On 2012-11-28, tmackinator wrote:
responding to

[ ... ]

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

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.

Great!

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!

I hope that it did not have the maximum size chuck installed at
the time.

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?

Sounds reasonable to me.

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!

I'll bet. We had one at work -- one of the motor-generator
style, FWIW, with a bad tach, so spindle speed was a guess. Just tune
it by ear. :-)

Glad that it is now working for you.

Enjoy,
DoN.

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