RELIANCE 57401 Pulse input module

Actuator Minimum Current Determines the most negative actuator current that can be output, and sets the scaling for the -100 % controller output point. Allowed Range: –250 mA to +250 mA Actuator Maximum Current Determines the most positive actuator current that can be output, and sets the scaling for the 100 % controller output point. Allowed Range: –250 mA to +250 mA Gain Adjustments are made from DeviceNet check-box When checked, the Controller Integral Gain is updated over the DeviceNet bus and cannot be modified by the service tool. When not checked, the Controller Integral Gain may be modified by the service tool.

The following procedure

 may be used as a starting point to finding the optimal dynamic settings: 1. Adjust Controller Integral Gain to a minimum value. 2. Increase Controller Proportional Gain until the actuator just starts to oscillate. Record the Period of the oscillation (Posc) and Controller Proportional Gain (Kosc). 3. Set Controller Proportional Gain = 0.45 Kosc and Controller Integral Gain = 1.2/Posc. This gives stable response. Test the actuator response and further refine the tuning until the desired performance is obtained. An SPC adjusted to an under-damped condition will be more responsive with less gain margin. It is more susceptible to instability due to changes in the system. An SPC adjusted to an over-damped condition will have slower response and better stability. It is less susceptible to instability due to changes in the system.

Configuring the Position Demand Source 

The position demand source is selected on the Position Demand page of the Configuration File Editor. The SPC can be configured as follows for the Position Demand Source. DeviceNet Only  The SPC Position Demand is received via the DeviceNet bus. DeviceNet Primary  The SPC position demand is received via the DeviceNet bus. The Analog Demand is used as backup. Analog Only  The SPC position demand is received on the Analog Demand Input.

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