VALMET A413295 AIR8C Logic module

Min Position Wind-Up Threshold Determines the region near the minimum stop where the integrator in the command trim function is turned off to avoid integrator wind-up. When the position demand moves below this value, the integrator is turned off. The integrator turns back on when the position demand exceeds 150 % of the threshold. When the Min Position Wind-Up Threshold is set to 0 % this function is disabled, and the integrator is always enabled regardless of the position demand value. Allowed Range: 0 % to 10 %

Max Position Wind-Up Threshold 

Determines the region near the maximum stop where the integrator in the command trim function is turned off to avoid integrator wind-up. When the position demand moves above this value, the integrator is turned off. The integrator turns back on when the position demand moves below (100 % demand—150 % of the threshold). When the Max Position Wind-Up Threshold is set to 100 % this function is disabled, and the integrator is always enabled regardless of the position demand value. Allowed Range: 90 % to 100 %

When command trim is not enabled

 position feedback is ignored and the current to the actuator is directly proportional to the demand input. When command trim is enabled, an integrator trims the error between the position demand and the position feedback to zero. The output of the integrator is limited to ± 10 % of the range defined by Minimum Position Current and Maximum Position Current. The command trim function is internally disabled if there is no valid feedback signal. When command trim is configured as disabled, position error faults are not generated.

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