Danfoss VLT AutomationDrive Design Manual page 29

Introduction to FC 300
Case 2: Positive Reference with Dead band, Digital input to trigger reverse. Clamping rules.
This Case shows how Reference input with limits outside -Max – +Max limits clamps to the inputs low and high limits
before addition to External reference. And how the External reference is clamped to -Max – +Max by the Reference
algorithm.
3 3
Ext. Reference
Absolute
0 RPM 1V
750 RPM 10V
Digital input
28
FC 300 Design Guide
General Reference
parameters:
Reference Range: -Max - Max
Minimum Reference: Don't care
Maximum Reference: 500 RPM (100,0%)
Analog input 53
Low reference 0 RPM
+
High reference 500 RPM
Low voltage 1V
High voltage 10V
Ext. source 1
Range:
0,0% (0 RPM)
150,0% (750 RPM)
750
V
10
1
Digital input 19
Low No reversing
High Reversing
Limits Speed Setpoint
according to min max speed.!!!
MG.33.BD.02 - VLT
General Motor
parameters:
Limited to: -200%- +200%
Motor speed direction:Both directions
(-1000 RPM- +1000 RPM)
Motor speed Low limit: 0 RPM
Motor speed high limit: 200 RPM
Reference
Ext. reference
algorithm
Range:
0,0% (0 RPM)
150,0% (750 RPM)
Reference
Range:
Reference is scaled
0,0% (0 RPM)
according to
100,0% (500 RPM)
max reference giving a
speed.!!!
Scale to
speed
Speed
setpoint
Range:
-500 RPM
+500 RPM
Motor PID
Motor
control
®
is a registered Danfoss trademark
Limited to:
-100%- +100%
(-500 RPM- +500 RPM)
Dead band
500
V
10
1
-500
Range:
Motor
-200 RPM
+200 RPM