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YASKAWA A1000 Series Technical Manual

YASKAWA A1000 Series
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6.10 Troubleshooting without Fault Display
340 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Noise From Drive or Output Lines When the Drive is Powered On
Earth Leakage Circuit Breaker (ELCB) Trips During Run
Connected Machinery Vibrates When Motor Rotates
Unexpected Noise from Connected Machinery
Note: The drive may have trouble assessing the status of the load due to white noise generated from using Swing PWM (C6-02 = 7 to A).
Oscillation or Hunting
PID Output Fault
Insufficient Starting Torque
Cause Possible Solutions
Relay switching in the drive generates
excessive noise.
Lower the carrier frequency (C6-02).
Install a noise filter on the input side of drive input power.
Install a noise filter on the output side of the drive.
Place the wiring inside a metal conduit to shield it from switching noise.
Ground the drive and motor properly.
Separate the main circuit wiring and the control lines.
Make sure wires and the motor have been properly grounded.
Cause Possible Solutions
Excessive leakage current trips ELCB.
Increase the ELCB sensitivity or use ELCB with a higher threshold.
Lower the carrier frequency (C6-02).
Reduce the length of the cable used between the drive and the motor.
Install a noise filter or reactor on the output side of the drive. Set the carrier frequency to 2 kHz when connecting a reactor.
Cause Possible Solutions
The carrier frequency is at the resonant frequency of the connected
machinery.
Adjust the carrier frequency using parameters C6-02 through C6-05.
The drive output frequency is the same as the resonant frequency
of the connected machinery.
Adjust the parameters used for the Jump frequency function (d3-01 through d3-04) to skip the problem-causing
bandwidth.
Place the motor on a rubber pad to reduce vibration.
Cause Possible Solutions
Insufficient tuning.
Perform Auto-Tuning.
Refer to Motor Performance Fine-Tuning on page 296.
Gain is too low when using PID control. Refer to b5: PID Control on page 152 for details.
The frequency reference is assigned to an external source and the
signal is noisy.
Ensure that noise is not affecting the signal lines.
Separate main circuit wiring and control circuit wiring.
Use twisted-pair cables or shielded wiring for the control circuit.
Increase the analog input time filter constant (H3-13).
The cable between the drive and motor is too long.
Perform Auto-Tuning.
Reduce the length of the cable.
Cause Possible Solutions
No PID feedback input.
Check the multi-function analog input terminal settings.
Set multi-function analog input terminal A1, A2, or A3 for PID feedback (H3-02, H3-10, or H3-06 = “B”).
A signal input to the terminal selection for PID feedback is needed.
Check the connection of the feedback signal.
Check the various PID-related parameter settings.
No PID feedback input to the terminal causes the value detected to be 0, causing a PID fault and the drive to operate
at max frequency.
The level of detection and the target value do not correspond with
each other.
PID control keeps the difference between target and detection values at 0. Set the input level for the values relative to
one another.
Use analog input gains H3-03 and H3-11 to adjust PID target and feedback signal scaling.
Reverse drive output frequency and speed detection. When output
frequency rises, the sensor detects a speed decrease.
Set PID output for reverse characteristics (b5-09 = 1).
Adjustment made to PID parameter settings are insufficient. Refer to b5: PID Control on page 152 for details.
Cause Possible Solutions
Auto-Tuning has not yet been performed (required for vector
control modes).
Perform Auto-Tuning. Refer to Motor Performance Fine-Tuning on page 296.
The control mode was changed after performing Auto-Tuning. Perform Auto-Tuning again.
Only Stationary Auto-Tuning was performed. Perform Rotational Auto-Tuning.

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YASKAWA A1000 Series Specifications

General IconGeneral
SeriesA1000
TypeAC Drive
AltitudeUp to 1000m without derating
Output Frequency0-400 Hz
Control MethodV/f Control
Overload Capacity150% for 60 seconds
Communication OptionsModbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature-10 to 50°C
Storage Temperature-20 to 60°C
Humidity5% to 95% (non-condensing)
Enclosure RatingIP20
Horsepower0.5 to 1000 HP
Power Range0.4 - 630 kW (varies by voltage and model)
Protection FeaturesOvercurrent, Overvoltage, Undervoltage, Overheat
Cooling MethodFan Cooled
SafetySafe Torque Off (STO)

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