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braking resistance:

Created by: seaf at: 5/9/2011 4:55 PM (7 Replies)

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8 Entries

5/9/2011 4:55 PM	Rate (0)
seaf Posts: 28 Rating: (1)	HI......... what the difference between the 3 type of braking resistance: 1-single. 2-comman. 3-regenerative thanks in advance
seaf Posts: 28 Rating: (1)	Last edited by: seaf at: 5/9/2011 4:56 PM
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5/24/2011 5:06 PM	Rate (1)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 8/5/2024 Posts: 1976 Rating: (477)	Well I dont know exactly what you are talking but following is my opinion.. Single- It is single Breaking Resistor used for individual drive. I mean one DBR for one Drive Common: If you have several drives, you can connect to one common DBR but ofcorse its rating should be taken care of Regenerative: Its not actualy Breaking Resistor but Normaly regenerating power given bact to supply by use of RRU or similar to that... I hope this is what you want... Correct me if I am wrong here..
	I dont Like people driving Fast, thats the reason I overtake them ;)
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This contribution was helpful to 2 thankful Users @nkur Chetan2490

5/29/2011 4:32 PM	Rate (0)
Ahmed Experienced Member Joined: 2/20/2007 Last visit: 6/11/2024 Posts: 122 Rating: (2)	Hello I have not heard about braking resistance of regenerative type Braking resistor is only used so that energy can be dissipated through it during braking to acheive the ramp down time. Am I correct? Ahmed

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5/29/2011 5:25 PM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 8/5/2024 Posts: 1976 Rating: (477)	Yeah thats what I told... You mean Regenerative Breaking but its not Resistor.. Vithani Regenerative: Its not actualy Breaking Resistor but Normaly regenerating power given bact to supply by use of RRU or similar to that...
	I dont Like people driving Fast, thats the reason I overtake them ;)
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5/23/2014 8:14 AM	Rate (0)
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	Ahmed Hello I have not heard about braking resistance of regenerative type Braking resistor is only used so that energy can be dissipated through it during braking to acheive the ramp down time. Am I correct? Ahmed Yes Correct, Braking resistors are used on AC variable frequency drives (VFD's) to dissipate energy that is produced in the motor as the drive provides braking torque to stop the motor. braking resistor is connected to the DC bus and will see voltages as high as 800 volts during braking conditions.

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5/23/2014 9:06 AM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 6/29/2023 Posts: 508 Rating: (23)	Ahmed Hello I have not heard about braking resistance of regenerative type Braking resistor is only used so that energy can be dissipated through it during braking to acheive the ramp down time. Am I correct? Ahmed Regenerative braking feeds the current produced during braking back into the power supply system, instead of being wasted as heat. In drives, there is a sperate component is used generally termed as Regenerative Unit RRU as mentioned by Vithani. Many other things also needs to be considered to have this option as its costlier than typical braking resistor, additional installation unit etc.,

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5/23/2014 1:18 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 10/25/2024 Posts: 307 Rating: (15)	regenerative braking or dynamic braking depend on the amount of DC component of MMF(magnetic motive force ) to stop the motor without any practical resistor by feeding DC current in reverse with the original ac current induced in the motor windings

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5/23/2014 2:19 PM	Rate (0)
jeet2907 Posts: 235 Rating: (52)	seaf HI......... what the difference between the 3 type of braking resistance: 1-single. 2-comman. 3-regenerative thanks in advance Any dynamic braking operation required for the motor can be realized by means of braking DC chopper and resistor shunt connected across the rectifier. Alternatively, an anti-parallel thyristor bridge must be provided in the rectifier section to feed energy back into the AC line. Such phase-controlled thyristor-based rectifiers however have higher AC line distortion and lower power factor at low load than diode-based rectifiers.
jeet2907 Posts: 235 Rating: (52)
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