Understand the fundamentals
Status describes behavior
Offline usually means the monitoring system cannot communicate with a machine. Stopped can mean the chips are no longer hashing. Powered off can mean different things, depending on which supplies or controls were switched off. Isolated means authorized personnel have separated the energy sources from the equipment under an approved procedure. A verified safe energy state means authorized personnel have checked the equipment and confirmed it is safe for the task. Offline, stopped and powered off are not the same as a verified safe energy state.
For example, if a miner loses its wired network connection (Ethernet), it can disappear from the dashboard. Its power supply can still be energized, meaning connected to live electrical power. Software can also stop the chips while electrical power still reaches the machine. So a screen cannot tell you that the electrical parts inside are safe to touch.
A stopped process is not an isolated energy source
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See how it works
Energy can remain after motion stops
Some electrical parts can hold stored energy even after the machine stops. Cooling systems can stay hot or stay under pressure. Controls can also restart equipment without warning. Which energy sources and controls matter depends on the machine and how it is installed. No single wait time or software command proves that every miner is safe to work on.
An energy-control procedure, often called lockout/tagout, is the site’s approved process for making equipment safe to work on. Each procedure is written for specific equipment at a specific site. Under it, authorized personnel identify the energy sources, apply the required controls and verify the condition before work starts. This course explains why that process matters. It does not give you a replacement isolation procedure. It does not authorize you to carry out electrical checks.
Connect it to the field
Use precise language in a handoff
A handoff is the note you pass to the next person on the job. Compare “the unit is safe” with “the dashboard reports offline; physical energy status has not been verified.” The second note tells the next person what is known. It also says what still needs checking by authorized personnel. It does not turn a network observation into a safety promise.
If your assigned task requires reaching parts inside a machine, the approved safe-work process must come first. That includes energy control. Feeling sure because the unit seems quiet is not enough. If anything is unclear, ask the responsible person before you continue. Never remove another person’s lock; it keeps the equipment from being switched on while they work. An interlock is a safety device that stops equipment from running in an unsafe condition, such as an open cover or door. Never bypass an interlock to make a task easier.
Terms used in this lesson
- Stopped
- The machine is not doing its normal work.
- Isolated
- Authorized personnel have separated the energy sources from the equipment under the approved procedure.
- Verified safe state
- Authorized personnel have completed the required checks and confirmed the equipment is safe for the task. A screen message cannot do this.
Optional references & further reading
Use current manufacturer instructions for the exact equipment and your site’s approved procedures. Course levels do not grant task authorization.