Lehner 22 series

[RC-Monster Mike]

The 120 and 150 amp controllers still have the 42000 rpm limit. For best results and reliability, select a motor that will not exceed this rpm with the voltage you intend to use. The controller will act up when pushed beyond this limit. Under a heavy load, bad things could happen. The low switching frequency is optimized for below 42000 rpms, so it is best to stay there. Make the speed with gearing and keep the rpms below the limit and the controllers will be smooth, cool running and reliable.