Telemecanique Altivar 56 manual - Northern Industrial

Bulletin No. 50006-519-01BChapter 5 — ConfigurationDecember 1996 7 →General Configuration MenuCAUTIONMOTOR OVERHEATINGRepeated reset of the thermal state after a thermal overload can result in thermal stressto the motor.When faults occur, promptly inspect motor and driven equipment for problems (lockedshaft, mechanical overload, etc.) prior to restarting. Also check power supplied to motorfor abnormal conditions (phase loss, phase imbalance, etc.).Failure to follow this instruction can result in damage to the motor.When a thermal overload fault occurs, a screen appears which asks “Do you wantto clear the thermal state?” If NO is selected, the motor overload fault cannot bereset until the thermal state of the motor, as calculated by the motor overloadalgorithm in the drive controller, is less than 100%.If YES is selected, the motor overload fault is restrained. The motor overload faultcan be reset and the drive controller restarted. The restraint of the motor overloadtrip will last for approximately one minute. At the end of one minute, the restraintwill clear and a motor overload trip will occur. This function can be used to allowmaintenance personnel to perform an orderly shut-down of a process in the eventof a motor overload fault. Subsequent restraint is possible, if required. However,repeated use of the restraint function can ultimately lead to motor damage.Input Phase FailureInput Phase Failure is used to detect loss of one or all input phases. When set toYes, if one input phase is lost, the drive controller will trip. If the phase is restoredand the drive controller is in 2-wire command with the Run Enable and directioninputs high, the drive controller will automatically restart the motor, regardless ofthe setting of Automatic Restart. If the phase is restored and the drive controller isin 3-wire command, the drive controller will be reset, but the motor will not start.If more than one phase is lost, the drive will trip on undervoltage.Input phase failure can be inhibited by selecting No when a line contactor is usedwith the drive controller and control power is supplied separately to CL1-CL2, orin special applications when a common DC bus tie is used. When set to No, inputphase loss will be ignored, however undervoltage will be displayed if the DC busvoltage is less than the undervoltage level but sufficient to maintain the drivecontroller power supply. The Fault State relay R1 will remain energized whenevervoltage is present on CL1 and CL2, as long as there are no other faults. Theundervoltage condition must be cleared prior to the drive controller recognizing arun command.Loss of FollowerLOSS FOLLOWERNoGo to:####HzFaultLoss of follower is used with the AI2 input and occurs when the 4-20 mA or 20-4mA reference input is less than 3 mA. The drive controller can be programmed tofault, to run at a preset speed (programmable from Low Speed to High Speed), orto ignore the fault condition (factory preset) when loss of follower is detected.When “Go to ### Hz” is selected, AI2 must be the only assigned speed reference.All other speed references must be de-selected (see “Speed Reference” on page 79).The adjustment range of “Go to ### Hz” is 0.1 to 72 Hz.© 1996 Square D All Rights Reserved107ηττπ://νιχοντρολσ.χοm