6 -74 Continuing Operation at Constant Speed When Frequency Reference IsLostThe frequency reference loss detection function continues operation using 80% speed of the frequency refer-ence before loss when the frequency reference using an analog input is reduced 90% or more in 400 ms.When the error signal during frequency reference loss is output externally, set H2-01 to H2-03 (multi-functioncontact output terminal M1-M2, P1-PC, and P2-PC function selection) to C (frequency reference lost).Related Constants Restarting Operation After Transient Fault (Auto Restart Function)If an Inverter fault occurs during operation, the Inverter will perform self-diagnosis. If no fault is detected, theInverter will automatically restart. This is called the auto restart function.Set the number of auto restarts in constant L5-01. A fault reset is attempted every 5 ms after a fault occurs andminimum baseblock time has passed. The number of auto restarts is counted when the Inverter attempts a faultreset and restarts operation. The protection function will operate if a fault continues to occur after auto restart-ing the number of times set in L5-01.The auto restart function can be applied to the following faults. If a fault not listed below occurs, the protec-tion function will operate and the auto restart function will not.* When L2-01 is set to 1 or 2 (continue operation during momentary power loss)Auto Restart External OutputsTo output auto restart signals externally, set H2-01 to H2-03 (multi-function contact output terminals M1-M2,P1-PC, and P2-PC function selection) to 1E (auto restart).Con-stantNumberName Description SettingRangeFactorySettingChangeduringOpera-tionControl Methods MEMOBUSRegis-terV/fV/fwithPGOpenLoopVec-torFluxVec-torL4-05Operationwhen fre-quency refer-ence ismissing0: Stop (Operation follows thefrequency reference.)1: Operation at 80% speedcontinues. (At 80% of speedbefore the frequencyreference was lost)Frequency reference is lost: Fre-quency reference dropped over90% in 400 ms.0 or 1 0 No A A A A 49DH• OC (Overcurrent) • RH (Braking resistor overheated)• GF (Ground fault) • RR (Braking transistor error)• PUF (Fuse blown) • OL1 (Motor overload)• OV (Main circuit overvoltage) • OL2 (Inverter overload)• UV1 (Main Circuit Undervoltage, Main Circuit MC Operation Failure)* • OH1 (Motor overheat)• PF (Main circuit voltage fault) • OL3 (Overtorque)• LF (Output phase failure) • OL4 (Overtorque)
