
Smells like... victory.