RELIANCE 770.90.10  57421  57412 framework

This step defines the Maximum position point. Alarm and shutdown conditions are checked by the SPC during this step, but a shutdown will not force the actuator current to zero. Use the Null Current Offset to adjust the actuator to the Maximum position.The new position settings can be verified at this step. Two set points are provided to allow easy step response testing. Dynamics settings and alarm and shutdown settings may be modified, if needed.

The SPC Service Tool window has several tabbed pages that allow adjustments to be made to the SPC. The Overview page includes a check box labeled Calibration will be performed through DeviceNet. When this box is checked, calibration can only be performed through DeviceNet. When this box is unchecked, calibration can only be performed using the service tool.

Working with a Running SPC

 Monitoring the SPC with the Input/Output Lines The SPC has several I/0 functions available for control and monitoring. These are: Analog (4 to 20) mA Position Demand Input The scaling for the analog position demand is user-configurable, that is, the 0 % and 100 % positions need not correspond exactly to 4 mA and 20 mA. Position Monitor Output The position monitor output gives an indication of the actuator position measured by the SPC. This output has fixed scaling such that 0 % position gives 4.0 mA and 100 % position gives 20.0 mA. Shutdown Input The SPC is shut down whenever the shutdown input terminals are open. For normal operation, the shutdown input terminals must be shorted.

Alarm/Shutdown Reset Input

 The Alarm/Shutdown reset input provides a way to reset alarms and shutdowns using a contact closure. The reset function is triggered by an open-to-closed transition on the reset input terminals. Shutdown Status Output The shutdown status output indicates when the SPC is shut down for any reason. A relay connected to this output can be made to de-energize whenever the SPC is shut down. Alarm Status Output The alarm status output indicates whether any SPC alarm conditions are present. A relay connected to this output can be made to de-energize whenever an alarm is active.

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