Variable speed drives from Sundrive (29/04/2008)... PID control. The FVR-C11S has been primarily designed for fans, blowers, machine tools, conveyors, agitators, mixers, air curtains, window shades, jet baths, dish washers, dumbwaiters and pumps. The FVR-C11S comes in a range of 0.1 kilowatt to 2.2 ...