Adjustable Speed Drives with a micro dial feature available from Zero-Max provide accurate, repeatable speed settings. This allows users to set and re-set various speeds to meet performance levels for different applications.

In a seeder cart application, for example, different settings can be made more accurately for dispensing seed (corn, wheat, oats, etc.). In textile applications, the Adjustable Speed Drive can be set with the micro dial for precise speed control in textile winding machines.

"Zero-Max Adjustable Speed Drives are a time-proven device for changing operating speeds in a system," says Bob Mainz, Zero-Max sales manager. "They're great for varying speed and flow rates in Peristaltic pumps. There are dozens of proven applications in many industries. They are extremely versatile and eliminate the need for expensive AC/DC drives or variable pitch belt drives. The new micro dial feature gives the system designer another great option for using these drives."

The drives accept input speeds from 0 to 2,000 rpm, and output speed changes are quick, whether the machine is running or not. Output speed is infinitely adjustable from 0 to 400 rpm with a 1,800 rpm input speed. The drives provide speed control for inputs from .25 to 1.5 hp applications, with output torque ratings from 12 through 200 inch-pounds.

The Zero-Max Adjustable Speed Drives can be used as a prime mover connected to a motor, or as a secondary drive connected to a shaft in the machine's driveline. When used as a prime mover, the drive acts as a variable speed device. When used as a secondary drive, it becomes a variable ratio device. The drive allows slow or fast, small or large speed changes.

Output speed for the drive is set quickly with the hand wheel adjustment. The Micro Dial provides a clean reference for applications that require repeatability.

The drives are simple to mount from most positions, can handle any input (including chain, belt and couplings) and they are simple to install without wires. They come factory lubricated, and they are compact and economical. A full range of sizes and models are available, including custom designs.