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ASCO 940 With Manual Engine Switch Schematic?

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Birken Vogt

Senior Member
Location
Grass Valley, Ca
Wondering if anybody has access to the schematic of engine controls for an ASCO 940 switch ca. 1993? This one has an optional switch (IIRC it is labeled as switch "SS") on the front panel in addition to the regular test switch. The optional switch has positions for generator engine off, auto, manual on. Problem is that in positions other than "off" the engine starts even though normal power is available. There are also some add on time delay relays IIRC called "TR" and "TR1" down at the bottom. Or maybe TD and TD1?

Trouble is I lost my photos of the job. Will be back soon to get more info but trying to get the ball rolling right away.

How do I ping somebody? If I type @ATSman will that get his attention?
 
Last edited:
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Birken Vogt

Senior Member
Location
Grass Valley, Ca
Birken Vogt said:
Wondering if anybody has access to the schematic of engine controls for an ASCO 940 switch ca. 1993? This one has an optional switch (IIRC it is labeled as switch "SS") on the front panel in addition to the regular test switch. The optional switch has positions for generator engine off, auto, manual on. Problem is that in positions other than "off" the engine starts even though normal power is available. There are also some add on time delay relays IIRC called "TR" and "TR1" down at the bottom. Or maybe TD and TD1?

Trouble is I lost my photos of the job. Will be back soon to get more info but trying to get the ball rolling right away.

How do I ping somebody? If I type @ATSman will that get his attention?
Click to expand...

I will add, it also continues to try to start even with relay NR and SE completely removed from the circuit board, if the hand switch is moved from off to auto. Thinking the TD relays at the bottom may have something to do with this, be able to command the genset to keep running when they should not.
 
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Birken Vogt

Senior Member
Location
Grass Valley, Ca
Figured it out with ASCO's help, it has additional relays TR and TR1 and TR1 is going bad. Will probably go in and remove this whole cockamamie setup and go back to the timers available on the main board, this violates the KISS principle and the features are not even being used.
 
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