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What checks should be carried out if the machines are restarted?

The industrial sector, and machine work in particular, involves a number of safety rules. One of the most important of these is to observe certain rules when restarting machinery. Whether you work on hydraulic equipment or other types of machinery, there are a number of rules and instructions that apply across the board and must be followed scrupulously. So what checks should you carry out? We'll get straight to the point!

When does this kind of situation arise?

Generally, when we have to restart machinery, it's because of an emergency stop.

Of course, there are also cases where this happens as a result of power cuts or other reasons, but these are more anecdotal.

When an emergency stop occurs, it's generally because there was a risk to the equipment or to people. So, before considering restarting the machine, you must of course check scrupulously that all sources of problems have been eliminated and that it is safe to get back to work.

If there has been damage to the machines, you will obviously need to ensure that any repairs have been completed and that everything is ready to go again without risk to users or the equipment.

In short, when faced with a restart, you need to make sure that the machine is in a normal state to resume its work before starting it up again.

Once these usual precautions have been taken, all that remains is to observe, with great rigour, a whole series of restarting steps which will complete the process of guaranteeing the safety of the process and the optimal restarting of our tools.

But what are these steps?

Machine restart stages and checks

Generally speaking, as mentioned above, this restart is not a simple start-up. It is a cancellation of an emergency stop procedure, and therefore a deactivation of the emergency stop procedure.

Before deactivating it, it is necessary to test whether the safety inputs comply with normal operation, and thus know whether or not the machine is fit to restart. Unlike a normal ignition, each part of the safety device must be inspected to check that everything is in order.

Once this has been done, the machine needs to be reset before it can be restarted. Depending on the case, this reset may be manual or automatic. Manual rearming requires a certain amount of vigilance, whereas automatic rearming will not be triggered until all the conditions for restarting have been met.

As manual reset relies on the operator's vigilance, it can be made conditional on a certain number of vigilance rules:

  • It should only be carried out once all the safety and protection functions have been checked and are in working order.
  • It should only be carried out if it does not trigger a dangerous situation.
  • It must be the result of thoughtful and careful action, after scrupulous examination of the safety procedures and the general condition of the machine.

Only then can rearming be considered. It is clear, then, that in the case of manual restart, vigilance is all the more necessary, because the risk of human error is greater. In fact, automatic retry is conditional on the machine fulfilling and validating a certain number of requirements.

According to ISO13849: 2015-1, the reset actuator must be located outside any potentially hazardous area. When the actuator is restarted, the operator must not be exposed to any danger due to his presence on site.

The actuator must be highly visible and in a position where it can be seen that, during restart, no personnel on site are in danger of being injured or any equipment damaged by the restart.

Only under these conditions can the reset be carried out and the machine restarted.

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