The ornamental design for a contactsignalconverter, as shown and described.
FIG. 1 is a front perspective view of a contact signal converter showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof in use.
The broken lines shown are included for the purpose of illustrating the unclaimed portions of the contact signal converter and form no part of the claimed design.