xii
Speed Limit (Frequency Reference Limit Function) ................................... 6-32
Limiting Maximum Output Frequency........................................................................... 6-32
Limiting Minimum Frequency ....................................................................................... 6-32
Improved Operating Efficiency ................................................................... 6-34
Reducing Motor Speed Fluctuation (Slip Compensation Function) .............................. 6-34
Compensating for Insufficient Torque at Startup and Low-speed Operation
(Torque Compensation)................................................................................................ 6-36
Hunting-prevention Function ........................................................................................ 6-38
Stabilizing Speed (Speed Feedback Detection Function) ............................................ 6-39
Machine Protection .................................................................................... 6-40
Reducing Noise and Leakage Current ......................................................................... 6-40
Limiting Motor Torque (Torque Limit Function) ............................................................ 6-44
Preventing Motor Stalling During Operation ................................................................. 6-47
Changing Stall Prevention Level during Operation Using an Analog Input .................. 6-48
Using Frequency Detection: L4-01 to L4-05................................................................. 6-48
Detecting Motor Torque ................................................................................................ 6-51
Changing Overtorque and Undertorque Detection Levels Using an Analog Input ....... 6-54
Motor Overload Protection ........................................................................................... 6-55
Setting Motor Protection Operation Time ..................................................................... 6-57
Motor Overheating Protection Using PTC Thermistor Inputs ....................................... 6-58
Limiting Motor Rotation Direction ................................................................................. 6-60
Continuing Operation ................................................................................. 6-61
Restarting Automatically After Power Is Restored........................................................ 6-61
Speed Search............................................................................................................... 6-62
Continuing Operation at Constant Speed When Frequency Reference Is Lost ........... 6-69
Restarting Operation After Transient Fault (Auto Restart Function) ............................ 6-70
Inverter Protection...................................................................................... 6-71
Performing Overheating Protection on Mounted Braking Resistors............................. 6-71
Reducing Inverter Overheating Pre-Alarm Warning Levels ......................................... 6-72
Input Terminal Functions ............................................................................ 6-73
Temporarily Switching Operation between Digital Operator
and Control Circuit Terminals ....................................................................................... 6-73
Blocking Inverter Outputs (Baseblock Commands)...................................................... 6-74
Stopping Acceleration and Deceleration (Acceleration/Deceleration Ramp Hold) ....... 6-75
Raising and Lowering Frequency References Using Contact Signals (UP/DOWN) .... 6-76
Accelerating and Decelerating Constant Frequencies in the Analog References
(+/- Speed) ................................................................................................................... 6-79
Hold Analog Frequency Using User-set Timing ........................................................... 6-80
Switching Operations between a Communications Option Board and Control Circuit
Terminals ...................................................................................................................... 6-80
Jog Frequency Operation without Forward and Reverse Commands (FJOG/RJOG) . 6-81
Stopping the Inverter by Notifying Programming Device Errors to the Inverter
(External Fault Function) .............................................................................................. 6-82
Output Terminal Functions ......................................................................... 6-83
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