3.9 Selecting and Connecting a Regenerative Resistor Unit3-333 Wiring and Connection• For natural convection cooling: Set the value to a maximum 20% of the actually installed regenerativeresistor capacity (W).• For forced convection cooling: Set the value to a maximum 50% of the actually installed regenerativeresistor capacity (W).Example: Set 20 W (100 W × 20%) for the 100-W regenerative resistor unit with natural convectioncooling method:Pn600 = 2 (unit: 10 W)3.9.4 Installation StandardsObserve the following installation standards when you use a regenerative resistor unit specified by Yaskawa.Provide at least 70 mm on each side of the unit and at least 200 mm at both the top and bottom of the unit toenable fan and natural convection cooling.If you use a non-specified regenerative resistor unit, follow the specifications of the regenerative resistor unitwhen you install it.• When the regenerative resistor unit for power are used at the rated load ratio, theresistor temperature increases to between 200°C and 300°C. The resistors must beused at or below the rated values. Check with the manufacturer for the resistor’s loadcharacteristics.• Set the regenerative resistor capacity in parameter Pn600 of the multi-winding driveunit. Do not mistakenly change the SERVOPACK parameter.70 min. 70 min.200 min. 200 min.MountingdirectionUnits: mmUp
