7 Speed mode and force/torque mode
186 Festo – GDCP-CMMS/D-FW-EN – 1404NH – English
Parameters: Scaling, offset and safe zero
The diagram shows the course of the rotational speed/speed characteristic curve as a function of the
analogue input, taking into acc ount the parameters “scaling/offset/safe zero”.
-1 17.5510-10 -7.5 -5 -2.5
1250
1000
500
-500
-750
-1000
[V]
Linear axis [mm/s]
Rotative axis [rpm]
750
2.5
1
1
3
2
1 Safe Zero = 1 V
2 Offset = -2.5 V
3 Scaling: 10 V = 1000 [mm/s][rpm]
Fig. 7.4 Rotational speed/speed characteristic c ur 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 rotational speed/speed characteristic curve is thus
asymmetric.
Example: Asymmetry at offset = -2.5 V Fig. 7.4:
– Linear axis: -10 V = -750 mm/s, + 10 V = 1250 mm/s.
– Rotative axis: -10 V = -750 rpm, + 10 V = 1250 rpm.
Safe Zero:
If the parameter “Safe Zero” is used, the c ontrol range of the rotational speed/speed
characteristic cur ve is reduced by the range “Safe Zero”.
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