GS20(X) VFD: Overvoltage Protection at AutomationDirect

www.AutomationDirect.com/driv... (VID-DR-0136)
- Learn how to use the G20(X) family if Variable Frequency Drives built in Over voltage protections. Well walk through how each method works with live examples, because once see it in action, everything suddenly becomes clear and you can feel confident you are maximizing the drives performance.
To learn more, check out our video library for lots of how to videos including PID, Torque Mode, using the FREE software, PLC programming and more!
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**Prices were valid at the time the video was released and are subject to change.
Related AutomationDirect.com part numbers: GS21-10P2, GS21-10P5, GS21-11P0, GS21-20P2, GS21-20P5, GS21-21P0, GS21-22P0, GS21-23P0, GS23-20P2, GS23-20P5, GS23-21P0, GS23-22P0, GS23-23P0, GS23-25P0, GS23-27P5, GS23-2010, GS23-2015, GS23-2020, GS23-40P5, GS23-41P0, GS23-42P0, GS23-43P0, GS23-45P0, GS23-47P5, GS23-4010, GS23-4015, GS23-4020, GS23-4025, GS23-4030, GS23-51P0, GS23-52P0, GS23-53P0, GS23-55P0, GS23-57P5 ,GS23-5010 ,GS21X-20P5 ,GS21X-21P0 ,GS21X-22P0 ,GS21X-23P0 ,GS23X-20P5 ,GS23X-21P0 ,GS23X-22P0 ,GS23X-23P0 ,GS23X-25P0 ,GS23X-27P5, GS23X-40P5, GS23X-41P0, GS23X-42P0, GS23X-43P0, GS23X-45P0, GS23X-47P5, GS23X-4010, GS20A-KPD, GS20A-BPS, GS20A-N1A1, GS20A-N1A3, GS20A-N1B, GS20A-N1C, GS20A-N1D, GS20A-N1E, GS20A-N1F, GS20A-FAN-A, GS20A-FAN-B, GS20A-FAN-C, GS20A-FAN-D, GS20A-FAN-E, GS20A-FAN-F, GS20A-ESP-A, GS20A-ESP-B, GS20A-ESP-C, GS20A-ESP-D, GS20A-ESP-E, GS20A-ESP-F, GS20A-DR-AB, GS20A-DR-C, GS20A-MP-AB, GS20A-MP-C, GS20A-CAPF, GS20XA-DSA, GS20XA-DSB, GS20XA-DSC, EMF10AM23A, EMF11AM21A, EMF12AM43B, EMF23AM43B, EMF24AM23B, EMF27AM21B, EMF33AM23B, EMF6A0M43A, EMF6A0M63B, EMF16AM63B, GS20XA-EPA, GS20XA-EPB, GS20XA-EPC, GS20XA-FAN-B, GS20XA-FAN-C, GS20A-CM-ENETIP, GSOFT2, GSLOGIC

[@beckyschwantes5287]

This is actually an impressive drive line. I have a gs20 driving a 5hp 3p motor and large air compressor. I was very impressed with the parameter functionality and the options for digital I/O

[@automationdirect]

Thanks Becky, This is probably my favorite of all the ones we offer ...
BTW - Are you aware that we have a LOT of videos showing you how to use the GS20's and all of our other drives too? Check it out here:
www.AutomationDirect.com/videos (Random Search)
www.AutomationDirect.com/Cookbook (By subject)

[@beckyschwantes5287]

@@automationdirect yes I watched them and I have been studying the manual. I want to enable the 3 wire start stop function in the drive but I can’t tell if the drive will latch the start for me or if I need to create a latch via relay. Also I would like to incorporate a hand off auto so I can manually start motor via push button or run in auto via control by pressure switch input. I also want the drive to output when it’s in an alarm state and whe the run command is active so I can have a couple status lights. I think I got the output figured out . I see a parameter for hand off auto mode but I think it’s more for manual operation via hmi. Also I’m going to mount the keypad on the enclosure but the shortest cable they offer is 3 feet long!!!! I can’t coil all that up and build a pretty box. Can you all make me a short cable?

[@electromechanicalstuff2602]

What about trying to start it while it's decelerates? Will that cause over the voltage?

[@adcpreviews1727]

Typically, if the motor will stop without overvoltage then the restart will not cause it.

[@disun4152]

Hello Thank you for wonderful video. I have a GS23-55P0 of 5HP driving a 3HP 3-PH 575VAC motor. the motor is for a small stamping press with flywheel. I got the OVN fault (over-voltage during normal constant speed). Can you tell me what I should do about that ? Increasing deceleration time will help to solve the problem ? I just bought it today. The drive is brand-new. Is it a suitable using 5HP VFD for a 3HP motor ? Thank you

[@automationdirect]

@disun, does the OVN occur when the flywheel is disengaged? If so, take a look at a braking resistor to absorb the reverse EMF. If it is not, try contacting our FREE award-winning technical support team for further assistance specific to your application.
community.automationdirect.com/s/contactsupport?BJh48mxezY&VideoTeamComment

[@wadib3eed7]

I am confusing about how induction motor at deceleration time regenerate electrical energy!, because the stator is windings and the rotor is just a core. I mean there is no magetic parts inside to generate electric currents. So if i take digital mutimeter and make a simple experiment to measure the output voltage from the motor at deceleration time and suppose the dec = 6 sec, the question is, any output voktage will be when take reading by digital voltmeter? I have 18 kw 3 phase induction motor 380 AC connected to vfd and measured any output volt when stoped but nothing. So i am confusing about that issue.

[@automationdirect]

Hi Wadi, That's a really good question and one that most folks don't think about (and the video over simplifies).
When the VFD applies it's output waveform to an induction motor, it creates a magnetic field around the rotor. In a 60 Hz system and a four pole motor the rotating field moves at 60Hz x 30 sec/min = 1800 RPM.
1800 RPM is called the "synchronous speed" and if the rotor actually turned at 1800 rpm, then the rotor and field are in sync.
But in normal operation the rotor spins slower then that, usually 1725 rpm or so. This difference, called the slip, creates a current in the rotor which is what generates the torque. The larger the slip, the more torque (up to a point).
So when you apply a load like braking or just try to slow the motor down too fast, it creates a large difference between the established field frequency and the rotor speed, which creates current which is forced back into the drive capacitors and builds up the voltage.
Does that help?

[@wadib3eed7]

@@automationdirect @AutomationDirect.com
I think i have another explanation.
I noteced from your video, the overvoltage happened in a very short time (m. sec) and the Gsoft2 showed that, and can not catche it easily by digital multineter. It is just a spike. So i am thinking, we can consider the motor as a big inductor with a big core, when AC is applied to the inductor, an EMF will build up and a few seconds a electomagnetic field built in inductor(stator), when applied AC removied, the electromagnetic field stored in the inductor(stator) will resist the new case and large currents will be back into the intire circuits of the drive. The IGBTs will face a reversed current and volts and sone diodes in parallel will transistors will be in reverse biasing, if the revese biasing so big, then the IGBT will be damaged very fast. For this reason the dynamic resistor do as a bypassing the huge current and absorb the spikes built by the EMF.
This is my explaination, so is it right or not.?

[@wadib3eed7]

@@automationdirect what do you think about my explanation?

[@automationdirect]

Yep, sounds like you have a good feel for what is going on!

[@automationdirect]

Yep, sounds like you have a good feel for what is going on!