Program features 97
Settings
•
Menu - Primary settings - Ramps
• Speed reference ramping: Parameters
(pages
and
).
• Torque reference ramping: Parameters
and
(pages
and
).
• Frequency reference ramping: Parameters
(pages
and
).
• Jogging: Parameters
and
(page
).
• Motor potentiometer: Parameter
(page
).
• Emergency stop (“Off3” mode): Parameter
(page
).
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
•
Menu - Primary settings - Start, stop, reference - Constant frequencies,
Menu - Primary settings - Start, stop, reference - Constant speeds
• Parameter groups
(page
(page
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.
ACS580 FW.book Page 97 Wednesday, September 21, 2016 9:48 PM
