Danfoss VLT 380-500 V Design Manual page 143

Handling of References
Case 2. This case shows how reference input with limits outside -maximum to +maximum limits clamps to the inputs low
and high limits before addition to external reference, as well as how the external reference is clamped to -maximum to
+maximum by the reference algorithm.
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
Ext. Reference
High voltage 10 V
Absolute
0 RPM 1 V
Ext. source 1
750 RPM 10 V
Range:
0,0% (0 RPM)
150,0% (750 RPM)
750
1
Digital input 19
Low No reversing
Digital input
High Reversing
Illustration 15.10 Positive Reference with Dead Band, Digital Input to Trigger Reverse. Clamping Rules
MG37N102
Design Guide
Limited to: -200%- +200%
(-1000 RPM- +1000 RPM)
Ext. reference Range:
+
0,0% (0 RPM)
150,0% (750 RPM)
Reference is scaled
according to max
reference giving a speed
V
10
Limits Speed Setpoint
according to min max speed
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General Motor
parameters:
Motor speed direction: Both directions
Motor speed Low limit: 0 RPM
Motor speed high limit: 200 RPM
Reference
Limited to:
algorithm
-100%- +100%
(-500 RPM- +500 RPM)
Reference
Range:
0,0% (0 RPM)
100,0% (500 RPM)
Dead band
Scale to
500
speed
1
Speed
setpoint
Range:
-500
-500 RPM
+500 RPM
Motor PID
Range:
Motor
-200 RPM
control
+200 RPM
V
10
Motor
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