Auto Tune Error Codes
Bias Adjustment
Clicking the Output button sets the D/A value sent to the internal I/P in SVI. This is useful for setting the
Bias adjustment of the SVI. When the button is clicked, a light will appear indicating that position control
loop is open and the output to the I/P has been set. Clicking the button a second time will close position
control loop and place the valve under control in manual mode.
The open-loop method for adjusting the bias is:
1.
Enter the proper bias value for SVI. The most common value is 2750.
2.
Click the Output button (the light should go on).
3.
Turn the adjustment screw on top of the SVI pneumatics block until the valve is positioned
approximately at mid range and the valve remains nearly motionless.
4.
Click the Output button again, the light should go off and the valve returns to its position
prior to this procedure.
57
Auto Tune
Error Code
Message
Action
0
Self-tuning is successful
Check the step response
33
Fail in open loop test
Check if an air booster or quick
exhaust is Used; Check the supply pressure
44
Fail to find a Bias.
Check if an air booster is used
Self-tuning is canceled
Place the valve at 50% and restart tune
55
The found Bias is not in the
Adjust the Bias
required range, and self-tuning
is canceled
66
Self-tuning for air fill direction fails
Check supply pressure; Check the linkage;
Check the grounding; Check the pneumatic
block especially spool S/A
77
Self-tuning for air exhausting
Check the pneumatic block
direction fails
especially spool S/A
