ABB REM 610 Technical Reference Manual

Also see for REM 610: Operator's manual Product guide Installation manual Product guide Technical reference manual

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ABB REM 610 Technical Reference Manual Manual pdf 62 page image

Table 5.1.4.13.-11 CBFAILFeature ValueSet operate time 0.10...60.0 sPhase-current threshold for externaltriggering of the CBFAIL* pick-up/drop-off 0.13/0.11 x FLAThe accuracies apply only when the FLA secondary scaling factor hasbeen set to 1.5.1.5. Trip-circuit supervisionThe trip-circuit supervision (TCS) detects open circuits, both when the circuitbreaker is open and closed, and trip-circuit supply failure.The trip-circuit supervision includes:* Current limiter including the necessary hardware* Software-based function in the self-supervision systemThe trip-circuit supervision is based on a constant current injection principle: byapplying an external voltage, a constant current is forced to flow through theexternal trip circuit. If the resistance of the trip circuit exceeds a certain limit formore than 21 seconds, due to oxidation or a bad contact, for instance, the trip-circuitsupervision is activated and a warning appears on the LCD together with a faultcode. The warning signal from the trip-circuit supervision can also be routed to SO2by setting switch SGF1/8 to 1.Under normal operating conditions, the applied external voltage is divided betweenthe relay’s internal circuit and the external trip circuit so that at least 20 V remainsover the relay’s internal circuit. If the external trip circuit’s resistance is too high orthe internal circuit’s too low, due to welded relay contacts, for instance, the voltageover the relay’s internal circuit falls below 20 V (15...20 V), which activates the trip-circuit supervision.The operation condition is:U R R Ic xt s inj− + +( ) × ≥R e int 20 V ac/dc (3)U c = operating voltage over the supervised trip circuitIinj = current flowing through the trip circuit, ~1.5 mAR ext = external shunt resistorR int = internal shunt resistor, 1 kΩR s = trip coil resistance62REM 610REM 610 Motor Protection RelayTechnical Reference Manual - ANSI Version1MRS755537