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Trapped Key Switches 440T, ‘AB’ key in then ‘AC’ key out to open guard door
Trapped Key Switches 440T
• Interlocking for pre-determined sequence of events
• All stainless interlocking and coded parts
• Weather cap as standard
• Standard red color-coded key and ID tags
• A complete range of isolators, gate (guard) interlocks, key exchange units and specialty devices
• Meets the requirements of ISO 14119
• PLd, Cat 3 per ISO 13849
• Based upon the premise that a key cannot be in two places at once, trapped key interlock systems can be configured to provide that a predetermined sequence of events takes place or that hazards have been reduced before operators can become exposed to them.
• A trapped key interlock system is mechanical and is therefore widely used in applications including those where the location of plant, environment, or explosive atmospheres make the use of electrical interlock systems unsuitable or expensive to install.
• In addition, unique coding can be provided, leading to a greater degree of security and tamper-resistance.
• In order to derive the full benefits from a trapped key interlocking system its components must be totally practical, easily maintainable, and readily available.
• The unique key and code barrel of Prosafe® gives the ability for even complicated interlocking systems and spare parts to be ordered from our worldwide network of distributors fast – which is a first for trapped key interlocks.
Trapped Key Switches 440T Sequence of Operation
• The Solenoid Release Unit (SRU) is used for electrical isolation of machinery to improve safe access.
• It consists of a rotary power switch and a solenoid.
• The trapped key can be removed once an external signal is given to its internal solenoid locking mechanism.
• An indicator light on the solenoid release unit indicates when the trapped key “AA” key can be removed.
• Insert the “AA” key into the Key Exchange Unit (KEX) and turn it 90°.
• Turn one of the “AB” keys 90° and remove it from the KEX.
• This traps the “AA” key in the KEX and prevents the restarting of the machine.
• Insert the “AB” key into the Single-key Bolt Lock (SBL) and turn it 90° to gain partial body access to the machine.
• Turn the second “AB” key 90° and remove it from the KEX.
• Removal of this key also traps the “AA” key in the KEX and prevents the restarting of the machine.
• Insert the “AB” key into the Dual-key Access Lock (DAL) and turn it 90°.
• Turn the “AC” key 90° and remove the “AC” key.
• Rotate the access handle to allow full body entry into the hazard zone.
• Take the “AC” key into the hazard zone, insert it into the rotary key switch (RKSE) and turn it 90° to send a signal to the machine control system, to allow the machine to operate in a slow or teach mode.
• Reverse the process to return the machine to full operational mode.
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