His attempts to solve the problem led him to isolate a safety circuit
and move off without checking that the train doors were properly closed.
Standard features include a feet-clear safety circuit
that automatically stops platform descent 9 inches above the floor surface to prevent foot entrapment; safety warning lights and an alarm to alert the operator before the platform lowers; platform and chain safety covers to guard against pinch points; an integrated approach ramp; and automatic platform lock that prevents rotation when lowered.
If the plant risk assessment has identified a higher category for a particular process, then it will be necessary to improve the reliability of the safety circuit
. This can be done by introducing additional redundancy, which in the example above would be the addition of a control valve that could shutdown the process in question in the event that the original contacts had failed.
The ALUPAC5000 also highlights its Smart Temperature Management technology, which constantly monitors the power bank's heat, consequently preventing it from overheating, and also with its Safety Circuit
Protection feature, your charged devices will be safe and protected from short circuits and battery self-discharges.
* An internal safety circuit
to prevent overcharging or deep discharge conditions.
An SIL2/PLd-certified, embedded safe torque-off feature helps prevent drive restarts after a safety circuit
is tripped, ultimately helping to protect personnel and equipment, and minimise production losses.
The Department of Buildings found in September that maintenance workers has failed to enable a door safety circuit
on an elevator moments before advertising executive Suzanne Hart stepped into the elevator and was pinned between the elevator and the shaft, causing her death.
SrA Hughes identified an A-10C aircraft flight safety circuit
failure by utilizing sound troubleshooting practices.
The application of programmable logic controllers for the control of machines brought the principle of the "parallel safety "(in parallel to the programmable controller a safety circuit
in conventional relay technology was often provided).
These switches are used to protect personnel by monitoring and interrupting the safety circuit
depending on the position of the machine guard.
Additionally, a high temperature safety circuit
shuts down the heater if the primary contactors fail, meaning that oil can never exceed 121AC, to prevent system damage and ensure worker safety.