I have a Gast blower/ Emmerson motor that has 'issues.'
0) 1 Phase motor, nominal 1hp, NEMA 42C frame design,
1) Wiring is okay -- new machine -- no shorts -- no opens.
2) Has typical Klixon thermal protection which appears to also be okay... N/C across all three contacts.
3) Has both run windings and start windings: dual voltage 240/120 VAC with classic six wire lead outs/ taps at peckerhead.
4) It has a capacitor 'footprint' that is obviously tied into the start windings... in series, naturally.
5) There is no second capacitor in its design.
6) There is NO Centrifugal Switch to cut out the start winding.
7) There is no apparent room on the shaft to mount a centrifugal switch. (!)
I've known Split-Phase motors that have no capacitor yet do have a start winding and a centrifugal switch.
This scheme is the reverse: no switch while having a capacitor.
I have yet to track down a wiring diagram that is anything other than a tap connection pattern. (ie 120VAC wiring and 240VAC wiring connections.)
I can't find any reference to a motor of this design.
Larger Gast blowers/ Emmerson motors use cap-start// cap-run schemes -- WITH a centrifugal switch.
I have one.
The Klixon does not appear to have any solid state/ trick capability to cut out the start winding. If it does, -- it's not working on this machine as intended.
In all of the Klixon liturature, there is absolutely no reference to solid state switching -- as would be required to replace a centrifugal switch.
Ultimately, is this a motor that was built up by sleepy troops that slipped by quality control or is a component ruined?
In all respects, this blower looks to have never been placed into service at any time. It looks pristine -- ready for a photo-spread.
Edited by Tesla (05/04/15 04:46 PM)