7 Speed mode and force/torque mode
Festo – GDCP-CMMS/D-FW-EN – 1404NH – Engli sh 191
Parameters: Scaling, offset and safe zero
The diagram shows the course of the torque/forc e characteristic c urve as a function of the analogue
input, taking into account the parameters “scaling, offset and safe zero”.
-1 17.5510-10 -7.5 -5
-2.5
125
100
50
-50
-75
-100
[V]
[%]
75
2.5
1
1
3
2
1 Safe Zero = 1 V
2 Offset = -2.5 V
3 Scaling: 10 V = 100 % ( related to the motor
nominal current)
Fig. 7.8 Torque/forc e characteristic cur ve
Offset:
If the parameter “Offset” is used, the referenc e zero point is shifted by the value of the
offset to the offset zero point. The torque/force characteristic cur ve is thus asymmetric.
Example: Asymmetry at offset = -2.5 V Fig. 9.7:
– Linear/rotative axis: -10 V = -75 %, + 10 V = 125 % of the motor nominal current.
Safe Zero:
If the parameter “Safe Zero” is used, the control range of the torque/forc e characteristic
curve is reduced by the range “Safe Zero”.
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