Info from the alarm book - I have no idea what to tell you to do, but maybe knowing what the book says about the alarm will help. This is assuming its an 113 - A series alarm
113 - LDU Overload
The overload relay of LDU is tripped
Index - None
Character String - None
Code - 1
Probable Faulty Locations: Overload for axis drive unit (LOA/input signal is turned off ...EC input, No. 7 bit 1)
The EC input above is faulty.
Measures to Take - Check EC input No. 7 bit 1.