dpb wrote:
Travis Jordan wrote:
"dpb" wrote in message ...
Travis Jordan wrote:
wrote in message
oups.com...
I just wired up an Intermatic T103 timer. I noticed after 12 hours
the timer seems to be moving to fast (12 hours registered about 13
hours on the timer). Could I have a wiring issue or is this just a
faulty clock timer? TIA.
That timer uses a simple synchronous clock motor timer that depends
on the 60Hz AC power for accuracy. If the clock motor runs at all
it is probably keeping time. ...
The accuracy of the input doesn't guarantee the accuracy of the
output if it isn't manufactured under precise (enough) tolerances...

The synchronous motor drives a set of fixed tooth gears which in turn
drive the time display. "Manufacturing tolerances" won't cause the
timing accuracy to change. ...

That assumes the gears have accurate tooth spacing -- if they're off,
then the timing is off...


Actually, I'll agree on principle overall...was thinking of a short term
variability possibly, but on the long term, it has to run a revolution
per N cycles so not the OP's problem over 12 hours...

As noted elsewhere, the ratio of 60/50 to 13/12 is close enough to make
one wonder if OP order the wrong series number and got a 50Hz model or
perhaps it was just mislabeled...

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