Manual Motor Starter

[warraich]

Hello everyone,

I was reviewing a wiring diagram of the Eaton MST manual motor starter for single-phase motors and wanted to get some input from the forum members to ensure I’m interpreting the diagram correctly.

As per the wiring diagram (attached for reference):

• In HAND mode, the toggle is closed. Does this imply that the thermostat is bypassed? If so, why?
• In AUTO mode, does this mean the thermostat is not bypassed?

Thank you in advance for sharing your expertise!

 

[MTW]

Can you share where that drawing came from?

 

[warraich]

Can you share where that drawing came from?

yes, here is the link:

https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/manual-motor-starters-/enclosed-manual-motor-starter-with-run-light-and-hoa-pa038001en.pdf

 

[retirede]

Your understanding is correct. Follow the circuit.

 

[hbiss]

In HAND mode, the toggle is closed. Does this imply that the thermostat is bypassed? If so, why?

I believe that that application is just to illustrate a possible use for the starter/control station and how it functions.

-Hal

 

[MTW]

In the hand mode, it's a manual on, just like the manual starter switch contacts. It Would allow you to put the Hand /Auto switch elsewhere as stated in the description. to override the thermostat.

In the Auto mode it cycles on the thermostat.

 

[warraich]

thanks everyone for your input