LayerZero Power Systems Static Transfer Switches save all events into a timestamped "Black Box" for analysis and post-incident reconstruction. All events are documented in the internal "Black Box", and may be viewed as "summarized events" by users on the "Event Log" page on the eSTS GUI. Access to black box data is accessible both locally and remotely.
Some events cause the action of posting an alarm, while other events
cause the action of clearing an alarm. LayerZero Power Systems provides an ‘Alarms Troubleshooting Reference’
document which provides a list of each alarm
message, the urgency that it indicates, a
description of what can cause that alarm,
and a description of the steps to perform to
troubleshoot the alarm condition.
Common events include:
• Alarm Set or Cleared
• GUI & Web page selects
• CB state change
• Source availability change
• Waveform captured
• SCR gating change
• Source quality change outside of limits
• User logged in or out on the GUI
Full and complete event data is stored internally, and this data can be analyzed when needed by LayerZero engineers.
Standard mission-critical power machines have traditionally provided rudimentary data to the user regarding catastrophic events. Some common complaints about this conventional event recording include:
1. Successive events are too far apart in time to be useful;
2. Event records tend to be vague and lead to more unanswered questions;
3. Event records only take a snapshot of the actual event and provide no information regarding the status of equipment parameters before and after the event.
4. Some events are missed entirely.
A natural outcome of these shortcomings is that eradication of the root-cause of the alarming event does not occur. The event then systematically becomes an "out-of-the-ordinary" academic acknowledgment. Conventional power event recording schemes do not satisfy the needs of the modern, sophisticated facility engineer who needs "quality" information.
To eradicate these problems, LayerZero has borrowed cutting-edge concepts from the aviation industry's "Black Box" principle. The concept, as applied to the eSTS, is simple:
1. Provide successive event information with ten microsecond resolution;
2. Provide a brief snapshot of each event with a lead-in for further inquiry; and
3. Provide a real-time status indicator of all machine parameters at the exact instant of each recorded event.
A High Level Processor is supplied with a compact flash disk. Communication is via fiber optics and the result is a "Black Box" data recorder. Event logs, alarms, diagnostics and Waveform Capture are accessible via a VPN Router that comes standard with each unit. Time-stamping resolution is 10 microseconds; fast enough to catch any mechanical or electrical activity. Each transfer event as well as transfer-inhibit event is captured and stored on solid state memory in the form of a real-time waveform capture three cycles before and three cycles after an event.
The root cause analysis of the electrical system is facilitated by the Black Box.
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