YASKAWA varispeed G7 CIMR-G7B series

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