MOTOROLA MVME51005E-0161 Analog output card

Customer-Supplied Regen Resistors Customer-supplied regen resistor(s) can be used. Be sure the resistance seen by the drive is within 10% of 12.5 Ω and the isolation of the resistive element is a minimum of 1,500 V. Two 25 Ω resistors in parallel form a 12.5 Ω resistor. High Power Regen In an application with very high average regenerated power, it may be necessary to increase the wattage of the regen resistor. Quick test: ‘Does water boil on the surface of the resistor’. One way to increase the regen resistor power handling capability is to blow air on it.

Fusing 

If the regen transistor in the drive should fail shorted, the power into the external regen resistor increases far above its ratings. For three phase 240 VAC bus power, the power in the regen resistor is about 8.2 kΩ (320 VDC across 12.5 Ω equals 25.6 ADC). After a few minutes, the regen resistor typically opens. In the meantime, the high heat can cause melting and damage to nearby components. A remote regen resistor mount, away from other structure say on top of a cabinet, minimizes the potential harm. A single 200 Ω regen resistor can (in some cases) be fused, but the fuse type and rating must be carefully chosen. Due to the resistance a large pulse of current is not available to clear a fuse.

                                                                        

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