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Opening, closing and resetting the 3VA molded case circuit breaker

Opening and closing in MANUAL mode

The plastic window is open, the motor operator is in MANUAL mode. The supply to the LEDs is also disconnected, but the motor operator remains fully operational.

  • Close the 3VA molded case circuit breaker:
    Turn the handle clockwise until the switching position indicator displays ON (I).
    The molded case circuit breaker is now ON (I). The main contacts are closed.

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  • Open the 3VA molded case circuit breaker:
    Turn the handle clockwise until the switching position indicator displays OFF (O).
    The molded case circuit breaker is now OFF (O). The main contacts are open.

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Opening and closing in AUTO mode

The plastic window is closed, the motor operator is in AUTO mode. The 3VA molded case circuit breaker can be closed or opened only under the control of electrical signals.

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  • Close the 3VA molded case circuit breaker by means of an electrical ON signal at the terminal block:
    The molded case circuit breaker is ON (I). The main contacts are closed. The switching position indicator on the front panel of the motor operator displays ON (I).

  • Open the 3VA molded case circuit breaker by means of an electrical OFF signal at the terminal block:
    The molded case circuit breaker is OFF (O). The main contacts are separated. The switching position indicator on the front panel of the motor operator displays OFF (O).

Resetting the molded case circuit breaker

If the 3VA molded case circuit breaker has tripped, the LED labeled "TRIP" lights up

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Reset mode setting

The method by which the 3VA molded case circuit breaker is reset by the motor operator depends on the selected reset mode.

Reset modes

The reset mode can be selected. After the molded case circuit breaker has tripped, the selected reset mode determines the response of the motor operator in the TRIP position.

Motor operator response to tripping of the 3VA molded case circuit breaker depending on the reset mode selection:

Connection diagram for control of the motor operator MO320

NOTE

An EMERGENCY-STOP circuit is implemented by means of shunt trips.

For further circuit diagrams, see chapter "Circuit diagrams".

The M0320 motor operator is edge-controlled, i.e. it reacts only to the positive edge of an ON or OFF command at the relevant terminals 3 and 4. In this case, the OFF signal is dominant, i.e. the motor operator will be switched off in response to an OFF edge even if an ON signal is applied.

The MO320 requires a pause period of 80 ms between the end of an OFF signal and the edge of an ON signal. Since the OFF signal is dominant, it does not require a pause period.

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