Comparison of Legal Requirements: The Machinery Directive vs. the Machinery Regulation
1.2.6. Failure of the power supply (or communication network connection)
Changes
Here is an expansion of the legal requirements:
- Requirement expanded: "power supply or connection to the communications network" replaces only "power supply"
- New requirement: "connection to the communications network"
Proposed measures
- Identify whether the machine depends on communication networks (e.g. fieldbus, Ethernet, wireless communication, remote control, cloud services)
- If yes: analyze what happens in the event of:
- communication loss
- delay/latency
- incorrect signal/data
- reconnection after interruption
- Ensure that faults in the communication network do not lead to hazardous situations
- Verify that the machine transitions to a safe state in the event of communication failure (e.g. stop, safety function, degraded mode)
- Ensure that restart after communication is restored does not occur in an uncontrolled manner
- Update the risk assessment so that communication-related faults are included as a hazard source
- If necessary: update the control system/architecture (e.g. watchdog, timeout, fail-safe signals)
Machinery Directive statutory text
1.2.6. Failure of the power supply
The interruption, the re-establishment after an interruption or the fluctuation in whatever manner of the power supply to the machinery must not lead to dangerous situations.
Particular attention must be given to the following points:
— the machinery must not start unexpectedly,
— the parameters of the machinery must not change in an uncontrolled way when such change can lead to hazardous situations,
— the machinery must not be prevented from stopping if the command has already been given,
— no moving part of the machinery or piece held by the machinery must fall or be ejected,
— automatic or manual stopping of the moving parts, whatever they may be, must be unimpeded,
— the protective devices must remain fully effective or give a stop command.
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Machinery Regulation legal text
1.2.6. Failure of the power supply or communication network connection
The interruption, the re-establishment after an interruption or the fluctuation in whatever manner of the power supply or communication network connection to the machinery or related product shall not lead to hazardous situations.
Particular attention shall be given to the following:
(a) the machinery or related product shall not start unexpectedly;
(b) the parameters of the machinery shall not change in an uncontrolled way when such change can lead to hazardous situations;
(c) the machinery or related product shall not be prevented from stopping if the stop command has already been given;
(d) no moving part of the machinery or related product or piece held by the machinery or related product shall fall or be ejected;
(e) automatic or manual stopping of the moving parts, whatever they may be, shall be unimpeded;
(f) the protective devices shall remain fully effective or give a stop command.
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