50 Program featuresThe following examples describes the first, second and third stage of acceleration inquick ramp mode.• First stage of acceleration (a) is to lift the impeller so that the fluid protects thebearings and sealings. Otherwise, the pump can get damaged. For example, 0 Hzto 25/30 Hz with ramp time of 1 second.• Second stage of acceleration (b) is an optional. The pump produces a valid flow inthis region, so the reasonable acceleration rate is requested to limit the turbidity.The effective inside region is 25/30 to 43/45 Hz and the ramp times typically arebetween 10 to 45 seconds.• Third stage of acceleration (c) is a normal ramp. The pump provides a reasonableflow rate. The drive uses normal ramp times, for example, 60 seconds.Settings• Menu - Primary settings - Ramps• Speed reference ramping: Parameters 23.12…23.13 and 46.01(pages 162 and 236).• Frequency reference ramping: Parameters 28.72…28.73 and 46.02(pages 173 and 236).• Motor potentiometer: Parameter 22.75 (page 161).• Emergency stop (“Off3” mode): Parameter 23.23 Emergency stop time(page 163).• Pump protections - Quick ramps: Parameter group 82 Pump protections (page274). Constant speeds/frequenciesConstant speeds and frequencies are predefined references that can be quicklyactivated, for example, through digital inputs. It is possible to define up to 7 speedsfor speed control and 7 constant frequencies for frequency control.WARNING: Speeds and frequencies override the normal referenceirrespective of where the reference is coming from.Settings• Parameter groups 22 Speed reference selection (page 154) and 28 Frequencyreference chain (page 167).
