5-150 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.6 INPUTS/OUTPUTS CHAPTER 5: SETPOINTS
There is a possibility to monitor the trip circuit continuity not only via its auxiliary contact 52/a, but also with auxiliary
contact 52/b. This avoids the need to install a resistance in parallel with auxiliary 52/a. The correct connection is shown on
Figure 5-42: Supervision application with auxiliary contacts 52a and 52b (A6631F4)
The circuit works in a similar way to the one described in the previous section, but it uses both supervision inputs F15-F16
and F17-F18.
The advantage in this case is that circuit supervision with 52 open is more complete, as input V 52/b is used through
contact 52/b, (that is closed when the breaker is open).
We must point out that in this scheme, the tripping contact, shown in the example as the F650 trip relay, can be the one in
the relay (terminals F35 and F36), or be provided by another protection or by the parallel of several protections. This
provides high flexibility in the use of this circuit.
The battery voltage can also be monitored, by using one of the standard digital inputs.
5.6.5.7 With double voltage supervision and serial resistor in voltage monitors
Figure 5-43: Supervision application, auxiliary contacts 52a and 52b and series resistor in F15-F16shows the supervision
scheme with an external resistor.
An external series resistor is used with the 52a voltage monitor to prevent CB tripping with a short-circuited voltage
monitor. With CB open, 52/a is open and 52/b is closed. A shorted 52/a voltage monitor does not cause a trip because 52/
b voltage monitor is current limited to 2mA. With a shorted 52/b voltage monitor, no false trip is performed because 52/a is
in series limiting current to 2mA.
Healthy Open 52 closed ON OFF ON
Healthy Open 52 open ON ON ON
Healthy Closed 52 closed OFF OFF ON (if t < 500 ms)
OFF (if t > 500 ms)
Healthy Closed 52 open OFF ON ON (if t < 500 ms)
OFF (if t > 500 ms)
Defective Open 52 closed OFF OFF OFF (500 ms delay)
Defective Open 52 open OFF OFF OFF (500 ms delay)
Defective Closed 52 closed OFF OFF OFF (500 ms delay)
Defective Closed 52 open OFF OFF OFF (500 ms delay)
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