FAQ: How do I add external regenerative resistors?
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First, it is important to add a regenerative resistor with the proper resistance. Otherwise, damage to the ServoPack and/or poor performance may result. Please refer to the table in Section 5.6 of the Sigma II User's Manual [YEA-SIA-S800-32.2] for the minimum allowable resistance for each ServoPack model (see attachment below also). The user's manual also discusses calculating regenerative energy capacity.
Once the amount of regenerative capacity has been determined, a resistor must be acquired to satisfy the requirements. Yaskawa offers a range of resistor pack units, and while they are designed and wired to work with particular sized ServoPacks, they can be rewired/reconfigured to work most any unit. Please reference the attached document for configuration and wiring details.
Once a resistor has been acquired, it is connected between terminals B1 and B2 of the SGDH ServoPack. Be sure to remove the jumper between B2 and B3 (applicable to ServoPacks between 500W to 5.0kW).
Now the external regenerative resistor's useable capacity must be calculated. There are two general variations to this:
1) Natural Convection Cooling.
About 20% of convection cooled resistor's capacity may be used. For example, if a resistor has a nameplate value of 1000 watts, the maximum usable capacity is 1000Watts * 20% = 200 Watts (assuming natural convection cooling). This limitation is generally specified by the resistor manufacturer to insure high MTBF, so be sure to verify the capacity reduction in your specific operating environment.
2) Forced Air Cooling.
About 50% of a forced air cooled resistors capacity may be used. For example, if a resistor has a nameplate value of 1000 watts, the maximum usable capacity is 1000Watts * 50% = 500 Watts (assuming forced air cooling).
Lastly, the value for Parameter PN-600 (Regenerative Resistor Capacity) must be calculated and input. PN-600 is in units of 10W, so the above calculated valued must be divided by 10 and the result is input for PN-600. For the two examples above:
PN-600 = (200/10) = 20, natural convection cooling
PN-600 = (500/10) = 50, forced air cooling
Attached Files:
99004a.pdf is external regen specifications for the Sigma II amplifier product. It outlines the minimum value resistor rating required for a particular model number and how to use/rewire the JUSP-RA04, 05, 18, 19 resistor packs to match that rating.
Troubleshooting info
Note: If an A.40 alarm (overvoltage) appears, it could be due to too much instantaneous power regeneration. A remedy could be to lower the resistance value of the shunt regen resistor (but be sure not to go below min rating).
Note: If an A.32 alarm (Regeneration overload) appears, the RMS regen dissipating capacity must be increased. This alarm is governed through the Pn-600 setting)
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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