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| 1/7/2011 7:56 PM | |
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Posts: 9 Rating:
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We (I IS MT Mining) are in process of commissioning High Speed Conveyors for one of our customers M/S MPSEZL in India. For this application we have supplied SINAMICS S120 Drives with Performance extension CF card. The configuration diagram is attached herewith for your reference, pl. refer page 3 of 3.There are total 4 motors are on one transformer. Each motor is driven by one MoMo which is getting DC bus from two parallel BLMs ( 12 Pulse configuration). Each CU controls two BLMs and one MoMo. There are 2 nos of 250KW motors for one conveyor and 2 nos of 800KW motors for other conveyor.The system voltage is 690V AC and the measured voltage is in the range of 675V to 698V AC.The neutral of the secondary Star winding is kept floating as suggested in the Engineering Manual.System requires first ON command to BLMs( 2x250KW) of 250KW motor and then to BLMs( 2x560KW) of 800KW motors. During starting when we give ON command to both the BLMs of 250 KW simultaneously (in 12 pulse configuration) the BLMs starts without any problem. But when we next ON command to both BLMs of 560KW, BLMs of 250KW trips on the Over Voltage fault (F 30002) even though there is no load connected to the BLMs and the MOMO is in off condition. On trace function when we measured the voltage it is crossing 1240V DC even though the incoming voltage is just 680V AC.When we start first 560KW BLMs and then 250KW, it works ok.Also when we start all 8 BLMs, it work fine.We have removed all neutral earthing also inside panel of metering transformer along with the connection bracket for the interference-suppression capacitor inside BLM.Individually any BLM work fine.We are not able to pinpoint the reason for this tripping. As the things are very urgent at site, we request for your expert opinion about what might be causing this problem and how to overcome it.
AttachmentCopy of 01_Mundra Drives System Configuration.pdf (72 Downloads) |
| 3/21/2012 12:12 PM | |
Joined: 3/2/2007 Last visit: 11/8/2023 Posts: 895 Rating:
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hy sir, how did you solve this? thank you |
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... thank you ... |
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