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Safety Briefing at the Press

The light curtain on a hydraulic press reports a fault in the middle of an urgent order. A colleague has a quick fix. What do you do?

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Situation at press HP 250

What	Status
Display	light curtain fault
Press	stopped, hydraulics on
Order	120 of 400 by 14:00
Colleague	“use the setup key”
Instructions, pt. 4	safety faults: maintenance only

Situation at press HP 250 in the fictional company Metallbau Ostend: the display shows a light curtain fault, the press is stopped with the hydraulics still running, 120 of 400 parts are done, a colleague suggests the setup key. Point 4 of the operating instructions: faults on safety devices are fixed only by maintenance.

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Press HP 250 stops. The display shows “Light curtain fault”. 280 of 400 parts are still due by 14:00. Your colleague says: “Use the setup key, it works in jog mode.” What do you do?

Switch off at the main switch, lock it with your own padlock, hang a sign and call the shift lead and maintenance.Switch off at the main switch and wait next to the press for maintenance; no lock is needed while you stay there.

Show a hint

Ask two questions: Is the protection still working? Could anyone switch the press back on?

About this activity

What you practise: You made a machine safe under time pressure: stop, lock with your own padlock, mark it and call the people responsible.

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Press HP 250 stops. The display shows “Light curtain fault”. 280 of 400 parts are still due by 14:00. Your colleague says: “Use the setup key, it works in jog mode.” What do you do? Situation at press HP 250 in the fictional company Metallbau Ostend: the display shows a light curtain fault, the press is stopped with the hydraulics still running, 120 of 400 parts are done, a colleague suggests the setup key. Point 4 of the operating instructions: faults on safety devices are fixed only by maintenance. The light curtain is what stops the ram when a hand is in the danger zone. With a fault, that protection is gone, and the setup key would bypass it. Switching off is not enough: only your own lock stops someone else from switching back on while you look away. Point 4 of the operating instructions says faults on safety devices are fixed only by maintenance. The 280 parts are the shift lead's problem, not a reason to take the risk.