7.10 Troubleshooting Without Fault Display
302 YASKAWA SIEPC71061753C GA500 Technical Manual
Causes Possible Solutions
Too much current is flowing through the drive. Set E5-01 [PM Motor Code Selection] correctly as specified by the motor. For special-purpose
motors, enter the correct value to E5-xx as specified by the motor test report.
Operation is not stable when n8-57 = 1 [HFI Overlap Selection = Enabled]. • Do High Frequency Injection Auto-Tuning.
• Decrease the value set in n8-41 [HFI P Gain] in increments of 0.5.
Note:
Set n8-41 > 0.0 for IPM motors.
◆ There Is Too Much Motor Oscillation and the Rotation Is Irregular
Causes Possible Solutions
Unsatisfactory balance of motor phases. • Make sure that the drive input power voltage supplies stable power.
• Set L8-05 = 0 [Input Phase Loss Protect Select = Disabled].
The motor is hunting. • Set n1-01 = 1 [Hunting Prevention Selection = Enabled].
• Increase the value of n2-01 [SpdFeedbackDetectCtr (AFR) Gain] or n2-02
[SpdFeedbackDetCtr(AFR)TimeConst1].
◆ Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
Causes Possible Solutions
The stall prevention during deceleration setting is incorrect. • Examine the setting for L3-04 [Decel Stall Prevention Selection].
• When the drive has a dynamic braking option installed, set L3-04 = 0 [Disabled].
• If the drive detects ov [Overvoltage], set L3-04 = 3 [General Purpose w/ DB resistor].
The deceleration time setting is too long. Set C1-02, C1-04, C1-06, or C1-08 [Deceleration Times] to applicable values.
The motor torque is not sufficient. Use a larger motor.
Note:
If these items are correct, the demand on the motor is more than the motor capacity:
• Parameter settings are correct.
• The drive does not detect ov [Overvoltage].
The drive and motor system reached the torque limit. • Examine the values set in L7-01 to L7-04 [Torque Limit] and increase them if necessary.
Note:
If the torque limit is enabled, deceleration time can increase because the drive cannot output
more torque than the limit.
• If H3-02, H3-10 = 10, 11, 12, 15 [MFAI Function Select = Torque Limit], examine the settings
for the MFAIs.
• Examine the values set in H3-02 and H3-10.
• Use U1-13, U1-14 [Terminal A1, A2 Input Voltage] to make sure that the analog input
values set to terminals A1 and A2 are applicable.
The load is more than the internal torque limit as specified by the drive rated
current.
Replace the drive with a larger capacity model.
◆ The Load Falls When a Brake Is Applied
Causes Possible Solutions
The open/close timing of the brake is incorrect. Refer to “Notes on Controlling the Brake when Using the Hoist Application Preset” in the
technical manual and take appropriate measures.
The DC injection braking is not sufficient. Increase the value set in b2-02 [DC Injection Braking Current].
◆ There Is Audible Noise from the Drive or Motor Cables when You Energize the
Drive
Causes Possible Solutions
The relay switching in the drive is making too much noise. • Use C6-02 [Carrier Frequency Selection] to decrease the carrier frequency.
• Connect a noise filter to the input side of the drive power supply.
• Connect a noise filter to the output side of the drive.
• Isolate the control circuit wiring from the main circuit wiring.
• Use a metal cable gland to wire the drive.
• Shield the periphery of the drive with metal.
• Make sure that the drive and motor are grounded correctly.
• Make sure that ground faults have not occurred in the wiring or motor.
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