I have never used a 1 HP servo. I have used little 1.5 inch long servos.
These have 3 wires. Two are red and black, and go to the power supply.
The third wire is the control line. It requires a pulse which varies between 1 and 2 milli-Seconds. The length of the pulse shall be in proportion to the position you want it to move to. Its movement is within a 190 degree arc.
50 per second is a typical frame rate for control pulses.
The above applies to small servos such as are used in radio controlled planes / boats / cars. Your servo motor may or may not operate the same way.