Program features 53
Settings and diagnostics
• Speed reference ramping - Parameters 23.11…23.15, 23.32 Shape time 1, 23.33
Shape time 2 and 46.01 Speed scaling.
• Torque reference ramping - Parameters 01.30 Nominal torque scale, 26.18
Torque ramp up time and 26.19 Torque ramp down time.
• Frequency reference ramping - Parameters 28.71…28.75 and 46.02 Frequency
scaling.
• Jogging - Parameters 23.20 Acc time jogging and 23.21 Dec time jogging.
• Motor potentiometer - Parameter 22.75 Motor potentiometer ramp time.
• Emergency stop (“Off3” mode) - Parameter 23.23 Emergency stop time.
Events: -
Constant speeds/frequencies
Constant speeds and frequencies are predefined references that can be quickly
activated, for example, through digital inputs. It is possible to define up to 7 speeds
for speed control and 7 constant frequencies for frequency control.
WARNING! Speeds and frequencies override the normal reference
irrespective of where the reference is coming from.
Settings and diagnostics
Parameter groups 22 Speed reference selection and 28 Frequency reference chain.
Events: -
Critical speeds/frequencies
Critical speeds (sometimes called “skip speeds”) can be predefined for applications
where it is necessary to avoid certain motor speeds or speed ranges because of, for
example, mechanical resonance problems.
The critical speeds function prevents the reference from dwelling within a critical band
for extended times. When a changing reference enters a critical range, the output of
the function freezes until the reference exits the range. Any instant change in the
output 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 the
absolutely lowest critical speed (critical speed low or critical frequency low) when
accelerating from standstill, unless the speed reference is over the upper critical
speed/ frequency limit.
ACS180 FW.book Page 53 Tuesday, March 9, 2021 2:25 PM
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