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The following circuit examples have been harmonized with the German Trade Association BG and have been approved. In this particular case, only Stop Category 0 is possible.
Additional contactors in series are not permitted. Safety circuits using individual contactors Configured using two auxiliary contactors Safety circuits of any complexity can be configured using auxiliary contactors. This circuit offers redundancy. However, due to the fact that the contacts are not positively driven, the two auxiliary contactors do not mutually monitor each other for correct functioning. This means, that if a contact welds, this fault is not detected and the circuit still continues to function.
A subsequent fault in the second contactor could completely disable the combination. This would mean that the level of safety would no longer be guaranteed. Using three auxiliary contactors Today, circuits with three auxiliary contactors represent state-of-the-art technology. The three auxiliary contactors guarantee redundancy and function monitoring. The positively-driven contacts guarantee that the auxiliary contactors mutually monitor themselves. Faults are therefore detected and the circuit can no longer be closed after shutdown, therefore eliminating subsequent faults.
With this circuit, using todays stateof-the-art technology, it can be assumed that if the auxiliary contactors incorrectly function this will not result in a hazardous status in the system. Several auxiliary contactors are combined to form a safety circuit in the form of the 3TK28 contactor safety combinations.
Naturally, the circuits. Circuit examples to monitor protective devices Circuits to monitor protective devices use position switches. The number of position switches which are required for each protective door can be taken from Section 2 of the Manual. The internal circuit diagrams are valid for DC-operated devices. Only the polarity protection diode V1 is eliminated and a bridge rectifier is located in front of every contactor.
Immediately ready after the power returns it is not necessary to open and close the protective device : The Ready ON f is not required jumper X5-X6 , if the resulting automatic reclosure restart does not represent potential danger. This circuit can also be used for the 3TK28 05 Cat. L1 L2 Automatic restart is only permitted for protective monitoring in exceptional cases. If an automatic restart cannot result in a hazardous condition, then Ready ON is not required. Classification in Categories according to EN The classification of circuits into categories according to EN has now been made clear using the previous examples.
The classification below, is valid when the wiring is correctly realized according to the published circuit diagrams, also under difficult ambient conditions, for example dirty industrial environments pollution level 3. If special care is taken connecting-up the wiring, it may be possible to achieve a higher safety category, e. Thus, Category 4 can be achieved without having a cross-circuit proof configuration, under the assumption, that the appropriate peripheral devices are used.
Category acc. Possible equipment Possible with all basic- and expansion devices 3TK, 3TK28 06, 3TK28 07, also in conjunction with one or several expansion units 3TK28 05 and 3TK also in conjunction with one or several expansion units. One expansion unit can be connected for each enabling contact in the basic unit. The signaling contact in the expansion unit must always be connected in series with Ready ON. The Category which a circuit with an expansion unit can achieve according to EN depends on the Category of the basic unit with interface.
If the expansion unit is located next to the basic unit in the cabinet, the connecting cables between the basic unit and expansion unit are so short, that a fault electrical fault can be completely ruled-out in these connecting cables. The 3TK The delay time is set using different jumpers at connecting terminals Y2, Z1, Z2 and Z3. If required, more than one expansion unit can be connected to a basic unit as shown here in the example. In this example, 5 expansion units can be connected.
This circuit can also be realized using the 3TK28 05 unit. This circuit can also be used with the 3TK28 Press control devices Circuit examples for presses The two devices, two-hand control device 3TK28 11 and overtravel tester 3TK28 15 are used for press controls.
Two-hand control device 3TK28 11 The two-hand control device 3TK28 11 is a control which allows presses to be controlled using two hands. For presses, it must be ensured that both hands are required to control the presses. If one actuator device is released, then the control stops the hazard-ous motion. If the 0. It should also be observed that the switching currents for the control devices are 50 mA at 24 V DC.
It may be necessary to use gold-plated contacts. Control interlocking functions are switched in the feedback circuit. Each time that the power supply is switched-on at the two-hand control device 3TK28 11, the braking travel is checked using the 3TK28 After the two-hand operation console is released, the ram automatically travels to upper dead center.
ON monitoring ON is pressed fault! The PTC goes into a high-ohmic state. None of the LEDs are lit. The evaluation unit can be operated, both with automatic restart as well as with monitored start. The start button is not necessarily required. Monitoring several protective doors with evaluation unit up to Cat.
If one of the eight magnetically-operated switches is actuated the protective door is opened , then the unit stops. There is a PLC signaling output switching to p for each input. The fail-safe shutdown is realized using two relay safety outputs. If an input is not used, then the appropriate terminals of the NO contact must be jumpered. For limited safety requirements, the evaluation unit can also be used without a start button.
Degree of protection acc. Sequence after the press has been powered-up: 1. The hydraulic pump is poweredup with S5, the ram is moved up to upper dead center, if required, using S6.
Press S1, S2 at the two-hand operating console until the position switch for the test cams S4 opens. Release S1, S2. Release S1, S2: The ram returns to the upper dead center. If the overtravel is OK, all of the outputs remain active until the control voltage is disconnected.
Fault situation If the cam actuates position switch S4, then the signal lamp H1 is not lit-up. The machine part, which is potentially hazardous, can then only be moved to the upper dead center using S6. This press can then no longer be used. Contact the technician to check the press. A more detailed description of the function of the 3TK two-hand control device is provided in the Instruction Manual, Order No.
S6 is pressed, K2 pulls-in the ram moves upwards in the manual mode. The upper dead center is reached, S3 is actuated. S6 is released, K2 drops-out. S1 and S2 are pressed on the two-hand operating console, the two-hand control device 3TK outputs an enable signal, K3 and K4 pull-in. The ram moves downwards, S3 is no longer actuated. Test cams are reached, S4 is actuated, K3 drops-out. The ram remains stationary, S1, S2 are released, K4 drops-out.
S1, S2 are pressed, K4 pulls-in again, H1 lights up. S1, S2 are released, K4 drops-out. K2 pulls-in, the ram moves upwards. S4 is no longer actuated. Upper dead center is reached, S3 is actuated. S1 and S2 are pressed; K2 drops-out, K3 and K4 pull-in.
S1, S2 are released, K3 and K4 open. K2 pulls-in. Overtravel tester is inhibited. The permissible overtravel s corresponds to the length of the cam which actuates position switch S4. All of the connecting cables must be screened. For an automatic re-start, a jumper must be inserted between terminals T11 and X2. Terminals AML and 53 must be jumpered to simulate a muting lamp as this isnt required in this case.
If one of the safety outputs at the light curtain opens, the evaluation unit shuts down. It is mandatory to use a muting lamp white and this is monitored via the evaluation unit terminal The start button cannot be bypassed. Automatic re-start is not possible. Terminal 63 can have a maximum 1. In order to avoid an overload condition, the receiver ground must be connected to terminal
3TK2804 Datasheet PDF
The following circuit examples have been harmonized with the German Trade Association BG and have been approved. In this particular case, only Stop Category 0 is possible. Additional contactors in series are not permitted. Safety circuits using individual contactors Configured using two auxiliary contactors Safety circuits of any complexity can be configured using auxiliary contactors. This circuit offers redundancy.
3TK2804 Combination. Datasheet pdf. Equivalent