ABB DCS 500B Description

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ABB DCS 500B Description Manual pdf 76 page image

Functional Software description68 DCS 500 Software DescriptionSee the jumper settings of the input range and constant currentgenerator in Chapter 2 "Standard hardware description". See alsoparagraph "Analog Inputs" in this chapter.Alarm and trip-ping limitsThere are parameters for thermal measurement (PT100, PTC) a-larm limit and tripping limit. If the measured temperature reachesthe value set in the alarm parameter, the program gives an alarmindication, MOTOR 1 TEMP. ALARM / MOTOR 2 TEMP. ALARM. Ifthe temperature keeps on rising and reaches the tripping limit, theprogram trips the drive and gives a fault indication MOTOR 1OVERTEMP. / MOTOR 2 OVERTEMP. Overtemperature fault be-longs to tripping level 2, which means that in case of overtempera-ture the main and field contactors will open. Fans keep running untiltemperature falls below the alarm limit.In the PT100-measurement the alarm and tripping limit parametersare set directly as Celsius-degrees. In the case of thermistor meas-urement (PTC) the limits are set as resistance values, (0...4000ohms). The alarm limits are set into parameters:Motor 1: MOT1.TEMP ALARM L (1402)Motor 2: MOT2 TEMP ALARM L (1602)The temperature tripping limits can be set by the:Motor 1: MOT1.TEMP FAULT L (1403)Motor 2: MOT2 TEMP FAULT L (1603)If the above parameters are set to zero, the alarm and tripping limitswill not be supervised.Example:Analog input channel 2 (AI2) has been selected for PT100-measurement of the motor windings (3 elements), and the analoginput channel 3 (AI3) has been selected for PT100-measurement ofthe motor bearings (2 elements). It is supposed that the alarm andtripping limits of the motor winding are 110°C and 120°C. The alarmand tripping limits of the bearings are 40°C and 50°C. The settingsin this case are:AI2 CONV MODE (107) = 5AI3 CONV MODE (110) = 4MOT1.[TEMP IN] (1401) = 10107 (connect to output AI2: 10107)MOT1.TEMP ALARM L (1402) = 110MOT1.TEMP FAULT L (1403) = 120MOT2.[TEMP IN] (1601) = 10110 (connect to output AI3: 10110)MOT2.TEMP ALARM L (1602) = 40MOT2.TEMP FAULT L (1603) = 50