YASKAWA Varispeed F7 Instruction Manual page 14

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Adjusting 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 ........................................... 6-40
Speed Limit (Frequency Reference Limit Function) ................................... 6-41
Limiting Maximum Output Frequency........................................................................... 6-41
Limiting Minimum Frequency ....................................................................................... 6-41
Improved 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) ............................................ 6-48
Machine 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 ................................................................................. 6-65
Continuing 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)............................. 6-74
Inverter Protection...................................................................................... 6-76
Performing Overheating Protection on Mounted Braking Resistors ............................. 6-76
Reducing Inverter Overheating Pre-Alarm Warning Levels ......................................... 6-77
Input Terminal Functions ............................................................................ 6-78
Temporarily Switching Operation between Digital Operator and Control Circuit
Terminals ...................................................................................................................... 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 Circuit
Terminals ...................................................................................................................... 6-85
Jog Frequency Operation without Forward and Reverse Commands (FJOG/RJOG) . 6-86