User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

Operating AssistanceExamples of Using AlarmsPresentationThe choice of which quantity is to be monitored and the alarm parameter settings are made using theRSU software (see Alarm Setup, page 125).Alarms on Superiority ConditionAlarms on superiority condition are dedicated to monitoring:• Overvoltages• Phase unbalance (Micrologic 6 E-M)• Overcurrents• Overfrequencies• Current unbalances• Power overruns• Total harmonic distortion (THD) overrunsThe value of the drop-out threshold must always be lower than the pick-up threshold.Example:Setting the overvoltage monitoring parameters (code 79, see Detailed Tables of Alarms, page 110) usingthe RSU software.5 24 311 Priority level: High2 Drop-out threshold: 420 V3 Drop-out time delay: 2 s4 Pick-up time delay: 5 s5 Pick-up threshold: 500 VAlarms on Inferiority ConditionThe value of the drop-out threshold must always be higher than the pick-up threshold.Alarms on inferiority condition are dedicated to supervision of:• Undervoltages• Underloads (Micrologic 6 E-M)• Underfrequencies138 LV434104 09/2009

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