User manual 09/2009 - Schneider Electric

The Protection FunctionAnalysis of OperationThe table below describes operation without the SDTAM module (diagram Ι)EventABCDCommentsApplication motor switches to steady state.Jam motor protection monitoring is activated.Occurrence of an overload current on the application (for example, rotor braked due to high viscosityof one of the mixing fluids)The Jam motor protection tjam time delay is actuated as soon as the motor current crosses the Ijampick-up.End of Jam motor protection time delayJam motor protection causes the Compact NSX circuit breaker to trip.Application returned to service manually after the motor has cooled and the circuit breaker has closedagain.The table below describes operation with the SDTAM module (diagram ΙΙ)EventABCDCommentsIdentical to diagram ΙIdentical to diagram Ι400 ms before the end of the Jam motor protection time delay, the SDTAM module:• Commands the contactor to open (output OUT2)• Sends a fault indication (output OUT1)Both outputs are activated for a time delay (which can be set between 1 and 15 minutes).Application contactor returned to service automatically: the time delay allows the motor to cool down.The SDTAM module can be set to the OFF position: the application is returned to service manually (bydeactivating the SDTAM module power supply).58 LV434104 09/2009