[DB600] General instruction manual
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6-7 Actuator adjustment for ON-OFF servo output type
When the ON-OFF servo output type is used, the instrument and the actuator (motor, etc.) need to be
adjusted. Generally the adjustment is performed automatically. Fine adjustment can be done manually;
however, if you are using the instrument for the first time, make sure to perform auto adjustment first and
then perform fine adjustment manually. Without performing the auto adjustment, an error occurs between
the output value on the output display screen and feedback value.
6-7-1
Auto adjustment
(1) Initialization of setting value
Before starting the adjustment, change the setting of "Feedback dead band (MODE6)" to default
(4.0%).
Check that the parameters are set to ensure the output range of 0 to 100%. Tuning is performed
within the setting range of output limiter. If the setting range of output limiter is small (less than
approx. 60%), the auto adjustment may not be performed.
(2) Zero/span adjustment
Select FB tuning start at "FB tuning (operation screen)". At this time, the feedback adjustment data
displayed on the output display screen is initialized.
The actuator automatically moves to the OPEN (output display "O2" lights) and CLOSE (output
display "O1" lights) sides to calculate the zero/span value.
When the tuning is completed, check the tuning result at "Feedback zero/span (MODE6)" and
perform fine adjustment with "Feedback dead band (MODE6)"if necessary.
The automatically calculated zero/span value will be stored in "Feedback zero/span (MODE6)"
automatically.
(3) Deadband adjustment (gain adjustment)
See the manual adjustment (5) in the next section.
Tuning may be forced to end if an output related connection error occurs or tuning
takes too long. Also, if the input is inappropriate, PV abnormal output may be given
priority, preventing the tuning from starting normally.
If the actuator moves too slowly, the automatic calculation with the FB tuning setting
cannot be performed. In this case, the system returns to "END" after a certain
period of time and the zero/span value will not be registered.
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