10.07.2015 Views

Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

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6.5 Connecting Regenerative Resistors6.5 Connecting Regenerative Resistors6.5.1 Regenerative Power and Regenerative ResistanceThe rotational energy of driven machine such as servomotor is returned to the SERVOPACK. This is calledregenerative power. The regenerative power is absorbed by charging the smoothing capacitor, but when thepower exceeds the capacitor’s chargeable energy, the regenerative power is further consumed by the regenerativeresistor.The servomotor is driven in regeneration state in the following circumstances:• While decelerating to a stop during acceleration and deceleration operation.• Continuous falling operation on the vertical axis.• During continuous operation with the servomotor rotated from the load side (negative load).The SERVOPACKs with a capacity of the single-phase 200 V with 30 to 400 W or 100 V with 30 to 200 W donot have built-in regenerative resistors. If the operation exceeds the rotating speed specifications shown in the4.5.3 Load Moment of Inertia, connect an external regenerative resistor.6.5.2 Connecting External Regenerative Resistors(1) Necessity of External Regenerative ResistorsSERVOPACKCapacityNecessity ofExternal RegenerativeResistorsExplanation400 W or less Not Required No built-in regenerative resistor is provided, however, normally an externalregenerative resistor is not required.Install external regenerative resistors when the smoothing capacitor in SER-VOPACK cannot process all the regenerative power.500 W to 5.0 kW Not Required A built-in regenerative resistor is provided as standard. Install external regenerativeresistors when the built-in regenerative resistor cannot process all theregenerative power.6.0 to 15.0 kW Required No built-in regenerative resistor is provided, so the external regenerativeresistor is required. If the external regenerative resistor is not connected withthe SERVOPACK, the alarm30 is detected as a regeneration error alarm.66-33

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