YASKAWA J1000 Technical Manual page 152

n Oscillation or Hunting
Cause
Insufficient tuning.
The frequency reference is assigned to an external
source and the signal is noisy.
The cable between the drive and motor is too long.
n Motor Rotates After the Drive Output is Shut Off
Cause
Low DC Injection Braking and the drive cannot
decelerate properly.
n ov or Speed Loss Occurs When Starting into a Rotating Load
Cause
The load is already rotating when the drive is trying to
start it.
n Output Frequency is not as High as Frequency Reference
Cause
Frequency reference is set within the range of the Jump
Frequency.
Upper limit for the frequency reference has been
exceeded.
Large load triggered Stall Prevention function during
acceleration.
n Buzzing Sound from Motor at 2 kHz
Cause
Exceeded 110% of the rated output current of the drive
while operating at low speeds.
n
Motor Does Not Operate When the RUN Button on the Digital Operator is Pressed
Cause
The LOCAL/REMOTE mode is not selected properly. Press the LOCAL/REMOTE button to switch. The LO/RE LED should be on for LOCAL mode.
The drive is not in drive mode.
The frequency reference is too low.
n Motor Does Not Operate When an External Run Command is Input
Cause
The LOCAL/REMOTE mode is not selected properly.
The drive is not in Drive Mode.
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
Adjust Hunting prevention Gain Setting (n1-02).
• 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).
• Reduce the length of the cable.
• Adjust the DC Injection braking settings.
• Increase the value of b2-02 (DC Injection Braking Current).
• Increase the b2-04 (DC Injection Braking Time at Stop).
• Stop the motor using DC Injection braking. Restart the motor.
• Increase the value of b2-03 (DC Injection Braking Time at start).
• Set a multi-function input terminal for external Speed Search command (H1-oo="61" or
"62" during restart).
• Adjust the parameters used for the Jump Frequency function (d3-01, d3-02).
• Enabling the Jump Frequency prevents the drive from outputting the frequencies specified in
the Jump Frequency range.
• Set the maximum output frequency and the upper limit for the frequency reference to more
appropriate values (E1-04, d2-01).
• The following calculation yields the upper value for the output frequency = E1-04 x d2-01 /
100
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
• If the output current rises too high at low speeds, the carrier frequency automatically reduces
and causes a whining or buzzing sound.
• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = "0").
• Disabling the automatic carrier frequency derating increases the chances of an overload fault
(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.
A run command will not be issued. Exit to the drive mode and cycle the run command.
• If the frequency reference is set below the frequency set in E1-09 (Minimum Output
Frequency), the drive will not operate.
• Raise the frequency reference to at least the minimum output frequency.
Press the LOCAL/REMOTE button to switch. The LO/RE LED should be off for REMOTE
mode.
A run command will not be issued. Exit to the Drive mode and cycle the run command.
http://nicontrols.com
6.8 Troubleshooting without Fault Display
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
6
151