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Micromaster 440

7/6/2020 2:25 PM	Rate (0)
Petar_Teo Posts: 1 Rating: (0)	Hello, i have Micromaster 440 on Atlas Copco compressor and all the time it flash 30.26 on drive panel. It is not possible to start drive. Please help!
Petar_Teo Posts: 1 Rating: (0)
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7/6/2020 4:50 PM	Rate (0)
Tractor Gold Expert Joined: 3/27/2008 Last visit: 12/30/2025 Posts: 1235 Rating: (149)	You are probably looking at the set point for motor speed in Hz, and fail to get the run command. Atlas Copco and Micromaster have a special configuration, this used USS protocol at one time, you may have to refer this to the manufacturer. Tractor
	Tractor
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7/7/2020 6:46 AM	Rate (0)
petr_sipor Bronze Member Joined: 3/25/2008 Last visit: 1/13/2026 Posts: 230 Rating: (8)	Check for you to convert the STOP button signal to the drive. This blocks the drive from turning on.

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12/14/2020 11:07 PM	Rate (0)
skye33 Member Joined: 12/14/2020 Last visit: 8/21/2025 Posts: 3 Rating: (0)	Our Atlas Copco compressor drive would not start either, I found that they use motor contactors the same way most folks use regular ice cube relays. One of them was the start command and it failed. There are 2 next to each other in the cabinet, One closes and then the other is supposed to follow. Maybe give that a gander? Mine is running again, right now in fact. Cheers!
	-Skye-
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