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Micromaster 440 controlling many motors

1/29/2010 11:00 AM	Rate (0)
Marvins Posts: 11 Rating: (0)	Hi experts, I tried to use a MM440 15kw to control 4 motors coupled with gears,two of the motors are 1hp andone 5hp andone 2hp, the four motors has its own separate overload for its protection. On commissionning theinverter, and during testing the motors tries to start and latter trips off the 4 motors.The drive displays alarm 501,Tried to increase the ramp up time to 15secs but still behaves the same way. An urgent reply will highly be appreciated.
Marvins Posts: 11 Rating: (0)
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1/29/2010 4:26 PM	Rate (0)
Graeme Platinum Expert Joined: 6/4/2008 Last visit: 8/5/2025 Posts: 1518 Rating: (327)	Hi, have a read of this link /tf/WW/en/Posts/18410- there may be some valuable insights. Mr Moderator, don't close this thread please!! Check your total motor limits are within the capablity of te drive, as the A0501 warning means you are near or at the current limit. regards, Graeme

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2/1/2010 11:38 AM	Rate (0)
JensS Posts: 739 Rating: (55)	Pls. have a look into this FAQ: http://support.automation.siemens.com/WW/view/en/14390055
JensS Posts: 739 Rating: (55)
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2/9/2010 9:27 AM	Rate (0)
Marvins Posts: 11 Rating: (0)	The stator resistances of the motors were not known for P350, so the drive calculated it by itself. On starting of the drive none of the 4 motors worked, it tries to move and suddenly stops. I increased the ramp up time to 20sec but still did same. Seems the drives could not overcome the starting torque of the load connected. The motor is connected to a gear and the gear coupled to a reducer then to the conveyor carrier for bottle washing application. Pleas i need a support on this urgently as the plant is shut down on this problem.
Marvins Posts: 11 Rating: (0)
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