YASKAWA CIMR-JC4A0002BAA Quick Start Manual page 155

5.8 Troubleshooting without Fault Display
n Deceleration Takes Longer Than Expected when Using a Braking
Resistor
Cause
L3-04 is set incorrectly.
The deceleration time is set too long.
Insufficient motor torque.
Load exceeded the internal torque limit
determined by the drive rated current.
n Motor Hunting Occurs When Operating With a Light Load
Cause
Carrier frequency is too high.
Large V/f setting value at low speeds
triggers overexcitation.
The maximum output frequency and the
base frequency reference are not set
properly in relationship to each other.
Hunting Prevention is set up incorrectly. Adjust the hunting prevention gain (n1-02).
n Noise From Drive or Output Lines When the Drive is Powered On
Cause
Relay switching in the drive generates
excessive noise.
n
Ground Fault Circuit Interrupter (GFCI) Trips During Run
Cause
Excessive leakage current trips MCCB.
154
• Check the Stall Prevention Level during deceleration (L3-04).
• If a braking resistor option has been installed, disable Stall Prevention
during deceleration (L3-04 = "0").
Set deceleration to more appropriate time (C1-02 and C1-04).
• Assuming parameter settings are normal and that no overvoltage occurs
when there is insufficient torque, it is likely that the demand on the motor
has exceeded the motor capacity.
• Use a larger motor.
Switch to a larger capacity drive.
Lower the carrier frequency setting C6-02.
• Use parameters E1-04 through E1-10 to set the V/f pattern in relation to
the load characteristics.
Set the proper values for the maximum output frequency and base frequency
(E1-04, E1-06).
• 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.
• Increase the GFCI sensitivity or use GFCI 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.
YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
http://nicontrols.com
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions