xiii
îš‹ Preventing Overvoltage by Automatically Reducing the Regenerative Torque Limit
(Overvoltage Inhibit Function, PRG: 102 only) ..........................................................6-26
Adjusting Frequency References ...............................................................6-28
îš‹
Adjusting Analog Frequency References .....................................................................6-28
îš‹ Operation Avoiding Resonance (Jump Frequency Function) .......................................6-31
îš‹ Adjusting Frequency Reference Using Pulse Train Inputs ...........................................6-33
Speed Limit (Frequency Reference Limit Function) ...................................6-34
îš‹
Limiting Maximum Output Frequency ...........................................................................6-34
îš‹ Limiting Minimum Frequency........................................................................................6-34
Improved Operating Efficiency ...................................................................6-36
îš‹
Reducing Motor Speed Fluctuation (Slip Compensation Function) ..............................6-36
îš‹ Compensating for Insufficient Torque at Startup and Low-speed Operation
(Torque Compensation) ................................................................................................6-38
îš‹ Hunting-prevention Function.........................................................................................6-40
îš‹ Stabilizing Speed (Speed Feedback Detection Function) ............................................6-41
Machine Protection.....................................................................................6-42
îš‹
Reducing Noise and Leakage Current..........................................................................6-42
îš‹ Limiting Motor Torque (Torque Limit Function).............................................................6-46
îš‹ Preventing Motor Stalling During Operation .................................................................6-49
îš‹ Changing Stall Prevention Level during Operation Using an Analog Input ..................6-50
îš‹ Using Frequency Detection: L4-01 to L4-05.................................................................6-50
îš‹ Detecting Motor Torque ................................................................................................6-53
îš‹ Changing Overtorque and Undertorque Detection Levels Using an Analog Input .......6-56
îš‹ Motor Overload Protection............................................................................................6-57
îš‹ Setting Motor Protection Operation Time......................................................................6-59
îš‹ Motor Overheating Protection Using PTC Thermistor Inputs........................................6-60
îš‹ Limiting Motor Rotation Direction..................................................................................6-62
Continuing Operation..................................................................................6-63
îš‹
Restarting Automatically After Power Is Restored........................................................6-63
îš‹ Speed Search ...............................................................................................................6-64
îš‹ Continuing Operation at Constant Speed When Frequency Reference Is Lost............6-71
îš‹ Restarting Operation After Transient Fault (Auto Restart Function).............................6-72
îš‹ Operation Selection After Cooling Fan Fault ................................................................6-73
Inverter Protection ......................................................................................6-74
îš‹
Performing Overheating Protection on Mounted Braking Resistors .............................6-74
îš‹ Reducing Inverter Overheating Pre-Alarm Warning Levels..........................................6-75
Input Terminal Functions ............................................................................6-76
îš‹
Temporarily Switching Operation between Digital Operator and
Control Circuit Terminals...............................................................................................6-76
îš‹ Blocking Inverter Outputs (Baseblock Commands) ......................................................6-77
îš‹ Stopping Acceleration and Deceleration (Acceleration/Deceleration Ramp Hold) .......6-78
îš‹ Raising and Lowering Frequency References Using Contact Signals (UP/DOWN).....6-79
îš‹ Accelerating and Decelerating Constant Frequencies in the Analog References
(+/- Speed)....................................................................................................................6-82
îš‹ Hold Analog Frequency Using User-set Timing............................................................6-83
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