Motor Power Company DUET_FL 48/10, User Manual

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Page 97
Here you can enter a "conversion factor" between the input voltage and the torque setpoint or the
speed setpoint .
In the Offset field, you can enter a voltage that will be automatically added to the voltage measured at
the analog input. This can be used, for instance, to compensate for the offset of the analog control
voltage of a control system and for the offset of the analog input in the controller. This solves the
problem that a very small setpoint is generated when a voltage of 0 V is assigned externally.
Another area of application is the possibility to assign positive and negative setpoints at an input
voltage of 0..10 V.
The "Safe zero" function limits the setpoint to zero if it lies within the voltage range defined in this field.
This makes sure that in the case of a setpoint of 0 V the drives remains at precisely at standstill for a
long time without drifting away slowly.
voltage
setpoint
safe
zero
Figure 27: Safe zero
Do not activate the "safe zero" function in the case of applications with a position control
(internally or through the external control), as from a control point of view it acts like a
dead range or a "backlash" in the control system - see Figure 27. During operation, this
downgrades the stability in the control circuit.
This menu has separate tabs for the two analog inputs so that you can scale them independently from
each other.
User Manual DUET_FL „DUET_FL 48/10“ Version 1.1 Motor Power Company