GE 469 Instruction Manual

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Contents

CHAPTER 5: SETTINGS469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–61If turned On, the Mechanical Jam element function as follows. After a motor start, a Tripoccurs once the magnitude of Ia, Ib, or Ic exceeds the Pickup Level × FLA for a period oftime specified by the MECHANICAL JAM DELAY settings. This feature may be used toindicate a stall condition when running. Not only does it protect the motor by taking it off-line quicker than the thermal model (overload curve), it may also prevent or limit damageto the driven equipment if motor starting torque persists on jammed or broken equipment.The MECHANICAL JAM PICKUP level should be set higher than motor loading during normaloperation, but lower than the motor stall level. Normally the delay is set to the minimumtime delay or set so that no nuisance trips occur due to momentary load fluctuations.5.7.4 UndercurrentPATH: SETTINGS ZV S6 CURRENT ELEM. ZV UNDERCURRENTA trip or alarm will occurs once the magnitude Ia, Ib, or Ic falls below the pickup level × FLAfor the time specified by the UNDERCURRENT ALARM DELAY. The Undercurrent element isactive only when the motor is running. It is blocked upon the initiation of a motor start forthe time defined by the U/C BLOCK FROM START settings (e.g. this block may be used toallow pumps to build up head before the undercurrent element trips). A value of “0” meansthe feature is not blocked from start. If a value other than “0” is entered, the feature isdisabled when the motor is stopped and also from the time a start is detected until thetime entered expires. The UNDERCURRENT ALARM PICKUP level should be set lower thanmotor loading during normal operations.UNDERCURRENT [BLOCK UNDERCUR-RENTRange: 0 to 15000 s in steps of 1MESSAGE UNDERCURRENTALARM: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN ALARMRELAYS:Range: Alarm, Alarm & Auxiliary2,Alarm & Aux2 & Aux3,Auxiliary2, Aux2 & Aux3,Auxiliary3MESSAGE UNDERCURRENTALARMRange: 0.10 to 0.95 x FLA in steps of0.01MESSAGE UNDERCURRENTALARMRange: 1 to 60 s in steps of 1MESSAGE UNDERCURRENTALARMRange: On, OffMESSAGE UNDERCURRENTTRIP: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN TRIPRELAYS:Range: Trip, Trip & Auxiliary2, Trip &Aux2 & Aux3, Trip & Auxiliary3MESSAGE UNDERCURRENT TRIPPICKUP: 0.70 xRange: 0.10 to 0.99 x FLA in steps of0.01MESSAGE UNDERCURRENT TRIPDELAY: 1 sRange: 1 to 60 s in steps of 1