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Post by Mitch on Mar 19, 2015 19:30:24 GMT
I'm curious about how many people are using dynamic braking resistors - so I've created a poll. It's not as clear as it could be.
Find your VFD from the 3 options Select 'yes' or 'no' for braking resistor
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Post by vulbas on Mar 22, 2015 15:47:24 GMT
i use breaking resistor with omron j1000
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Post by clyevo on May 8, 2015 11:22:28 GMT
From the poll it seems everyone is using braking resistor
1) There is a DC capacitor to collect all the regenerative power from the motor. What happens if we dont use braking resistor. Overvoltage error because high capacitor voltage? This will lead us to set a long deceleration time in VFD settings?
2)I read somewhere that it is possible to use this regenerative power by means of transferring it to the other VFD. How can we do this? Is it good enough to be significant in reduction of electricity consumption?
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Post by misoswan on Jun 23, 2015 14:47:24 GMT
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Post by tronicgr on Jun 24, 2015 12:35:00 GMT
Hmm, the 200Watt doesn't look enough, and I'm not sure about the resistance that is needed from the SEW inverter. Perhaps vicpopo can validate that the value (ohms) is enough as he is using SEW inverters as well. Thanks
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Post by clyevo on Jul 1, 2015 3:00:42 GMT
the recommended resistance (ohm) depends on the model of the inverter drive and the rated power (kw) and usually are mentioned in the product manual, the watt usually are also mentioned in the product manual but if you are meticulous you can calculate yourself : motionsim.freeforums.net/post/1434P=VxV/R if you using 230 volts and if you use 100ohm braking resistor The wattage you would need is 230x230/100 = 529w So 200 watt is too far less, its ok for the watt to be less but if too less then the heat dissipation will be slower, and braking will be slower as well
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