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Thread: concept of braking in VFDs

  1. #21
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    That ABB drive does have the chopper already installed.

  2. #22
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    The "R1, R2" refer to the FRAME SIZES of that drive. In that cart, Frame Sizes R1 and R2 have terminals marked BRK+ and BRK- that are used to terminate the wires for the braking resistor because the brake CHOPPER is on-board those two frame sizes.

    But if you are using Frame Sizes R3 or R4 (actually any size ABOVE R2), they do NOT have the Brake Chopper included in the drive, so they give you DIFFERENT terminal numbers, UDC+ and UDC-, for connecting a braking CHOPPER, or a Braking Module that is the chopper + resistors together. Here is what it explains to you in a later portion of the manual, entitled "Brake Components (page 295 of the verion I have)"

    Availability
    Braking availability for ACS550 drives, by frame size is:
    • R1 and R2 – a built-in brake chopper is standard equipment. Add appropriate
    resistor, as determined using the following section. Resistors are available from
    ABB.
    • R3...R6 – does not include an internal brake chopper. Connect a chopper and a
    resistor, or a brake unit to the DC link terminals on the drive. Contact your ABB
    representative for appropriate parts
    You did not indicate what size of VFD you are looking at, so we have no idea of knowing whether your drive does or does not have a brake chopper already.

    In no case does the ACS-550 offer Line Regenerative Braking options though. For that, you must order the ACS 800, and there is a specific "variant" that you must also specify to get it. I can't remember, but I think it is variant "14" maybe?
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  3. #23
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    Quote Originally Posted by Jraef View Post
    The "R1, R2" refer to the FRAME SIZES of that drive. In that cart, Frame Sizes R1 and R2 have terminals marked BRK+ and BRK- that are used to terminate the wires for the braking resistor because the brake CHOPPER is on-board those two frame sizes.

    But if you are using Frame Sizes R3 or R4 (actually any size ABOVE R2), they do NOT have the Brake Chopper included in the drive, so they give you DIFFERENT terminal numbers, UDC+ and UDC-, for connecting a braking CHOPPER, or a Braking Module that is the chopper + resistors together. Here is what it explains to you in a later portion of the manual, entitled "Brake Components (page 295 of the verion I have)"



    You did not indicate what size of VFD you are looking at, so we have no idea of knowing whether your drive does or does not have a brake chopper already.

    In no case does the ACS-550 offer Line Regenerative Braking options though. For that, you must order the ACS 800, and there is a specific "variant" that you must also specify to get it. I can't remember, but I think it is variant "14" maybe?
    that means acs550 do not have provision of regenerative braking, and acs800 has.

  4. #24
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    Jun 2018
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    Jharkhand, India
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    Can anyone please give me study material for ac drives in which topics such as construction, working principle, components used.
    and more details such as how much voltage DC bus has during motoring and braking process for a 3 phase 415VAC.

    and how much threshold voltage is set in DC bus beyond which extra energy is dissipated.

    I have ABB manual but dont have such details in it.

  5. #25
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    Quote Originally Posted by Abhi View Post
    Can anyone please give me study material for ac drives in which topics such as construction, working principle, components used.
    and more details such as how much voltage DC bus has during motoring and braking process for a 3 phase 415VAC.

    and how much threshold voltage is set in DC bus beyond which extra energy is dissipated.

    I have ABB manual but dont have such details in it.
    A good undzerstanding of induction motors is a good place to start from. I guess I was lucky in that my lecturer on machine theory was a motor designer in a previous life.
    This from AB on PWM inverters might help:

    http://literature.rockwellautomation...p002_-en-p.pdf
    Si hoc legere scis nimium eruditionis habes.

  6. #26
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    A ABB drive with model no: acs800-04-0210-3+P901+D150+N652 which is installed in crane for main hoist of capacity 100 ton
    so i want know which card is used for what and its uses. i have enclosed few pictures of the card

    And another question is that what is "watchdog" in drive and for what purpose it is used?
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    Insearch of clear concepts

  7. #27
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    Quote Originally Posted by Abhi View Post
    A ABB drive with model no: acs800-04-0210-3+P901+D150+N652 which is installed in crane for main hoist of capacity 100 ton
    so i want know which card is used for what and its uses. i have enclosed few pictures of the card

    And another question is that what is "watchdog" in drive and for what purpose it is used?
    You would need to address the question about what the cards are for to an ABB engineer or someone trained on them. I have designed just a few systems with them but none in recent years. Mostly we used Vacon, a company started by some e-ABB guys.

    A watchdog is often a drive health check but maybe a different function on ABB drives.

    Sorry - not much help on those Q's
    Si hoc legere scis nimium eruditionis habes.

  8. #28
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    Quote Originally Posted by Besoeker View Post
    You would need to address the question about what the cards are for to an ABB engineer or someone trained on them. I have designed just a few systems with them but none in recent years. Mostly we used Vacon, a company started by some e-ABB guys.

    A watchdog is often a drive health check but maybe a different function on ABB drives.

    Sorry - not much help on those Q's
    I agree with Besoeker here, you are now in the area of needing help from the manufacturer, not the kind of generalized help we can offer you from here. Please seek further assistance from your ABB contacts.
    __________________________________________________ ____________________________
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  9. #29
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    Quote Originally Posted by Jraef View Post
    I agree with Besoeker here,
    Thank you Mr Mod.
    We try.
    Si hoc legere scis nimium eruditionis habes.

  10. #30
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    Quote Originally Posted by Abhi View Post
    A ABB drive with model no: acs800-04-0210-3+P901+D150+N652 which is installed in crane for main hoist of capacity 100 ton
    so i want know which card is used for what and its uses. i have enclosed few pictures of the card

    And another question is that what is "watchdog" in drive and for what purpose it is used?
    Generically, a "watchdog" circuit is a fail safe output that changes state when the control or output circuitry or program is not working properly. In processor-based systems it is often used to hard reset the processor in the hope of recovering from a glitch or bug. In the case of a drive, it is likely to indicate that it is not safe to rely on the drive.

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