The simplest interlock systems for machine guarding and access control involve the isolation of power, releasing of a key which is then used to unlock and open some form of access gate, door or hatch. Importantly, when the hatch (door or gate) is opened, the unlocking key becomes trapped and is held captive until the door is closed.These basic steps protect workers entering potentially dangerous guarded areas where machinery operates or live electricity can kill.
But how can you improve protection when, for example there is inertia in the moving parts, or the presence of a pressurized environment, or extremes of temperature?
This is done with a solenoid controlled key release interlock. Depending upon the nature of the hazard, the key interlock will not immediately release the key when turning off power.
Instead it works in conjunction with a relay or control switch, perhaps a pressure or temperature sensor. The system will be designed in such a way that the solenoid which traps the key will only draw back when safe working parameters are satisfied.
Click on the link or contact us to learn more about solenoid key release interlocks.
The full range of SecuMS trapped key interlocks is available now from Total Lockout (Safety) Ltd.
Contact:
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Unit 10 Warner Drive, Braintree, Essex, CM7 2YW: Tel: +44 (0)1376 325506
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