xivAdjusting Frequency References ............................................................... 6-35 Adjusting Analog Frequency References ..................................................................... 6-35 Operation Avoiding Resonance (Jump Frequency Function)....................................... 6-38 Adjusting Frequency Reference Using Pulse Train Inputs ........................................... 6-40Speed Limit (Frequency Reference Limit Function) ................................... 6-41 Limiting Maximum Output Frequency........................................................................... 6-41 Limiting Minimum Frequency ....................................................................................... 6-41Improved Operating Efficiency ................................................................... 6-43 Reducing Motor Speed Fluctuation (Slip Compensation Function).............................. 6-43 Compensating for Insufficient Torque at Startup and Low-speed Operation(Torque Compensation)................................................................................................ 6-45 Hunting-prevention Function ........................................................................................ 6-47 Stabilizing Speed (Speed Feedback Detection Function) ............................................ 6-48Machine Protection .................................................................................... 6-49 Limiting Motor Torque (Torque Limit Function) ............................................................. 6-49 Preventing Motor Stalling During Operation ................................................................. 6-52 Changing Stall Prevention Level during Operation Using an Analog Input .................. 6-53 Using Frequency Detection .......................................................................................... 6-53 Detecting Motor Torque ................................................................................................ 6-56 Changing Overtorque and Undertorque Detection Levels Using an Analog Input ....... 6-59 Motor Overload Protection ........................................................................................... 6-60 Setting Motor Protection Operation Time ..................................................................... 6-62 Motor Overheating Protection Using PTC Thermistor Inputs ....................................... 6-63 Limiting Motor Rotation Direction ................................................................................. 6-65Continuing Operation ................................................................................. 6-66 Restarting Automatically After Power Is Restored........................................................ 6-66 Speed Search............................................................................................................... 6-67 Continuing Operation at Constant Speed When Frequency Reference Is Lost ........... 6-74 Restarting Operation After Transient Fault (Auto Restart Function)............................. 6-74Inverter Protection...................................................................................... 6-76 Performing Overheating Protection on Mounted Braking Resistors ............................. 6-76 Reducing Inverter Overheating Pre-Alarm Warning Levels ......................................... 6-77Input Terminal Functions ............................................................................ 6-78 Temporarily Switching Operation between Digital Operator and Control CircuitTerminals ...................................................................................................................... 6-78 Blocking Inverter Outputs (Baseblock Commands)...................................................... 6-79 Stopping Acceleration and Deceleration (Acceleration/Deceleration Ramp Hold) ....... 6-80 Raising and Lowering Frequency References Using Contact Signals (UP/DOWN) .... 6-81 Accelerating and Decelerating Constant Frequencies in the Analog References(+/- Speed).................................................................................................................... 6-84 Hold Analog Frequency Using User-set Timing ........................................................... 6-85 Switching Operations between a Communications Option Board and Control CircuitTerminals ...................................................................................................................... 6-85 Jog Frequency Operation without Forward and Reverse Commands (FJOG/RJOG) . 6-86
