Program features 63ParametersParameters:• Speed reference ramping 23.11…23.15, 23.32, 23.33 and 46.01.• Torque reference ramping 01.30, 26.18 and 26.19.• Frequency reference ramping 28.71…28.75 and 46.02.• Jogging 23.20 and 23.21.• Motor potentiometer 22.75.• Emergency stop (“Off3” mode) 23.23 Emergency stop time. 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.Parameters and diagnosticsGroups 22 Speed reference selection and 28 Frequency reference chain. Critical speeds/frequenciesCritical speeds (sometimes called “skip speeds”) can be predefined for applicationswhere it is necessary to avoid certain motor speeds or speed ranges because of, forexample, mechanical resonance problems.The critical speeds function prevents the reference from dwelling within a critical bandfor extended times. When a changing reference enters a critical range, the output ofthe function freezes until the reference exits the range. Any instant change in theoutput is smoothed out by the ramping function further in the reference chain.When the drive is limiting the allowed output speeds/frequencies, it limits to theabsolutely lowest critical speed (critical speed low or critical frequency low) whenaccelerating from standstill, unless the speed reference is over the upper criticalspeed/ frequency limit.
