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| Safeguarding Applications Guard Locking Interlocks TLS1-GD2, Bulletin 800, CU1, Bulletin 100, Dual Channel 24V AC/DC Fuse Start Momentary Push Button K1 L1 L2 L3 K2 Lock Release Momentary Push Button Guard Closed A1 Stop Momentary CU1 Remote Push Button Indication Unit Fuses Solenoid 42 R2 R1 R3 54 TLS1-GD2 A1 + X1 R1 * 13 23 31 CU1 A2 41 12 22 53 34 A2 11 21 33 Contact Protection e.g. Thermal Cut Out - X2 R2 R3 14 24 32 M Bulletin 800 Latching E-Stop K1 K2 Bulletin 100S or 700S Circuit Status Circuit shown with guard door closed and locked (solenoid not energized), ready for motor starting (push start button) or lock release (push lock release button). Operating Principle In this system the guard is locked closed until the solenoid is energized. The solenoid can only be energized when: * The auxiliary contacts at K1 and K2 are closed. Therefore power contacts at KI & K2 are open. * The CU1 control unit has timed out for a pre-set period. At this stage the remote indication unit will show that the guard can now be opened by operating the lock release push button. When the locking mechanism is released, monitoring contacts 41-42 are opened. These contacts are in series with the contactor (K1) control circuit and will therefore prevent restart while the TLS1-GD2 is in the unlocked mode. If the guard is opened, contacts 11-12 and 21-22 are opened and will prevent restart while the guard is open regardless of the lock status. Fault Detection If either contactor K1or K2 sticks ON - the motor will stop but the guard cannot be opened (thus the fault is revealed to the operator). A short circuit fault on the solenoid energization circuit will initiate a STOP via contacts 41-42. A single fault within the CU1 will prevent the closing of its outputs (preventing solenoid energization). A short circuit fault across either terminals 11-42 or terminals 21-22 will not be detected but the motor cannot be started while the guard is open. A single short circuit fault across the E-Stop device will not be detected but will not prevent emergency stopping. An open circuit fault on the solenoid energization circuit will prevent guard opening (other than by the emergency release points on the TLS-GD2). Comments This system is a practical and effective method of providing an interlock function of increased integrity. It is suitable for applications where motion overruns after the stop command and the time taken to run down to a stop is predictable, consistent and less than approx. 30 minutes. The inclusion of the lock release push button means that the solenoid is only energized when guard opening is required. This prevents guard doors from swinging open whenever the control stop button is pressed. It also means that the solenoid is not left energized for long periods which can cause efficiency loss. The solenoids used in the Atlas and TLS-GD2 are continuously rated but, as with any solenoid, their action will be more positive when they are working at maximum possible efficiency. 18-14 |
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