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Certain alarms on the circuit monitor allow the user to configure the pickup and dropout setpoints in either absolute or relative mode. In absolute mode, the user enters the absolute values on which to alarm. In relative mode, the setpoints reflect a percentage of the running average of a particular value. The purpose of this knowledge base article is to describe the proper configuration of relative setpoints for the different models of circuit monitor.
Circuit Monitor 2000 Series (CM2000 or CM2):
On the CM2000, relative setpoints should be configured as the percentage of the offset from normal operation on which the user wants to alarm. In other words, the setpoints are configured from a reference of 0%. Most simply put, if the user wants to alarm when a value is 5% over the recent running average, he should enter a setpoint of 5%.
Circuit Monitor 3000 Series (CM3000 or CM3) & Circuit Monitor 4000 Series (CM4000 or CM4):
For the CM3000 and CM4000, relative setpoints are configured from a reference of 100%. Most simply put, if the user wants to alarm when a value is 5% over the recent running average, he should enter a setpoint of 105%.
*Note: Whenever possible, absolute alarm setpoints are recommended to ensure the most predictable and reliable alarming performance from the circuit monitor.