3 Wiring and Connection3.6.2 Setting Regenerative Resistor Capacity3-423.6.2 Setting Regenerative Resistor CapacityWhen an external regenerative resistor is connected, make sure to set the regenerative resistor capacity usingthe parameter Pn600.Be sure to set this parameter when installing an external regenerative resistor to the SERVOPACK.When set to the factory setting of "0, " the SERVOPACK’s built-in resistor has been used.Set the regenerative resistor capacity within tolerance value. When the set value is improper, alarm A.320 isdetected.The set value differs depending on the cooling method of external regenerative resistor:• For natural air cooling method: Set the value maximum 20% of the actually installed regenerative resistorcapacity (W).• For forced air cooling method: Set the value maximum 50 % of the actually installed regenerative resistorcapacity (W).Example: Set 20 W (100 W × 20% ) for the 100 W external regenerative resistor with natural cooling method:Pn600 = 2 (units: 10 W)WARNING• If 0 is set to the parameter Pn600 while an external regenerative resistor is connected, the generativeoverload alarm (A.320) may not be detected. If the generative overload alarm (A.320) is not detected cor-rectly, the external regenerative resistor may be damaged and an injury or fire may result.Regenerative Resistor CapacityPn600 Setting Range Unit Factory Setting When Enabled0 to SERVOPACKcapacity 10 W 0 Immediately1. When the external regenerative resistors for power are used at the rated load ratio,the resistor temperature increases to between 200 °C and 300 °C. The resistors mustbe used at or below the rated values. Check with the manufacturer for the resistor’sload characteristics.2. For safety, use the external resistors with thermoswitches.
