Belts burning on a Kaeser Sigma 30hp rotary air compressor

by Jack Vines
(Spokane, WA, USA)

Kaeser Sigma air compressor

Kaeser Sigma air compressor

Our plant had a Kaeser Sigma 30hp rotary air compressor which burned up belts


Rather than troubleshoot, they just bought a new one. I got the used unit for hauling it away.

I'm hoping it is salvageable to use for a large-volume sandblasting project.

What gasoline engine horsepower would be required to replace the 30hp 3-phase electric motor?

Where do I start troubleshooting what caused the unit to lock up enough to burn off the belts? The compressor spins freely, so my first thought is pressure lockup somehow.

thanks in advance

jack vines

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Does Kaeser SM-11 also require 120vac ?

by Fadi
(BLACKWOOD, NJ)

Hi ,I have bought a Kaeser compressor model: SM-11, about 3 years ago, I'm in the process of getting it on line.
I connected the high voltage 460vac, does this compressor also require 120vac ?

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compressor Kaeser DS-141 remains long in load

by Francisco Ramos
(San Cristobal, San Cristobal, Dominican Republic)

Kaeser DS-141 air compressor

Kaeser DS-141 air compressor

Sorry for the traduction, I speak Spanish.

unloading setpoint = 108 psi
loading setpoint = 90


When the compressor starts the first time the loading and unloading cycles lasting 5 min and 1 min respectively. As time passes the loading time it is becoming bigger all day and finally stays on. this is because the compressor reaches a state that does not have the ability to reach setpoint unloading. After that the pressure in the system falls slowly day by day.

When other compressor is turned on, this makes the loading and unloading cycles, but eventually the same thing happens as above.

Could be the air inlet temperature, or any mishandling system with respect to pressure.

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