Yaskawa G5HHP Drive - Manual (Page 323)

9.2 Troubleshooting
9 - 13
J
Autotuning not performed during vector control.
D
Vector control is not effective without autotuning. Perform autotuning for motor unit separately, or set
control method selection (A1--02) to V/f control.
9.2.10 If There is Noise When the Inverter is Started or From an AM Radio
D
If noise is generated by Inverter switching, implement the following countermeasures:
•
Install an Input Noise Filter at the Inverter’s power supply input area.
•
Install an Output Noise Filter at the Inverter’s power supply output area.
•
Use metal tubing. Electric waves can be shielded by metal, so encase the Inverter with metal (steel).
•
Ground the Inverter and motor.
•
Separate main circuit wiring from control wiring.
9.2.11 If the Ground Fault Interrupter Operates When the Inverter is Run
D
The Inverter performs internal switching, so there is a certain amount of leakage current. This may cause
the ground fault interrupter to operate and cut off the power supply. Change to a ground fault interrupter
with a high leakage detection level (i.e., a sensitivity current of 200 mA or greater per Unit, with an operat-
ing time of 0.1 s or more), or one that incorporates high frequency countermeasures (i.e., one designed for
use with Inverters).
In addition, remember that the leakage current increases as the cable is lengthened.
9.2.12 If There is Mechanical Oscillation
J
The machinery is making unusual sounds.
1. There may be resonance between the mechanical system’s characteristic frequency and the
carrier frequency.
D
If the motor is running with no problems and the machinery is oscillating with a high-pitched whine, it
may indicate that this is occurring. Use the jump frequency functions in constants d3-01 to d3-04 to reduce
oscillation.
2. There may be resonance between a machine’s characteristic frequency and the output fre-
quency of the Inverter.
D
To prevent this from occurring, either use the jump frequency functions in constants d3-01 to d3-04 or
install rubber padding on the motor base to reduce oscillation.
J
Oscillation and hunting are occurring with open-loop vector control.
D
The gain adjustment may be insufficient. Reset the gain to a more effective level by adjusting constants
C4-02 (torque compensation time constant), C8-08 (AFR gain), and C3-02 (slip compensation primary
delay time) in order. Lower the gain setting and raise the primary delay time setting.
D
Vector control is not effective without autotuning. Perform autotuning for motor unit separately or set the
motor constants obtained from calculations.
J
Oscillation and hunting are occurring with V/f control.
D
The gain adjustment may be insufficient. Reset the gain to a more effective level by adjusting constants
C4-02 (torque compensation time constant), C7-02 (hunting prevention gain), and C3-02 (slip compensa-
tion primary delay time) in order. Lower the gain setting and raise the primary delay time setting.
J
Oscillation and hunting are occurring with flux vector control.
D
The gain adjustment may be insufficient. Adjust the various types of speed control loop (ASR) gain. (For
details, refer to page 6 - 36.)
D
If the mechanical system’s resonance point coincides with the Inverter’s operating frequency and the os-
cillation cannot be eliminated in this way, increase the ASR primary delay time (constant C5-06) and then
try adjusting the gain again.
D
Vector control is not effective without autotuning. Perform autotuning for motor unit separately or set the
motor constants obtained from calculations.
J
Oscillation and hunting are occurring with V/f w/PG control.
D
The gain adjustment may be insufficient. Adjust the various types of speed control loop (ASR) gain. (For
details, refer to page 6 - 44.)
D
If the oscillation cannot be eliminated in this way, set the hunting prevention selection (constant C7-01)
to “0” (disabled) and then try adjusting the gain again.
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