why is the actuator not working!?

Hello All,

I have setup the stage for the Firgelli actuator L12 -I,
using an Arduino Mega + Adafruit Motor Shield (please take a look at pictures).
I tested the circuit with a motor and the Adafruit "DC Motor" example code: it works.
I then replaced the motor with the actuator using the same code: it does not work!!
I would very much appreciate your help.

Regards,
Behzad.

See datasheet, Option I
http://firgelli.com/Uploads/L12_datasheet.pdf
Looks like you should use the servo.lib to control it?