Danfoss VLT Decentral Drive FCD 302 Design Manual page 24

Product Overview
Case 3: Negative to positive reference with dead band,
Sign determines the direction, -Max to +Max
General Reference
parameters:
Reference Range: -Max - +Max
Minimum Reference: Don't care
Maximum Reference: 1000 RPM (100,0%)
Analog input 53
Low reference 0 RPM
High reference +500 RPM
Low voltage 1V
Ext. Reference
High voltage 10V
Absolute
-500 RPM -10V
Ext. source 1
+500 RPM 10V
Range:
-50,0% (-500 RPM)
+50,0% (+500 RPM)
Analog input 54
Low reference -500 RPM
High reference +500 RPM
Low voltage -10V
Ext. Reference
High voltage +10V
Absolute
-500 RPM -10V
Ext. source 2
+500 RPM 10V
Range:
-50,0% (-500 RPM)
+50,0% (+500 RPM)
Illustration 2.19 Example 3 - Positive to Negative Reference
®
VLT Decentral Drive FCD 302
Dead band
-1V to 1V
Ext. reference
+
Range:
-100,0% (-1000 RPM)
+100,0% (+1000 RPM)
RPM
500
-1
-10
V
10
1
-500
RPM
500
V
-10 10
Limits Speed to min max
motor speed.!!!
-500
No Dead
band
®
MG04H102 - VLT is a registered Danfoss trademark
General Motor
parameters:
Motor speed direction:Both directions
Motor speed Low limit: 0 RPM
Motor speed high limit: 1500 RPM
Reference
algorithm
Reference
Limited to:
Range:
-200%- +200%
-100,0% (-1000 RPM)
(-2000 RPM-
+2000 RPM)
+100,0% (+1000 RPM)
Limited to:
-100%- +100%
Scale to
(-1000 RPM-
RPM
+1000 RPM)
Reference is scaled
Speed
according to max
setpoint
reference.!!!
Range:
-1000 RPM
+1000 RPM
Motor PID
Motor
control
Motor
23
2 2