Our Galvanometer Optical Scanner Driver (GVD) have two options in control systems: P Contorl and PI Control Systems. Please read the following description of the systems and select one according to your application. P Control : This control will output the signal proportional to the error which is obtained by comparing position feedback and command signal. The scanner responds fast and stabilizes position quickly because servo closed loop band becomes high by not integrate the time. In case of distortion or friction, a position error may occur against the command. This control will output the time-integrated signal of the error which is obtained by comparing position feedback and command signal. Therefore, it is possible to maintain a stationary state (a state with extremely small position error) regardless of distortion or friction. This integration provides very high position repeatability. Please select P Control if considering for the high speed stabilization time, or PI Control for high position repeatability. *Peek current may have limit,depends on Galvo type and power supply voltage.