SAPC38RCC  ABB  Power Board

In addition to that mentioned in the above sections, the self-supervision unit (IRF) monitors the operating voltage of the relay. If a fault is detected in the operating voltages, the self-supervision unit prevents the relay from operating. In addition, the “IRF” LED of the central unit is lit, and the IRF relay resets.

The self-supervision signal output operates on the closed circuit principle as presented in the figure below. Under normal conditions, the output relay is energized and the contact gap between 8 and 10 is closed. If the auxiliary power supply fails, or an internal fault is detected, the contact gap between 8 and 10 is opened.

When the “Trip Condition” key switch is in the “Current&Light” position, and the “Current&Light” LED is lit (normal operation), the overcurrent condition level is in use. Thereby both overcurrent and light are required for tripping. • Take the overcurrent condition level into use (overcurrent and light required for tripping) by using the switches SG1/1...4 (L1, L2, L3 inputs), or SG1/1...4 (L1, L3), and SG4/1...5 (L2). When the key switch is in the “Light” position and the “Current” LED is lit, the overcurrent condition level is not in use. Thereby only light is required for tripping. This option can be used, for example, during service.

Remember when constructing applications • Do not change connections or set any switches when the supply voltage is connected to the units. • Condition monitoring of a radial sensor fiber is not possible. When commissioning a radial sensor fiber, remember to set the SG3/4 switch in position ON. • Check the switches of the ports, when adding or removing extension units. Remember that the maximum number of extension units to be linked to one port is five, that is, ten extension units at the maximum can be connected to one REA 101 relay. Check that the terminal resistor of the last extension unit of either port is switched in the ON position (SG1/1). • When the circuit-breaker failure protection is used, it should be noted that the delay of the circuit-breaker failure protection is controlled by the overcurrent signal. Should the first trip be successful and the overcurrent disappear before the delay time runs out, no delayed tripping will occur. If the overcurrent situation lasts throughout the delay time, a delayed trip signal will be delivered. The “Trip Condition” key switch can be used to activate an overcurrent signal. Then the delayed trip function always operates in a trip situation, provided the circuitbreaker failure protection is in use. • Overcurrent information between two REA 101 central units has to be transmitted either over OPTOLINK connections and the signal transfer fiber, or over the connection cable of the extension units and the REA 105 unit, but not via both at the same time.

The structure and details of the product：

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