... motor driver, 100% controllable speed by 0-10V/PWM signa, alarm reply, etc. avaialbe in 12V to 56V DC input. DC ... -voltage protection,fan speed controls, fan good/bad alarm,temperature/pressure/CO2 sensor alarm and custom fan trays. our driver and controller ... .init( { 'aImgSrc': aBigImageSrc } ); } )(); PWM variable speed Brushless DC motor driver with alarm reply