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TDI-20 - Electronic Timer With Electrical Isolation
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| The TDI-20 is a heavy duty trapped key interlock switch controlled by a fail-safe timer and solenoid. The unit is designed to control access to hazardous machines with run-down times and can be used in high risk category 4 applications. The unit incorporates; a dual channel fail-safe timer; heavy duty continuously rated solenoid; solenoid position monitoring; 20A isolation switch; front panel lamp indication of solenoid position and timer failure, up to three lock centres for multiple access applications and an isolation switch "lock out 'feature. | ||||
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| In the machine running condition the access keys are trapped and the switch contacts 3N/0 3N/C. Turning the isolation switch to the off position, changes the contacts to the switch and initiates the timer. After a pre-set time (set to the run-down time of the machine) the timer energises the solenoid and releases the access keys. The key(s) can now be transferred to access interlocks fitted to the perimeter guard of the machine. In this condition the isolation switch cannot be retumed to the "on" position. The isolation switch can also be "locked off” with a padlock as an additional safety measure. The position of the solenoid is monitored by two safety switches. This feature enables an external dual channel safety relay to be connected to the two normally closed contacts of the safety switches. The safety relay will prevent the machine from being re-started in the event of solenoid failure. | ||||
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The TDI-20 is designed to operate as part of an integrated safety system, controlling access to hazardous machines. A typical example of machine isolation and access control using the BR4 safety relay and AIE dual key access interlocks with personal key is shown below.
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| • Solenoid (continuously rated), and timer (dual channel) controlled, control knob driven force break 20 amp switch (3NO 3NC contacts). • Solenoid position monitoring (suitable for Cat 4 if supported by other safety components). • Complete with IP65 rated enclosure or suitable for panel mount. • Power isolation - 400MA - 20A / Motor isolation AC - 23A 7.5KW or AC-3 5.5KW • Number of safety keys to suit your application (up to 3 standard). |
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