ABB AMVAC Installation And Operation Manual

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ABB AMVAC Installation And Operation Manual Manual pdf 40 page image

40 1VAL050601-MB Rev CAPPENDIX CELECTRONIC CONTROL BOARDCapacitor LifeThe standard 0.1 Farad Electrolytic capacitors are designed to be operated in the temperature range of --40°F to 185°F (--40°C to 85°C). The end-of-life corresponds to the point at which the capacitance decreases by20% or more.It is recommended that the replacement of capacitors be performed every 15 years for tropical climates and20 years for an average yearly temperature of less than 122°F.POWER CONSIDERATIONSThe control board power supply recharge unit adapts any voltage within the specified range of the board tomaintain 80 V across the capacitors. The following voltage thresholds must be reached to complete the speci-fied operations:1. The capacitor voltage threshold for an Open operation is 49 volts.2. The capacitor voltage threshold for a Close-Open operation is 72.5 volts.3. The capacitor voltage threshold for a Open-Close-Open operation is 78 volts.Apx. Table 3 CB Operations Vs. Available Capacitor ChargeCAPACITOR CHARGECIRCUIT BREAKER POSITIONCLOSE OPENEnergy sufficient for O-CO operations Open allowed Close allowedEnergy sufficient for CO operations Open allowed Close allowedEnergy sufficient for O operations Open allowed Blocked in open positionEnergy insufficient for any operation Blocked in closed position or CBopened (depending on dip switchsetting - I1004)Blocked in open positionProvided by Northeast Power Systems, Inc. (NEPSI)