YASKAWA J1000 Technical Manual page 153

6.8 Troubleshooting without Fault Display
Cause
The frequency reference is too low.
n Motor Stops During Acceleration or When a Load is Connected
Cause
• The load is too heavy.
• The limit of motor response may be reached during
rapid acceleration. This may be a result of improper
stall prevention or automatic torque boost function
adjustment.
n Motor Rotates in One Direction Only
Cause
"Reverse run prohibited" is selected. If b1-04 (Reverse
Prohibit Operation) is set to 1 (reverse run prohibited),
the drive will not accept a reverse run command.
The drive prohibits reverse rotation.
A Reverse run signal has not been entered, although 3-
Wire sequence is selected.
n Peripheral Devices Affected by Drive Operation
Cause
Radio frequency interference may be generated by
drive output PWM waveform.
n Ground Fault Interrupter Activates When Drive is Running
Cause
The output of the drive is a series of high frequency
pulses (PWM), so there is a certain amount of leakage
current. This may cause the ground fault interrupter to
operate and cut off the drive input power.
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• 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.
Increase the acceleration time (C1-01) or reduce the motor load. Also, consider increasing the
motor size and/or drive size.
Set b1-04 = "0" to allow reverse run operation.
• Check parameter b1-04.
• Set the drive to allow the motor to rotate in reverse (b1-04 = "0").
• Make sure that one of the input terminals S3 to S5 used for the 3-Wire sequence has been set
for reverse.
• Change the Carrier Frequency Selection (C6-02) to lower the carrier frequency. This will help
to reduce the amount of transistor switching noise.
• Install an Input Noise Filter at the input power terminals.
• Install an Output Noise Filter at the motor terminals.
• Use conduit. Metal can shield electrical noise.
• Ground the drive and motor.
• Separate main circuit wiring from control wiring.
• Change to a ground fault interrupter with a higher leakage current detection level (such as, a
sensitivity current of 200 mA or greater per Unit, with an operating time of 0.1 s or more), or
one that incorporates high-frequency corrective actions.
• Change the Carrier Frequency Selection (C6-02) to lower the carrier frequency.
Note: Leakage current increases in proportion to cable length.
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
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Possible Solutions
Possible Solution
Possible Solutions
Possible Solutions
Possible Solutions