Nexen TC920V 964356 - Manual (Page 27)

24 FORM NO. L21268-C-1013
7. ADVANCED SETTINGS
The TC920V features additional tuning parameters and operation modes that may be useful for attaining better tension
control depending on the machine configuration.
7.1 SENSITIVITY ADJUSTMENT
If the tension control response is poor or unstable, fine tuning adjustments can be made to improve sensitivity. The follow-
ing parameters can be changed for basic sensitivity adjustments in standard operation.
• No. 10 Control Filter A low pass filter is applied to the tension measurement to remove the fine motion
(high frequency) measurement of the tension signal. If tension variations with a
higher frequency become an issue, increase the filter. When this parameter is set to
high, the system will be slower to respond to fine motion (high frequency) tension
variations.
• No. 11 Proportional Gain Increasing P Gain increases tension responsiveness but decreases stability. If the
tension is slow to reach the set point, increase the P Gain. Setting the gain too
high will result in unstable tension or tension oscillations, in this case decrease the
P Gain.
• No. 12 Integral Time Integral Time adjusts the balance between tension responsiveness and stability. If
a balance can not be found by adjusting the Proportional Gain, adjust the Integral
Time. Decreasing the Integral Time increases responsiveness to tension variations,
but will result in tension overshoot if the value is set too low and the stability in the
steady state will be decreased. When the Integral Time is set too high, the tension
will be slower to respond to transients but the tension overshoot is reduced and
stability in the steady state is improved. Normally, set the integral time higher to
obtain high stability and increase the proportional gain accordingly to increase
responsiveness.
• No. 13 Differential Time Normally, the differential time is not used. The Differential Time will increase
responsiveness to large tension transients but can cause instability. If necessary,
set to approximately ¼ of the integral time as the standard. (To disable, set to
factory default 0.0)
NOTE
For advanced users only.
Best recommendation is to use the default value and only change if absolutely necessary.