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IndustryArena Forum > CNC Electronics > Servo Motors / Drives > What is the catch with those JMC servo IHSV60-30-40-48
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  1. #21
    Join Date
    Nov 2013
    Posts
    4280

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    Hi,
    this a quote (mangled) from a supplier:

    'There is always a manufacturer somewhere prepared to produce an item cheaper but of lesser quality. People who buy on price alone
    are that manufacturers legitimate prey'

    Craig

  2. #22
    Join Date
    Mar 2003
    Posts
    35538

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    DMM's are 3x the price, which can make a huge difference for a hobbyist.

    I'd seriously consider these, but there are a few issues for me.

    You need a DC power supply with a lot of current. I'm guessing the peak current is around 20 amps each. But DMM uses a single 20 amp power supply with 3 DYN2 drives, so I'm thinking a 48V 30 amp supply should work for 3 motors?
    This adds about $200-$250 to the cost of the motors vs AC drives

    You need to run your step dir signals all the way to the drives. But there's no encoder cables, so it's a wash.

    1000 line encoders? Not sure how they can get 40,000 steps out of these, unless they are just using electronic gearing? This makes no sense. But I'm not sure if it would be an issue on a router?

    The manual mentions keeping them away from dust. Not sure how important this is, but it definitely might be an issue on a router.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #23
    Join Date
    Mar 2017
    Posts
    411

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    It has been my experience that you get what you pay for. Good hardware is never the cheapest. One also has to consider the value of one's time in the cost equation. Whenever I have taken the low cost route, it has resulted in an outcome that required more of my time debugging, fighting with a vendor over a return, or just having to put in more effort to get the outcome that I wanted.

    However, if you are willing to trade your effort for something that is innovative, risky, and maybe a lower $ cost, there are options. Take a look at ODrive Robotics. They have a device that turns a brushless DC motor into a servo.

  4. #24
    Join Date
    Dec 2006
    Posts
    86

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    I ordered a pair for a benchtop lathe project.

    I'll be hooking them up hopefully in January when all of the parts get here. Belt reduction parts, servos and power supply.

    They require 7.5 Amps each, plus/minus, so I ordered an Antek torroidal power supply. About 130$, but I'd be using a 90$ one from them for a stepper machine. Not a big price difference.

  5. #25
    Join Date
    Mar 2003
    Posts
    35538

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    Peak Current is ~ 20 amps.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  6. #26
    Join Date
    Dec 2006
    Posts
    86
    Quote Originally Posted by ger21 View Post
    Peak Current is ~ 20 amps.
    You don't have to supply peak current. You have to supply 7.5 amps.

  7. #27
    Join Date
    Mar 2003
    Posts
    35538

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    What happens when the drive tries to supply 20 amps to the motor, during acceleration?
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  8. #28
    Join Date
    Dec 2006
    Posts
    86
    Quote Originally Posted by ger21 View Post
    What happens when the drive tries to supply 20 amps to the motor, during acceleration?
    It will come from the capacitors and overloading the transformer. Not an issue if you are not operating at peak accelerations on both motors constantly. It also helps to use a high quality power supply, which is why I use the Anteks.

    If I'm wrong I just buy another transformer and use one for each motor.

    https://www.electronicdesign.com/technologies/electromechanical/article/21751588/powersupply-considerations-for-servo-amplifiers

  9. #29
    Join Date
    Jan 2005
    Posts
    15362

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    Quote Originally Posted by dan_the_welder View Post
    You don't have to supply peak current. You have to supply 7.5 amps.
    You will need to have a supply that can output up to 20A and around a 1000Watts for 3 + 1 motors, the motors will run on a lower power supply but will not be able to reach there max power output and may fault out when trying to get max power
    Mactec54

  10. #30
    Join Date
    Jan 2005
    Posts
    15362

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    Quote Originally Posted by ger21 View Post
    What happens when the drive tries to supply 20 amps to the motor, during acceleration?
    If it can't ramp up and reach what you are asking it to do, it will fault out normally if the servo drive has any safety features
    Mactec54

  11. #31
    Join Date
    Mar 2018
    Posts
    68

    Re: What is the catch with those JMC servo IHSV60-30-40-48

    Dan! Keep us informed on how they are doing!

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