E. Control Systems
Safety Interlock
safety interlock, stage safety interlock, machinery interlock
What is a Safety Interlock?
A safety interlock is a device or system that prevents a machine from operating when unsafe conditions exist. In stage machinery, interlocks ensure that equipment cannot move if access gates are open, maintenance locks are engaged, or personnel are in danger zones.
How It Works
Safety interlocks use sensors (magnetic switches, RFID tags, proximity sensors) to monitor the state of guards and gates. The interlock is wired into the safety circuit so that opening a guard gate immediately stops all associated machinery, and the machinery cannot restart until the guard is closed and a deliberate reset is performed.
Key Components
Guard interlocksPrevent operation when access panels are open
Position interlocksPrevent conflicting movements
Key interlocksRequire a physical key to isolate power for maintenance
Related Standards
- EN ISO 14119 — Safety of machinery — interlocking devices
- EN 17206:2021 — Stage machinery interlock requirements