SINAMICS S120 Functi.. - Gregbotos.com

Extended Setpoint ChannelExtended setpoint channel2.2.8 Ramp-function generatorDescriptionThe ramp-function generator is used to limit acceleration in the event of abrupt setpointchanges, which helps prevent load surges throughout the drive train. Theramp-up time p1120[D] and ramp-down time p1121[D] can be used to set an accelerationramp and a deceleration ramp independently of each other. This allows acontrolled transition to be made in the event of setpoint changes.The maximum speed p1082[D] is used as a reference value for calculating theramps from the ramp-up and ramp-down times. A special adjustable ramp can beset via p1135 for fast stop (OFF3), e.g. for rapid controlled deceleration when anemergency stop button is pressed.There are two types of ramp-function generator:Simple ramp-function generator with– Acceleration and deceleration ramps– Ramp for fast stop (OFF3)– Tracking can be selected via a binector input– Setting values for the ramp-function generatorExtended ramp-function generator with– Initial and final rounding offNoteThe ramp-function generator cannot be frozen (via p1141) in jog mode(r0046.31 = 1).© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition2-59