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Reforming the capacitors 9

Reforming the capacitors

This chapter contains the instructions on how to reform the converter capacitors. It

contains three alternative methods.

Electrolytic DC capacitors in the converter module DC link need to be reformed (re-aged) if

the module has been non-operational for a year or more. The reforming time depends on

how long the converter has been non-operational and on the converter module type.

Without reforming, the capacitors can get damaged when the converter starts to operate.

If the converter has been non-operational for less than one year, the capacitors do not

need reforming.

Besides the reforming methods presented in this manual, ABB can supply you with ready-

made reforming devices, such as FINERO FST-DCP 1500-05 and FUG HCK 800-2000.

For more information, contact your local ABB representative.

The intermediate circuit (DC link) of the converter is connected to its nominal voltage for

the reforming time to "wake up" the capacitors. The diagram below shows the required

reforming time.

If the converter has been stocked (non-operational) for one to two years (graph a), it can

be reformed with power on for 30 minutes method.

If the converter has been stocked (non-operational) for one to three years (graph b), it can

be reformed with power on for 30 minutes method. See section

Reforming with power on

for 30 minutes

on page 11.