ABB 3BHB002953R0105 Semiconductor module

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 Ω regen resistor with four similar 12.5 Ω resistors wired in series-parallel. Series parallel wiring is two pairs wired in series (25 Ω 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 200W regen resistors wired in series parallel can handle 800W.

If the regen transistor in the drive should fail shorted

then the power into the external regen resistor will increase to far above its ratings. For three phase 240 VAC bus power, the power in the regen resistor will be about 8.2 kW (320 VDC across 12.5 ohms equals 25.6 ADC). After a few minutes, the regen resistor will typically open, but in the meantime the high heat can cause melting and damage to nearby components. A remote regen resistor mount, on top of a cabinet, can minimize the potential harm.

A single 200W 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. While not tested, analysis of fuse time-current curves indicates the following fuse should work with a single 12.5 Ω regen resistor and a drive operated on a three phase 240 VAC line: 10A, Time Delay, 250V Buss MDA 10 or Littlefuse 326010 If bus power is single phase (240 VAC, 208 VAC, or 120 VAC), regen fusing is difficult and not recommended. Fusing of high power (800W) regen is also not recommended.

                                                                        

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