Movable guards are generally connected mechanically to the machine frame or to a fixed part close to the machine. The guard may be hinged or rail-mounted. They can be opened without using a tool and are only effective when they are closed.
Movable guards
Interlocking devices as safety solution
Movable guards may be associated with an interlocking device. When a safety gate is opened, for example, the interlocking device ensures that hazardous machine functions are stopped and an unexpected restart is reliably prevented.
Standards for movable guards
| Standard | Title |
|---|---|
| EN ISO 14120 |
Safety of machinery |
| EN ISO 14119 |
Safety of machinery - Interlocking devices associated with guards. Principles for design and selection |
Protection against unexpected start-up/restart of a machine
Once a safeguard has been triggered, a machine may not be restarted automatically after the protected field has been cleared. A restart is only possible via a reset on a control device outside the danger zone, with visual contact.
This is relevant, for example, when the energy supply is restored after an interruption or when a drive starts up unexpectedly due to a faulty control system.
Standard to protect against unexpected start-up/restart
| Standard | Title |
|---|---|
| EN ISO 14118 |
Safety of machinery |
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