Field over current issue

FIELD OVER CURRENT ISSUE

6RA70 95  4GV62,   600V 2000A

Field rating output - 375 v   40A

Equipment 1000 HP  Crane Hoist Motor.  field = 5.4 ohms,      rated field 38.5 amps 

ISSUE - field is going what looks like full on at 48 amps / Blowing 50 amp field fuses

replaced - field control card, field rectifier and SCR module, cud card, firing control card,

Par 102 set to 38.5 amps  no changes made to system for the last 10 Months

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Split from Field current problem..