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ROBICON Doesn't Obey

Created by: Darrent23 at: 10/14/2014 7:16 PM (6 Replies)

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10/14/2014 7:16 PM	Rate (0)
Darrent23 Member Joined: 10/2/2014 Last visit: 11/28/2024 Posts: 9 Rating: (0)	Hello. The trouble that I have is that I request a demand of 50% to the drive and it gives more than 100% and it forces the drive to "Overspeed fault", the motor and drive's parameters are configured correctly according the motor and the application, I think that is the Conditioning board, even I can't Stop it with the "Manual Stop", only with the Emergency Stop, any idea??

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10/28/2014 2:25 PM	Rate (0)
N. Vijay Silver Member Joined: 3/17/2013 Last visit: 12/19/2024 Posts: 481 Rating: (43)	hi can you elaborate the problem. I mean below 50% demand there is no tripping. Is there encoder connected to motor. Can you send the parameter backup. What mode you are running the drive OLVC , CLVC.. Regards, Vijay

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This contribution was helpful to 1 thankful Users Darrent23

10/29/2014 12:08 AM	Rate (0)
Darrent23 Member Joined: 10/2/2014 Last visit: 11/28/2024 Posts: 9 Rating: (0)	Hi I solved changing the SCB, it was in RUN mode. Best Regards. Darrent

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11/12/2014 7:13 AM	Rate (0)
boyn84 Posts: 21 Rating: (0)	I got the problem with OverSpeed too. It was only at once. But I dont understend the reason. Pump set, controlled by Simatic PLC. Gen IV works in SMC mode and with almost full load. Occured the fault OverSpeed. I viewed event and historical logs and finded that: Run request disappearedsuddenly and Gen IV moved to STOP mode. After that Mtr Speed didnt start to decrease and it even started to increase to 120% This was 168 cycles in His.Log and after OverSpeed fault ocurred. We didnt fixed any extreme liquid flows in pipes. The pump stops immediately and check valve closes. I dont think that flow in pipe continue rotate the pump and even could increase the speed. And it does not understand why the run request disappeared. PLC didnt fixed it. Also we cheked DI terminals and didnt find any notes. So this is totally understandable fault situation. with best regards
boyn84 Posts: 21 Rating: (0)
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11/14/2014 6:51 AM	Rate (0)
kkllkkll Posts: 7 Rating: (1)	hi, Your motor is an SM, if the excitor fault, the speed will speed up and then will speed down by load. When the excitor fault, VFD may detect it, it will also stop. maybe a Temporary fault.
kkllkkll Posts: 7 Rating: (1)
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11/14/2014 9:51 AM	Rate (0)
boyn84 Posts: 21 Rating: (0)	Hi,kkllkkll Its very interesting idea! We didnt fix any faults with Exciter and didnt thought that Exciter could be a real fault reason. Simatic S7-200 fixed the initial message about fault from VFD and it was OverSpeed. Maybe we should check Exciter Log if it possible. With best Regards
boyn84 Posts: 21 Rating: (0)
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3/22/2015 6:41 AM	Rate (0)
Darrent23 Member Joined: 10/2/2014 Last visit: 11/28/2024 Posts: 9 Rating: (0)	N. Vijay hi can you elaborate the problem. I mean below 50% demand there is no tripping. Is there encoder connected to motor. Can you send the parameter backup. What mode you are running the drive OLVC , CLVC.. Regards, Vijay The problem was when I was setting the velocity from 0% to 50%, the VDF reach up the 100% and more of the DMND, after we change the SCB all fine. Now I've got another trouble but I'll put it in another post. Thanks. Best Regards Darrent

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This contribution was helpful to 1 thankful Users Min_Moderator

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