7/26/2024 1:59 AM | |
Joined: 12/21/2017 Last visit: 8/15/2024 Posts: 2 Rating:
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Hi all we are using 6ra7015 to supply a DC generator field to control the generator , the generator voltage is controlling the speed of 2 dc motors connected in series , the motors field is connected in series too through a separate supply . the application is crane slewing system . the problem is that when we run the motors the go over speed and with high current that the generator trip , i checked every part of the system and found nothing faulty . as we are in urgent situation and to over come my problem i had reduced the output voltage of the drive to the generator field to the minimum value i can also i change the speed reference to about 2 % . this way the motors current is about 98% . wish one can help investigate the problem and how to solve . motors field current were measured and found ok , there is no generator voltage feedback connected to the drive ,only tacho and motor aramature current , insulation , brushes and commutator found ok . the problem exist even the motors are decoupled from the gearboxes . attached the dnl file AttachmentTB_SLE_GenField_4A11_V02.zip (14 Downloads) |
Last edited by: abdo1966 at: 07/27/2024 13:07:41 |
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