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Join our interactive web class to learn about load sharing with Yaskawa Drives, its types, advantages, applications, and setup procedures for single and multiple VFD systems. Enhance your knowledge and skills for efficient operations.
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Welcome to the Yaskawa Training Café on: Load Sharing Please help us make this Café enjoyable for all. Web Class Etiquette Tips : • Please don’t put us on “Hold”(others can hear the on-hold music) • Try not to use a speaker phone if possible (background noise can be heard by all) • Don’t be shy, we welcome comments and questions • Email us your question, if not answered during the Café to: training@yaskawa.com, or use the survey at the end of class Thank You
What is Load Sharing? The distribution of a given load over multiple motors • What Load Sharing is NOT? Electronic Line Shaft Software
Why Load Share? • Space • Improve Control • Eliminate Mechanical Components • Increase Reliability and Serviceability
Types of Load Sharing Across the Line Advantages • Inexpensive • Simple setup Disadvantages • No speed control • Cannot compensate for mechanical tolerances or wear • High inrush current Applications • Pumps • Fans • Limited mechanical
Types of Load Sharing Single VFD Advantages • Speed Regulation • Simple Startup • Soft Start Disadvantages • VFD failure shuts down the system • Cannot compensate for mechanical tolerances or wear • V/f control mode only Applications • Pumps • Fans • Limited mechanical
Types of Load Sharing Multiple VFD-Multiple MotorSpeed Master/Torque Slave Advantages • Speed Regulation • Vector control • Electronic overload Disadvantages • System tuning becomes more complex • Increase expense • Must use vector control mode Applications • Conveyors • Trains
Obstacles to Load Sharing • Mechanical coupling • Driving wheel circumference • Backlash • Normal wear & tear
Setup of Load Sharing Setup Single VFD with Multiple Motors • Provide each motor with over current protection. • Add the the FLA of all the motors and size the drive for this total. • For mechanical load sharing all motors should be the same size, type, and manufacturer. • V/f control mode only. Parameters • Set A1-02=0 V/f mode. • Set Accel and Decel rates (C1-01 & 02) others rates are available with (C1-03 thru 08). • Speed reference can be supplied via preset speeds or analog inputs.
Setup of Load Sharing Setup of a Multiple Drive System Master Drive • Motors and Drives must be matched, same model and type. • Using standard drive software one drive is selected to be the master. • Set A1-02=3, Flux vector mode. • Speed reference supplied via presets or analog. • Analog outputs defined as (1) for Speed reference (2) another for torque reference. • Decide on necessary protections required for over speed protection. • Program Accel/Decel Rate(s) (C1-01 through 08) • Tune ASR via parameters C5-01 (P Gain) and C5-02 (Integral Time 1)
Setup of Load Sharing Setup of Multiple Drive System Slave Drive • Set A1-02=3, Flux vector mode. • Set D5-01=1, Torque control • Analog input A2 programmed for torque reference set H3-09=13 • Use shielded conductors for speed and torque reference signal conductors • Practice proper wire routing to minimize induced noise on analog signals
Setup of Load Sharing Inter-connection and Parameter Setup • Setup of Multiple Drive System F7 Master F7 Slave D5-01=0 (speed mode (default)) D5-01=1 (torque mode) Fwd Run/Stop H4-01=1 2-Wire S1 FM S1 FM Spd. Ref. 1 S4 H1-01=3 SC S4 SC Spd. Ref. 2 H4-01=9 S5 H1-02=4 AM S5 AM SN SN SC SC Analog Spd. Ref. Analog Spd. Ref. For Speed Limit A1 A1 Analog Common Analog Common AC AC Torque Ref. Torque Ref. A2 H3-09=13 A2 H3-09=13
Thank you for attending a Yaskawa Training Café. • Please see our Café Schedule on the web for the next web class. (twice a month) • Complete the pop-up web survey at the end of class to help us improve.
