GE GEK-106465A instruction manual Operand Description, SUPCOIL2

HARDWARE

3.4.2. BOARD OPTION 2

Option 2 I/O board includes two groups of 4 inputs with one common, in terminals 9 to 10. It also includes 6 auxiliary outputs, in terminals 19 to 30 with normally open contacts and two current sensing (latching) outputs.

Besides, there are 2 groups of inputs for trip circuit supervision. The first group includes two isolated digital inputs, terminals 1-2 and 3-4. The second group, symmetrical and identical to the first, is formed by isolated voltage inputs 15-16 and 17-18.

Inputs in both groups are wet contacts, this means they need to receive a positive in the terminal labeled as + coming from a power supply whose negative is connected to the terminal labelled as -.

Using voltage detectors and current sensing, it is possible to implement several trip or close circuit supervision schemes, as well as protection of the unit output contact.

In order to implement these schemes, it is not necessary to perform any setting in the unit. Internal functions are always operative and provide the following logic operands:

A continuity failure is detected in a circuit when both voltage detectors (Va and Vb) detect lack of voltage during more than 500 ms. This function is not influenced by the breaker status.

These operands can be associated to internal signals (virtual outputs), LEDs or unit outputs, to issue alarm signals or to block elements, for example for blocking the Breaker close if an abnormality is detected in the trip circuit.

Available schemes are as follows:

1.Without supervision

2.With current supervision (with seal-in)

3.With simple voltage supervision

4.With double voltage supervision

5.With current and simple voltage supervision (with seal-in)

6.With current and double voltage supervision (with seal-in)