ABB ACS580 - Page 237

Parameters 233
28.51 Critical frequency
function
Enables/disables the critical frequencies function. Also
determines whether the specified ranges are effective in both
rotating directions or not.
See also section Critical speeds/frequencies (page 97).
0000b
0000b…0011b Critical frequencies configuration word. 1 = 1
28.52 Critical frequency 1
low
Defines the low limit for critical frequency 1.
Note: This value must be less than or equal to the value of
28.53 Critical frequency 1 high.
0.00 Hz
-500.00…500.00
Hz
Low limit for critical frequency 1. See par.
46.02
28.53 Critical frequency 1
high
Defines the high limit for critical frequency 1.
Note: This value must be greater than or equal to the value of
28.52 Critical frequency 1 low.
0.00 Hz
-500.00…500.00
Hz
High limit for critical frequency 1. See par.
46.02
28.54 Critical frequency 2
low
Defines the low limit for critical frequency 2.
Note: This value must be less than or equal to the value of
28.55 Critical frequency 2 high.
0.00 Hz
-500.00…500.00
Hz
Low limit for critical frequency 2. See par.
46.02
28.55 Critical frequency 2
high
Defines the high limit for critical frequency 2.
Note: This value must be greater than or equal to the value of
28.54 Critical frequency 2 low.
0.00 Hz
-500.00…500.00
Hz
High limit for critical frequency 2. See par.
46.02
28.56 Critical frequency 3
low
Defines the low limit for critical frequency 3.
Note: This value must be less than or equal to the value of
28.57 Critical frequency 3 high.
0.00 Hz
-500.00…500.00
Hz
Low limit for critical frequency 3. See par.
46.02
28.57 Critical frequency 3
high
Defines the high limit for critical frequency 3.
Note: This value must be greater than or equal to the value of
28.56 Critical frequency 3 low.
0.00 Hz
-500.00…500.00
Hz
High limit for critical frequency 3. See par.
46.02
28.71 Freq ramp set
selection
Selects a source that switches between the two sets of
acceleration/deceleration times defined by parameters
28.72
….
0 = Acceleration time 1 and deceleration time 1 are in force
1 = Acceleration time 2 and deceleration time 2 are in force
DI5
Acc/Dec time 1 0. 0
No. Name/Value Description Def/FbEq16
Bit Name Information
0 Crit freq 1 = Enable: Critical frequencies enabled.
0 = Disable: Critical frequencies disabled.
1 Sign mode 1 = According to par: The signs of parameters 28.52…28.57 are taken
into account.
0 = Absolute: Parameters 28.52…28.57 are handled as absolute values.
Each range is effective in both directions of rotation.
ACS580 FW.book Page 233 Wednesday, September 21, 2016 9:48 PM