Danfoss VLT Decentral Drive FCD 302 Design Manual page 22

Product Overview
Case 1: Positive Reference with Dead band, Digital input to
trigger reverse
General Reference
parameters:
Reference Range: Min - Max
Minimum Reference: 0 RPM (0,0%)
Maximum Reference: 500 RPM (100,0%)
Analog input 53
Low reference 0 RPM
High reference 500 RPM
Low voltage 1V
Ext. Reference
High voltage 10V
Absolute
0 RPM 1V
Ext. source 1
500 RPM 10V
Range:
0,0% (0 RPM)
100,0% (500 RPM)
RPM
500
Digital input 19
Digital input Low No reversing
High Reversing
Illustration 2.17 Example 1 - Positive Reference
®
VLT Decentral Drive FCD 302
Limited to: -200%- +200%
(-1000 RPM- +1000 RPM)
Ext. reference
+
Range:
0,0% (0 RPM)
100,0% (500 RPM)
Reference is scaled
according to min
max reference giving a
speed.!!!
V
10
1
Limits Speed Setpoint
according to min max speed.!!!
®
MG04H102 - VLT is a registered Danfoss trademark
This case shows how reference input with limits inside Min
to Max limits clamps.
General Motor
parameters:
Motor speed direction:Both directions
Motor speed Low limit: 0 RPM
Motor speed high limit: 200 RPM
Reference
algorithm
(0 RPM- +500 RPM)
Reference
Range:
0,0% (0 RPM)
100,0% (500 RPM)
Scale to
500
speed
Speed
setpoint
Range:
-500
-500 RPM
+500 RPM
Motor PID
Range:
Motor
-200 RPM
control
+200 RPM
Limited to:
0%- +100%
Dead band
RPM
V
10
1
Motor
21
2 2