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Why the second output of the module TMC4AQ2 is not working in current mode?

Products TMC4AQ2 with date code lower than 1528 and larger than 1423 have a calibration issue only in current mode of the second output.
Anyway you can use the second output in voltage mode and the first output in current or voltage mode. 

If you need to configure the 2 outputs in current mode please contact your near Schneider Electric vendor.
You can find the date code in serial number that is located at the left side of the cartridge module:   

For example:

SN: 8B 1508 0028637T    ; 3th to 6th digit corresponds to the date code: 1508
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