Appendix B:
Automatic Waveform Capture and Waveform Retrieval on EPM3720
Using a setpoint to trigger waveform capture or record on the EPM 3720
When a Setpoint is programmed from the MMI, the EPM3720 has the ability to automatically capture or record waveforms based on the value of a specified parameter. In order to display a Waveform Capture, the meter takes 128 samples from a full cycle of any single selected channel. For a Waveform Record, the meter takes 16 samples per cycle from multiple cycles on all 8 inputs simultaneously. The device will store 36 cycles of 1 event, 18 cycles of 2 events, or 12 cycles of 3 events, depending on the Record Depth programmed by the user. Please follow the instructions below to use a Setpoint to trigger a waveform capture or record on the EPM3720.
For explanations of what the EPM 3720's various parameters mean, refer to the EPM 3720 Users Guide, in the section titled Sliding Window Demand.
1.In the EPM3720 MMI tabular screen, click on the Setpoints tab.
2.Choose an unassigned setpoint number. Either Standard or High Speed may be used, but High Speed is recommended for quicker response. (See Section 6 of the 3720 ACM Installation & Operation Manual for more details on configuring Setpoints.)
3.Based on the parameter that will be set in the Trigger Key, select the Setpoint Type.
4.Set the Trigger Key. The Trigger Key is a code for the parameter that, when its value passes a set limit, triggers an Action. Refer to the table in this section for a list of Trigger Key codes.
5.Enter the High and Low Limits as well as any Time Delays to operate and release.
6.Select the required Action. To record a waveform, choose Waveform Recorder. For Waveform Capture, remember that the waveform of only one input may be automatically captured. Choose Waveform
