ABB FIO100 Channel input card

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.A simple way to increase regen power handling capability is to replace a single 12.5 W regen resistor with four similar 12.5 W resistors wired in series-parallel. Series parallel wiring is two pairs wired in series (25 W each pair) and the two pairs wired in parallel (12.5 Ω total). Use a meter to check the resistance of a combination is 12.5 Ω before attaching it to the drive. Four 200 Ω regen resistors wired in series parallel can handle 800Ω.

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.

Common problem

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