responding to
http://www.polytechforum.com/metalwo...he-560451-.htm
, tmackinator wrote:
BPdnicholsBP wrote:

On 2012-11-26, tmackinator

wrote:
Our monarch 10ee relay drops out 1 minute after puching the
control ON button.
Any suggestions on what to look at?-TM

Which 10EE? There are at least three types, maybe four.

The first three with the same DC spindle motor

1) The old motor-generator style.

2) The type with tube electronics.

3) The type with sold-state electronics

The next one a factory retrofit

4) Three phase spindle motor with VFD controlling the spindle
motor.

I suspect that yours is (2) above -- and perhaps a burnt out
tube results in an unbalanced current draw, and triggers an overcurrent

as soon as the remaining tube filaments heat up. (Or, there could be a

thermal delay relay which waits until the filaments are expected to
heat
up, and then switches on the DC power -- which could trip an
overcurrent
sensor if there is a bad tube.

But it could be in any of them -- just less likely for me to
think of what is the probable mechanism.

More information likely from people who actually own such
machines. I just wish that I owned one. :-)

Good Luck,
DoN.

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Hi Don this is a repost of my reply to another response to my issue:Thanks for
the reply, We have the Thyratron control with the two timers.It is the last
iteration of this design. I have since corrected the issue. What I found was
the the diodes in REC3 were both blown. When replaced with more modern diodes
of a proper rating, the spindle braking function was corrected and
surprisingly the control relay stayed latched also. We had replaced the small
c3j a while ago for a similar issue. The problem started when one morning the
lathe was switched on and went into full spindle speed immediatly. That will
really wake you up! The lathe would switch off at about exactly a one minute
interval which I now suspect was caused by the filiment timer not sensing some
type of current draw due to the open diodes in rec3? BTW, we have two of
these machines, one tube type and one solid state type. These are just
excellent to use, they have spoiled me for other lathes!
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