The electromagnetic safety interlock keeps the test fixture securely closed throughout the test cycle.
Use cases
An electromagnetic safety interlock supports operator safety and a reliable testing process:
- It helps protect the operator by keeping the test fixture closed, particularly during high-voltage tests.
- It prevents the test fixture from being opened accidentally during a test.
- It supports the handling of failed assemblies: the test fixture remains closed until the operator deliberately presses a release button. This helps prevent failed parts from being mixed with passed parts during routine or busy work.
How the safety interlock works
Locking mechanism: When the test fixture closes, a solenoid-operated bolt engages with a metal tab, similar to a door lock, and mechanically locks the fixture. The bolt retracts only when the solenoid is energized, allowing the fixture to be opened. The fixture therefore remains locked if power to the solenoid is lost.
Control circuit: An integrated control board prevents the solenoid from overheating. Full power is applied briefly to retract the bolt. The voltage is then reduced while the bolt is held in the retracted position, minimizing power dissipation and heat buildup. The standard operating voltage is 12 V; a jumper allows switching to 24 V if required.
Redundancy: For safety-critical applications, all relevant components can be duplicated to support redundant operation.