GE GEK-106465A instruction manual Circuit Supervision and Contact SEAL-IN Circuits

I/O MODULES DESCRIPTION

5. INPUT/OUTPUT MODULES DESCRIPTION

5.1.CIRCUIT SUPERVISION AND CONTACT SEAL-IN CIRCUITS

5.1.1. CIRCUIT SUPERVISION

CIO units can include type 2 boards. This type of board includes 4 voltage detectors for implementing tripping or opening circuit supervision control logics.

5.1.2. CONTACT SEAL-IN

The current seal-in circuit is used for verifying the current condition in a circuit during the time that the tripping contact remains closed. If the current in the tripping circuit is maintained over 100 mA, the function is sealed independently of the status of the function that caused the trip.

This current seal-in function in tripping circuits is mainly used in applications where auxiliary contacts 52/a (in charge of cutting the current in the tripping circuit) are very slow. This may cause that, once the function that produced the trip is reset, the relay contact will open before the breaker auxiliary 52/a, even if the time delay of the first has expired.

By using this function, we prevent the relay contact from cutting the current (basically inductive and high) from the tripping circuit, which could cause damage to the unit, as these currents exceed the nominal breaking characteristics.

The circuit and the current threshold of the function are as follows:

100 mA min

I

FIGURE 5-1 CURRENT SUPERVISION

GEK-106465A CIO Remote CAN Digital I/O Module 31