Danfoss VLT Micro Drive FC 51 Programming Manual page 23

Parameter Descriptions
VLT
3-12 Catch Up/Slow Down Value
Range: Function:
0% * [0-100%] The Catch-up/Slowdown function is activated by
an input command (see 5-1* Digital Inputs,
choice [28]/[29]). If the command is active, the
Catch-up/Slowdown value (in %) is added to
the reference function as follows:
Reference = Reference + Reference
4 4
Catchup Slowdown
×
100
Reference = Reference − Reference
Catchup Slowdown
×
100
When the input command is inactivated, the
reference returns to its original value ie.
Reference=Reference + 0.
3-14 Preset Relative Reference
Range: Function:
0.00% [-100.00-100.00%] Define fixed value in % to be added
to variable value defined in 3-18
Relative Scaling Reference Source.
The sum of fixed and variable values
(labeled Y in illustration below) is
multiplied with actual reference
(labeled X in illustration). This
product is added to actual reference
Y
X + X ×
100
Y
Relative Z
X Z=X+X*Y/100
Illustration 4.5
3-15 Reference 1 Source
Option: Function:
3-15 Reference 1 Source, 3-16 Reference 2
Source and 3-17 Reference 3 Source define
up to three different reference signals.
The sum of these reference signals defines
the actual reference.
[0] No Function No reference signal is defined.
[1] Analog Input Use signals from analog input 53 as
*
53 reference, see parameter group 6-1*
Analog Input 1.
[2] Analog Input Use signals from analog input 60 as
60 reference, see parameter group 6-2*
Analog Input 2.
[8] Pulse input 33 Use signals from pulse input as reference,
see parameter group 5-5* Pulse Input.
[11] Local Bus Use signals from local bus as reference,
Reference see parameter group 8-9* Bus Feedback.
[21] LCP Potenti- Use signals from LCP potentiometer as
ometer reference, parameter group 6-8* LCP
Potentiometer.
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Micro Drive FC 51 Programming Guide
3-16 Reference 2 Source
Option: Function:
See 3-15 Reference 1 Source for
description.
[0] No Function No reference signal is defined.
[1] Analog Input 53 Use signals from analog input 53 as
reference.
[2] Analog Input 60 Use signals from analog input 60 as
*
reference.
[8] Pulse input 33 Use signals from pulse input as
reference, see parameter group 5-5*
Pulse Input.
[11] Local Bus Use signals from local bus as
Reference reference.
[21] LCP Potentiometer Use signals from LCP potentiometer as
reference.
3-17 Reference 3 Source
Option: Function:
See 3-15 Reference 2 Source for
description.
[0] No Function No reference signal is defined.
[1] Analog Input 53 Use signals from analog input 53 as
reference.
[2] Analog Input 60 Use signals from analog input 60 as
reference.
[8] Pulse input 33 Use signals from pulse input as
reference, see parameter group 5-5*
Resulting Pulse Input.
actual
reference
[11] * Local Bus Use signals from local bus as
Reference reference.
[21] LCP Potentiometer Use signals from LCP potentiometer
as reference.
3-18 Relative Scaling Reference Source
Option: Function:
Select the source for a variable value to
be added to the fixed value defined in
3-14 Preset Relative Reference.
[0] No Function The function is disabled
*
[1] Analog Input 53 Select analog input 53 as relative
scaling reference source.
[2] Analog Input 60 Select analog input 60 as relative
scaling reference source.
[8] Pulse Input 33 Select pulse input 33 as relative scaling
reference source.
[11] Local Bus Select local bus ref. as relative scaling
Reference reference source.
[21] LCP Potentiometer Select LCP potentiometer as relative
scaling reference source.
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