Installation ASDA-B3 When the regenerative energy exceeds the capacity of the built-in regenerative resistor, use an external regenerative resistor. Pay special attention to the following when using a regenerative 2 resistor: 1. Choose the correct resistance value (P1.052) and capacity (P1.053) for the regenerative resistor; otherwise it might affect the performance. 2. When using an external regenerative resistor, ensure the total resistance value is greater than the minimum allowable resistance value of the servo drive. For general applications, you can connect more than one resistor in series.
If the value from resistors connected in series exceeds the rated range, you can reduce the value by connecting the resistors in parallel. If you want to connect the resistors in parallel to increase the power of the regenerative resistors, make sure the resistance value meets the requirements. See the following diagrams and settings for connecting the regenerative resistors in series and parallel. 3. Normally, if the capacity of the regenerative resistor (the average value) is within the rated capacity, the temperature can increase to 120°C (248°F) or even higher (under the condition that the regenerative energy continues to function).
For safety reasons, apply forced cooling to reduce the temperature of the regenerative resistor. Alternatively, you can use regenerative resistors equipped with thermal switches. Contact the manufacturer for the load characteristics of the regenerative resistor. 2-18 Connect to one external regenerative resistor P 1 kW, 10Ω C P1.052 = 10 (Ω) P1.053 = 1000 (W) Connect to external regenerative resistors (serial connection) P 1 kW, 10Ω 1 kW, 10Ω C P1.052 = 20 (Ω) P1.053 = 2000 (W) Connect to external regenerative resistors (parallel connection) P 1 kW, 10Ω 1 kW, 10Ω C P1.052 = 5 (Ω) P1.053 = 2000 (W)