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Analog Input Filter Time Constant
If noise enters the analog frequency reference during operation using analog frequency reference (b1-01 = 1),
and operation becomes rough, implement noise countermeasures and also set H3-12 (Analog input filter time
parameter) to between 0.01 and 0.10 s.
Confirming Startup Current and Reducing Carrier Frequency
When performing trial operation, check the motor current using the Digital Operator or a clamp ammeter with
and without a mechanical load. An extremely high current will flow if the motor torque at start is insufficient,
or if timing is not correct and the motor locks with the holding brake.
For applications with repetitive loads (cranes, elevators, presses, washing machines, etc.), if a current exceed-
ing 125% of the rated current or more flows repeatedly, the IGBT in the Inverter will be subject to heat stress,
resulting in a shortened life span. In this case, select CT instead of VT and reduce the load, lengthen the accel-
eration/deceleration time, or increase the frame size of the Inverter so that the peak current for repetitive oper-
ation will drop to less than 125% of the rated current. If performing a trial operation with repetitive loads,
make sure that the peak current for repetitive operation is less than 125% of the rated current. If particularly
low noise is not required, do not increase the Inverter's carrier frequency to reduce the influence of heat stress.
Overvoltage Inhibit Function
Leave L3-11 (Overvoltage inhibit function selection) set to 0 (disabled: factory setting). This function is used
to prevent overvoltage tripping when the braking resistor is not used with a regenerative load. When this func-
tion is enabled, the torque reference on the regenerative side is automatically inhibited in the Inverter during
regeneration. Using this function in elevating machines is dangerous because the elevator may slip and fall.
Contact your Yaskawa representative for details on applications such as high-speed elevators (speed: 2 m/s or
higher), direct-drive elevators, or Inverters designed for cranes.
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Troubleshooting
