Toshiba VF-AS1 instruction manual Adjusting the analog command voltage and current

E6581301

￿￿￿￿# Differential (D) gain

The differential (D) gain set with f366 is the differential (D) gain obtained by PID control.

The differential gain increases the speed of response to rapid changes in deviation. If this gain is set excessively high, a phenomenon in which the output frequency greatly fluctuates may occur.

Previous deviation-current deviation

Feedback value

High differential gain
Low differential gain	Time

If one of input terminals is assigned input terminal function 52/53 (PID differentiation/integration reset), differential and integral values are always 0 (zero) during the input terminal on.

5) Adjusting the analog command voltage and current

For items which can be adjusted by reference and feedback input, such as voltage/current input (VI/II input),voltage input (RR/S4 input) and voltage input (RX input), adjust scaling factor of the voltage/current if necessary.

When feedback signals are very low, the gain can be increased by this adjustment.

When VI/II used as a voltage input terminal (Default setting)

When VI/II used as a current input terminal (￿￿￿￿ needs to be set to 1)

6

!￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ￿￿￿￿￿

!(80Hz)! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! (80Hz)

!	￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !	￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
!	(0Hz)! ! 2V! ! ! ! ! ! ! ! ! ! ! 10V! ! ! ! !	(0Hz)! ! 4mA! ! ! ! ! ! ! ! ! ! ! 20mA

!! ! ! ! ￿￿￿￿! ! ! ! ! ! ! ! ! ￿￿￿￿￿! ! ! ! ! ! ! ! ! ￿￿￿￿! ! ! ! ! ! ! ! ! ! ￿￿￿￿

!! ! ! ! 20%! ! ! ! ! ! ! ! ! ! 100%! ! ! ! ! ! ! ! ! ! ! 20%! ! ! ! ! ! ! ! ! ! 100%

When RR/S4 used as a voltage input terminal	When RX used as a voltage input terminal
(Default setting)	(Default setting)

!￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ￿￿￿￿

!(80Hz)! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! (80Hz)

!￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ￿￿￿￿￿

! (0Hz)! 0V! ! ! ! ! ! ! ! ! ! ! ! 10V! ! ! ! (0Hz)! ! 0V! ! ! ! ! ! ! ! ! ! ! ! 10V

!! ! ! ￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ￿￿￿￿! ! ! ! ! ! ! ! ￿￿￿￿! ! ! ! ! ! ! ! ! ! ! ￿￿￿￿

!! ! ! 0%! ! ! ! ! ! ! ! ! ! ! ! 100%! ! ! ! ! ! ! ! ! 0%! ! ! ! ! ! ! ! ! ! ! ! 100%

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