YASKAWA G7 Series Technical Manual page 12

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Speed Limit (Frequency Reference Limit Function) ................................... 6-30
Limiting Maximum Output Frequency........................................................................... 6-30
Limiting Minimum Frequency ....................................................................................... 6-31
Improved Operating Efficiency ................................................................... 6-32
Reducing Motor Speed Fluctuation (Slip Compensation Function).............................. 6-32
Compensating for Insufficient Torque at Startup and Low-speed Operation
(Torque Compensation)................................................................................................ 6-35
Hunting-prevention Function ........................................................................................ 6-37
Stabilizing Speed (Speed Feedback Detection Function) ............................................ 6-38
Machine Protection .................................................................................... 6-39
Reducing Noise and Leakage Current ......................................................................... 6-39
Limiting Motor Torque (Torque Limit Function) ............................................................ 6-42
Preventing Motor Stalling During Operation ................................................................. 6-44
Changing Stall Prevention Level during Operation Using an Analog Input .................. 6-45
Detecting Motor Torque ................................................................................................ 6-45
Changing Overtorque and Undertorque Detection Levels Using an Analog Input ....... 6-50
Motor Overload Protection ........................................................................................... 6-51
Setting Motor Protection Operation Time ..................................................................... 6-53
Motor Overheating Protection Using PTC Thermistor Inputs ....................................... 6-54
Limiting Motor Rotation Direction ................................................................................. 6-56
Continuing Operation ................................................................................. 6-57
Restarting Automatically After Power Is Restored........................................................ 6-57
Speed Search............................................................................................................... 6-59
Continuing Operation at Constant Speed When Frequency Reference Is Lost ........... 6-65
Restarting Operation After Transient Error (Auto Restart Function) ............................ 6-66
Drive Protection.......................................................................................... 6-67
Performing Overheating Protection on Mounted Braking Resistors ............................. 6-67
Reducing Drive Overheating Pre-Alarm Warning Levels ............................................. 6-68
Input Terminal Functions ............................................................................ 6-69
Temporarily Switching Operation between Digital Operator and Control Circuit
Terminals ...................................................................................................................... 6-69
Blocking Drive Outputs (Baseblock Commands) ......................................................... 6-70
Stopping Acceleration and Deceleration (Acceleration/Deceleration Ramp Hold) ....... 6-71
Raising and Lowering Frequency References Using Contact Signals (UP/DOWN) .... 6-72
Accelerating and Decelerating Constant Frequencies in the Analog References
(+/- Speed) ................................................................................................................... 6-75
Hold Analog Frequency Using User-set Timing ........................................................... 6-76
Switching Operations between a Communications Option Card and Control Circuit
Terminals ...................................................................................................................... 6-76
Jog Frequency Operation without Forward and Reverse Commands (FJOG/RJOG) . 6-77
Stopping the Drive by Notifying Programming Device Errors to the Drive
(External Fault Function) .............................................................................................. 6-78