ABB DCS 500B Description

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ABB DCS 500B Description Manual pdf 80 page image

Functional Software description72 DCS 500 Software DescriptionAlarm and tripping limits can be selected by means of four pa-rametersMODEL1.ALARM L (1407)MODEL1.TRIP L (1408)MODEL2.ALARM L (1506)MODEL2.TRIP L (1507)Initial values are selected so that the overloadability is quite high.For example, the current must continuously be √120 * 100 = 109.5% before alarm is given and for trippings the current must be √130 *100 = 114 %.Recommended value for alarm is 90...100% and for tripping106...110%.MODELx.ALARM L (xxxx) = (alarm %2/100)MODELx.TRIP L (xxxx) = (trip %2/100)Example. The tripping limit is 106% --> MODELx.TRIP L (xxxx) =112Thermal timeconstantTime constants for thermal models are given by two parametersMODEL1.TC (1409)MODEL2.TC (1608)It has to be noted that the thermal time constant cannot be used di-rectly when calculating the tripping time. Often the motor manufac-turer presents a curve that defines how long the motor can beoverloaded with a certain overload factor. Parameters MODEL1.TC(1409) and MODEL2.TC (1608) can be selected by means of figureon the next page.