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TEB - RESTART AND REACCELERATION RELAYS

TEB - RESTART AND REACCELERATION RELAYS. Relay for Motor Restart and Reacceleration. Designed to perform the automatic motor restarting, after dead line or a momentary line voltage interruption or drop-out. Without any supplying it is still working.

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TEB - RESTART AND REACCELERATION RELAYS

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  1. TEB - RESTART AND REACCELERATION RELAYS Relay for Motor Restart and Reacceleration • Designed to perform the automatic motor restarting, after dead line or a momentary line voltage interruption or drop-out. • Without any supplying it is still working. • Can be employed in conjunction both with contactor based Motor Control Circuits, and with circuit breakers having current injection closing and trip coils.

  2. TEB - RESTART AND REACCELERATION RELAYS Relay for Motor Restart and Reacceleration • Operates in case of voltage interruptions or when the line voltage drops below 80%Un. • At the instant when contactor opens TEB begins to count the duration of voltage interruption. • When voltage restores the TEB presents an operating mode depending to the interruption time and setting mode. Defining tIR Immediate Reacceleration preset time tM Delayed restart preset time tDR Restart Delay Time tVR Voltage Restoring Time

  3. TEB - RESTART AND REACCELERATION RELAYS Function Principles 3 different operation cases

  4. TEB - RESTART AND REACCELERATION RELAYS Example of Setting desired delayed restart preset time tM = 3.6 s decomposition in the sum of single contributions tM = 3.6 s = 10 x 0.36 s = 10 x Σ (0.02 + 0.04 + 0.1 + 0.2) s

  5. TEB - RESTART AND REACCELERATION RELAYS Electrical Connection • The contactor auxiliary contact A gives to the TEB the information about the contactor state; therefore its opening determines the counter to start. • E can be preset as pulse (PULSE) or permanent (PERM) operating modes. • PULSE for contactor provided with self-latching contact R. • PERMANENT is suitable when an auxiliary contact R is not available to perform the contactor self-latching function.

  6. TEB - RESTART AND REACCELERATION RELAYS Example of Operating Mode: Restart Motor running

  7. TEB - RESTART AND REACCELERATION RELAYS Example of Operating Mode: Restart Motor not supplied

  8. TEB - RESTART AND REACCELERATION RELAYS Example of Operating Mode: Restart Voltage Restored after tIR < tVR< tM When t=tVR+tDR Led switch-off and E is closing

  9. TEB - RESTART AND REACCELERATION RELAYS Stop or continue to count Every opening pushbutton above X3determines the stop of the motor and the clearing of TEB; In the same way, in case of presence of Uc, TEB is cleared if motor is stopped for a voltage drop.

  10. TEB - RESTART AND REACCELERATION RELAYS Stop or continue to count The opening of any lock-out contact below X3 determines the stopping of the motor and the clearing of TEB; The opening of such a contact during the timing sequence following the stop of the motor caused by a voltage drop, doesn't determine the clearing of TEB, therefore at the end of the timing sequence TEB closes its output contact E

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