Constant Speeds/Frequencies; Critical Speeds/Frequencies - ABB +N5600 Firmware Instructions

80 Program features
Special acceleration/deceleration ramps
The acceleration/deceleration times for the jogging function can be defined
separately; see section
The change rate of the motor potentiometer function (page 106) is adjustable. The
same rate applies in both directions.
A deceleration ramp can be defined for emergency stop ("Off3" mode).
Settings
• Speed reference ramping: Parameters
(pages 257 and 364).
• Torque reference ramping: Parameters 01.30,
(pages 154 and 282).
• Frequency reference ramping: Parameters
(pages 291 and 364).
• Jogging: Parameters
• Motor potentiometer: Parameter
• Emergency stop ("Off3" mode): Parameter
(page 260).


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 constant
speeds for speed control and 7 constant frequencies for frequency control.
WARNING: Constant speeds and frequencies override the normal reference
irrespective of where the reference is coming from.
The constant speeds/frequencies function operates on a 2 ms time level.
Settings
Parameter groups
reference chain (page 285).


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
a critical range, the output of the function
Jogging (page 92).
23.20 and 23.21
22.75
22 Speed reference selection
23.11...23.19 and
26.18 and
28.71...28.75
(page 260).
(page 255).
23.23 Emergency stop time
(page 249) and
(22.87 Speed reference act
(22.01 Speed ref unlimited) freezes until the
46.01
26.19
and 46.02
28 Frequency
7) enters