DKG-705 AUTOMATIC MAINS FAILURE AND REMOTE START ...
DKG-705 AUTOMATIC MAINS FAILURE AND REMOTE START ...
DKG-705 AUTOMATIC MAINS FAILURE AND REMOTE START ...
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DATAKOM<strong>DKG</strong>-<strong>705</strong> User’s Manual8. PARALLELING WITH <strong>MAINS</strong>: PEAK LOPPINGThe Peak Lopping feature consists on the use of the genset as a backup to the mains in caseswhere the mains power rating is insufficient to supply the load.The peak lopping application is only possible with slowly varying loads.When peak lopping is enabled and the unit is in AUTO mode, the genset will start and enter inparallel with the mains if mains power exceeds the parameter P_A29 (genset start limit). As the mainspower limit is not exceeded it will not supply power to the load.When the total load power exceeds the parameter P_A28 (mains power limit) the unit will allow themains to deliver only P_A28 (mains power limit) to the load. The exceeding quantity will be supplied by thegenset.When the total load power falls below the parameter P_A30 the generator contactor will releaseand the genset will stop following a cooldown cycle.The parameter P_A30 should be less than the parameter P_A29 in order to prevent immediatestopping of the genset after start.The unit includes a comprehensive set of protection functions to detect quickly a mains failureduring parallel with mains operation. The protections are enabled after the timeout defined by theparameter P_A23. These protections will be explained with more detail in the following chapter.If a mains failure occurs during parallel with mains operation, the mains contactor will immediatelydeenergize, a general Parallel Mains Fail warning and a specific protection function warning will begenerated. The load will be supplied by the genset without interruption. When mains is restored again, thegenset will synchronize with the mains and resume to parallel operation.The <strong>DKG</strong>-<strong>705</strong> has a set of programmable parameters to define the Peak Lopping operation. Allparameters used in No Break Transfer and Soft transfer are also used in Peak Lopping. Additionalparameters are:P_A27 Peak Lopping Enable: This parameter enables/disables the Peak Lopping operation.P_A28 Mains Power Limit: This is maximum active power that the mains may deliver.P_A29 Genset Start Limit: This is the mains active power limit for the start of the genset.P_A30 Genset Stop Limit: This is the total load active power for the stop of the genset.<strong>705</strong>-UE.doc - 26 -
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