Failure model: ACS600 ABB

Fault causes: running over voltage trip

Fault analysis: customer inverter in chemical equipment, inverter equipped with braking chopper and brake resistor, the chopper and resistor input in the test circuit of DC overvoltage tripping, the more frequent trip. Operation manual of inverter DC circuit overvoltage explanation usually has 2 points: a) into the line voltage is too high; b) deceleration time is too short; that in the use of voltage feedback current controller to prevent overvoltage DC circuit under the condition that the rate of change of the load current is too large is an important cause of overvoltage, to the scene to see controlled equipment, found a gap in the belt material card, after the removal of the inverter, normal. Open the converter shell inspection, found with a third gear brake chopper on line voltage selection device (400V, 500V, 690V) in order to adapt to the different input voltage, the short circuit ring is inserted in the 690V file, thus causing the threshold braking chopper and braking resistance value is too high to work in the line voltage did not play a role in ACS600 400V, the short circuit ring to the 400V file, by reducing the deceleration time test, braking chopper and braking resistance normal work. In the mixing process, because the line voltage is too high, DC voltage exceeds the preset limit, when decelerating voltage regulator function, the braking current is very small, the motor speed does not drop down, and the power grid in chemical mixing increased the load, DC voltage of less than 115% of the limit set value, braking function return to normal. At that time can not reduce the power grid voltage, the DC circuit voltage limit to 127% after the set value, the inverter is working properly. In the maintenance of production, we have changed the transformer according to the situation of the power grid, so that the line voltage of the inverter in the allowable range, after which the inverter is normal.

ABB frequency converter common faults: no show, lack of phase, over current, over voltage, under voltage, overheating, overload, grounding, parameter errors, there is no output, the module is damaged, reported the fault code, etc.. Maintenance ABB converter ASC510, ASC550, ASC800

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