188 Parameters
28.17 Ext2 frequency
function
Selects a mathematical function between the reference
sources selected by parameters 28.15 Ext2 frequency
ref1 and 28.16 Ext2 frequency ref2. See diagram at 28.15
Ext2 frequency ref1.
Ref1
Ref1 Signal selected by 28.15 Ext2 frequency ref1 is used as
frequency reference 1 as such (no function applied).
0
Add (ref1 + ref2) The sum of the reference sources is used as frequency
reference 1.
1
Sub (ref1 - ref2) The subtraction ([28.15 Ext2 frequency ref1] - [28.16 Ext2
frequency ref2]) of the reference sources is used as
frequency reference 1.
2
Mul (ref1 × ref2) The multiplication of the reference sources is used as
frequency reference 1.
3
Min (ref1, ref2) The smaller of the reference sources is used as frequency
reference 1.
4
Max (ref1, ref2) The greater of the reference sources is used as frequency
reference 1.
5
28.21 Constant frequency
function
Determines how constant frequencies are selected, and
whether the rotation direction signal is considered or not
when applying a constant frequency.
0001b
0000b…0001b Constant frequency configuration word. 1 = 1
No. Name/Value Description Default
FbEq 16
Bit Name Information
0 Const freq
mode
1 = Packed: 7 constant frequencies are selectable using the three
sources defined by parameters 28.22, 28.23 and 28.24.
0 = Separate: Constant frequencies 1, 2 and 3 are separately activated
by the sources defined by parameters 28.22, 28.23 and 28.24
respectively. In case of conflict, the constant frequency with the smaller
number takes priority.
1Direction
enable
1 = Start dir: To determine running direction for a constant frequency, the
sign of the constant frequency setting (parameters 28.26…28.32) is
multiplied by the direction signal (forward: +1, reverse: -1). This
effectively allows the drive to have 14 (7 forward, 7 reverse) constant
frequencies if all values in 28.26…28.32 are positive.
WARNING: If the direction signal is reverse and the active
constant frequency is negative, the drive will run in the forward
direction.
0 = According to Par: The running direction for the constant frequency is
determined by the sign of the constant speed setting (parameters
28.26…28.32).
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