Danfoss VLT AutomationDrive FC 301 Design Manual page 36

Basic Operating Principles
Illustration 3.22 shows how reference input with limits outside -Max to +Max limits clamps to the inputs low and high limits
before being added to actual reference. Illustration 3.22 also shows how the actual reference is clamped to -Max to +Max by
the reference algorithm.
3 3
Ext. Reference
Absolute
0 RPM 1 V
750 RPM 10 V
Digital input
Illustration 3.22 Positive Reference with Dead Band, Digital Input to Trigger Reverse. Clamping Rules
34
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
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 1 V
High voltage 10 V
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
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
Ext. reference Range: Reference
algorithm
0,0% (0 RPM)
150,0% (750 RPM)
Reference
Range:
Reference is scaled
0,0% (0 RPM)
according to max
100,0% (500 RPM)
reference giving a speed
Scale to
speed
Speed
setpoint
Range:
-500 RPM
+500 RPM
Motor PID
Motor
control
MG33BF02 - Rev. 2013-12-20
Limited to:
-100%- +100%
(-500 RPM- +500 RPM)
Dead band
500
V
10
1
-500
Range:
Motor
-200 RPM
+200 RPM