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DC bus link voltage

Created by: H.J.R at: 3/27/2012 1:12 PM (3 Replies)

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3/27/2012 1:12 PM	Rate (0)
H.J.R Posts: 129 Rating: (0)	whenever using a SINAMICS S drive, dc bus link voltage power will give to drive....why??????
H.J.R Posts: 129 Rating: (0)	Last edited by: janardhan at: 3/27/2012 1:13 PM
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3/28/2012 9:02 AM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 1/22/2025 Posts: 5985 Rating: (824)	Hello, please explain your question a little more detailed.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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4/24/2012 7:13 AM	Rate (1)
Mothilal Posts: 165 Rating: (25)	hello I could not get ur point... Anyway I will explain little bit about dc bus.. Normally all the AC drive system are provinding the Variable Voltage and Variable Frequency to the motor for speed control and torque control purpose.. This variable voltage and variable frquency can be achieved by proper switching of the semiconductor switches(say example IGBT) in the inverter part of your drive. we have a three phase AC supply voltage with fixed frequency of 50 Hz (in india) and rms voltage of 415V. From the three phase power supply, you cannot get the varibale voltage and variable frequency directly (except cyclo converter).. So you need to convert the AC voltageof fixed frequency to DC voltage. This work is done by BLM(BASIC LINE MODULE), ALM (Active Line Module) and SLM(Smart Line Module). Thismodule is the rectifying part of your drive. It Converts the 415V AC , 50 Hz supply to 600V DC (0 Hz frequency). The rectifying output cannot be the pure dc voltage. It contains the ripple content (presence of AC component in you DC Voltage is called ripple). So you must choose the proper filter to maintain the dc voltage at 600V . The DC LINK capacitor do this job. It maintains the fixed dc voltage in the dc link. (you should not touch the dc link immediatelyafter power off. You should wait atleast 5 min . because the capacitor takes some times to discharge its dangerous voltage) This DC voltage is input to your drive inverter section. The inverter section is nothing but your Motor module. The Motor module converts the fixed dc voltage to variable voltage and variable frequency (you can vary the both magnitude and frequency). TheMotor module has a power electronic switching device for inverting purpose(DC to VVVF AC).. This variable voltage and variable frequency is given to motor. By this way you can get variable speed and torque from the motor.. In short: AC supply 415V,50Hz----> rectifier---> 600V DC(DC LINK)----> INVERTER-----> to MOTOR Regards Mothilal
Mothilal Posts: 165 Rating: (25)
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This contribution was helpful to 2 thankful Users PISCEAN 2010 qayyum faiz

4/28/2012 8:29 AM	Rate (0)
timmyLDeng Regular Member Joined: 8/25/2011 Last visit: 12/13/2024 Posts: 29 Rating: (4)	Sinamics S range do not come with a built in recifier. The G range is AC to AC. You have to buy a seperate recifier ( Infeed) for the S range.

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This contribution was helpful to 1 thankful Users qayyum faiz

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