Telemecanique Altivar 56 manual - Northern Industrial

Bulletin No. 50006-519-01BChapter 5 — ConfigurationDecember 1996 7 → General Configuration Menu3. OFF to BYP: SW contact A closes, energizing the B (Bypass) contactor. Motoroverload protection is provided by OL (thermal overload relay) duringrunning in Bypass. SW contact B opens, disabling the I contactor controlcircuit. SW contact D opens. Since LI3 (Sequence Input) goes low as a result,the drive controller cannot start. If the drive controller was still in the processof decelerating the motor when previously in “AS”, the drive controller willinitiate a Sequence Time-out Fault, signalling that an incorrect SW sequencehas occurred. If incorrect SW sequence indication is not desired, theControlled Stop function can be used along with the Bypass function. To useControlled Stop, SW contact D must be connected directly into the LI assignedto Controlled Stop and the I contactor interlock is wired to +24. Use of theControlled Stop function along with the Bypass function requires the additionof an I/O Extension module if a Process Input is used.4. BYP to OFF: SW contact A opens, de-energizing I contactor. The motor stops.Run forward1Run output 0command1Sequence input 0+ ReferenceDT = CEMF Decay TimeSTof = Sequence Time-Out faultPTof = Process Time-Out fault-DT--DT----STof------STof----PTof--PTof-1 Normal Stop2 Freewheel Stop-DT----STof----PTof-Frequency1 12Process input10Normal Sequence Incomplete Process Incomplete SequenceFigure 57: Bypass Timing DiagramASASWOFFBYPIBOLBBIDRIVE CONTROLLERR2AROCR2C+24LI1RUN PERMISSIVECLI2FORWARDDILI3SEQUENCE INPUTLI4PROCESS INPUTContactAS OFF BYPPSIBAXBCDXXXXXPSPumpOLMFigure 58: Bypass Circuit Diagram© 1996 Square D All Rights Reserved87ηττπ://νιχοντρολσ.χοm