Yaskawa G7 Drive - Manual (Page 11)

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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