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Goals and Symptoms
Would braking resistor get warm even when ATV28 is merely at "rdy" state ? Is it in normal condition? (If braking resistor's specification is well fitted with its cooperated ATV28, and it is also in good condition without any insulation problem.)
Causes and Fixes
On the ATV28 the braking transistor switch on the resistor following the DC bus value just before Overvoltage fault. But in this case, the network is superior to the limit.