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Download Operating instructions ACU
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14.7 Frequency ramps The ramps determine how quickly the frequency value is changed if the reference value changes or after a start, stop or brake command. The maximum admissible ramp gradient can be selected according to the application and the current consumption of the motor. If the settings of the frequency ramps are identical for both directions of rotation, the parameterization via the parameters Acceleration (clockwise) 420 and Deceleration (clockwise) 421 is sufficient. The values of the frequency ramps are taken over for Acceleration anticlockwise 422 and Deceleration anticlockwise 423 if these have been parameterized to the factory setting of -0.01 Hz/s. The parameter value of 0.00 Hz/s for the acceleration blocks the corresponding direction of rotation. No. 420 421 422 423 1) 2) Parameter Description Acceleration (clockwise) Deceleration (clockwise) Acceleration anticlockwise Deceleration anticlockwise Min. 0.00 Hz/s 0.01 Hz/s - 0.01 Hz/s 1) - 0.01 Hz/s 2) Settings Max. 9999.99 Hz/s 9999.99 Hz/s 9999.99 Hz/s 9999.99 Hz/s Fact. sett. 5.00 Hz/s 5.00 Hz/s - 0.01 Hz/s - 0.01 Hz/s Value -0.01 Hz/s means: Acceleration (Clockwise) 420 is applied. Value -0.01 Hz/s means: Deceleration (Clockwise) 421 is applied. The setting 0.00 Hz/s won’t accelerate or decelerate the drive due to the limitation of the ramp. The ramps for the Emergency stop clockwise 424 and Emergency stop anticlockwise 425 of the drive mechanism to be activated via Operation mode 630 for the stopping behavior must be selected according to the application. The non-linear (Sshaped) course of the ramps is not active in the case of an emergency stop of the drive. Parameter No. Description 424 Emergency stop clockwise 425 Emergency stop anti-clockwise Settings Max. 9999.99 Hz/s 9999.99 Hz/s Min. 0.01 Hz/s 0.01 Hz/s Fact. sett. 5.00 Hz/s 5.00 Hz/s +f m ax Rotary field clockwise Acceleration (Clockwise) 420 Deceleration (Clockwise) 421 or Emergency Stop C lockwise 424 t Rotary field anticlockwise Acceleration (anticlockwise) 422 Deceleration anticlockwise 423 or Emergency Stop anticlockwise 425 -f ma x 06/13 Operating Instructions ACU 163
