VALMET A413285 BIR82 Logic module

PI w/Lead-Lag—The PI w/Lead/Lag controller is a PI controller with a lead/lag block conditioning the demand signal. Note that the lead time constant is not entered directly, but is determined by the Lead Lag Ratio. Tuning this control is the same as the PI control. The lead/lag term may he used to set the actuator response to some ideal value. The lead/lag may he used for increasing or decreasing the apparent bandwidth of the actuator thereby tailoring performance for the application. Of course, the control cannot force the actuator to exceed its physical limits, e.g., slew rate and dead time.

Configuring and Adjusting a Proportional Control

Proportional—The proportional actuator controller uses a “command trim” scheme to reduce steady-state position errors in proportional actuators. Minimum Position Current The actuator current which corresponds to 0 % position demand. Allowed Range: –250 mA to +250 mA Maximum Position Current The actuator current which corresponds to 100 % position demand. Allowed Range: –250 mA to +250 mA Lag Time Constant The approximate actuator lag time.

Command Trim Enable check-box 

When checked, an integrator trims the error between the position demand and the position feedback to zero, When not checked, position feedback is ignored and the current to the actuator is directly proportional to the demand input. Gain Adjustments are made from DeviceNet check-box When checked, the Controller Integral Gain is updated over the DeviceNet bus and cannot he modified by the service tool. When not checked, the Controller Integral Gain may be modified by the service tool. Controller Integral Gain Integrator gain for the command trim function.

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