Troubleshooting
6
6.10 Troubleshooting Without Fault Display
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 393
◆ The Drive Frequency Reference Is Different than the Controller Frequency
Reference Command
Causes Possible Solutions
The analog input gain and bias for the frequency reference
input are set incorrectly.
Examine the gain and bias settings for the analog inputs that set the
frequency reference.
• Terminal A1: H3-03 [Terminal A1 Gain Setting], H3-04 [Terminal A1
Bias Setting]
• Terminal A2: H3-11 [Terminal A2 Gain Setting], H3-12 [Terminal A2
Bias Setting]
• Terminal A3: H3-07 [Terminal A3 Gain Setting], H3-08 [Terminal A3
Bias Setting]
The drive is receiving frequency bias signals from analog
input terminals A1 to A3 and the sum of all signals makes
the frequency reference.
• Examine parameters H3-02, H3-10, H3-06 [MFAI Function Select]. If
two or more of these parameters are set to 0, change the settings.
• Use U1-13 to U1-15 [Terminal A1, A2, A3 Input Voltage] to make sure
that the analog input values set to terminals A1, A2, and A3 are
applicable.
Examine the gain and bias settings for the analog inputs
that set the frequency reference.
Reduce the value set in n4-70 [Speed Command Comp @ Low Freq].
PID control is enabled. If PID control is not necessary, set b5-01 = 0 [PID Mode Setting =
Disabled].
Note:
When PID control is enabled, the drive adjusts the output frequency as
specified by the target value. The drive will only accelerate to the
maximum output frequency set in E1-04 [Maximum Output Frequency]
while PID control is active.
◆ The Motor Speed Is Not Stable When Using a PM Motor
Causes Possible Solutions
E5-01 [PM Motor Code Selection] is set incorrectly. Refer to “Motor Performance Fine-Tuning” in the technical manual.
The drive is operating the motor at more than the specified
speed control range.
Examine the speed control range and adjust the speed.
The motor is operating at a speed reference of 5% or lower. Use a different drive to operate a motor at a speed reference of 5% or lower.
Contact Yaskawa or your nearest sales representative.
The motor is hunting. Adjust these parameters to have the largest effect:
• n8-55 [Motor to Load Inertia Ratio]
• n8-45 [Speed Feedback Detection Gain]
• C4-02 [Torque Compensation Delay Time]
Hunting occurs at start. Increase the value set in C2-01 [S-Curve Time @ Start of Accel].
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.
Speed response is too slow. Increases the setting value of n8-11 [Observer Calculation Gain 2] in 10-
unit increments.
◆ 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 hunting prevention function is disabled. • Set n1-01 = 1 [Hunting Prevention Selection = Enabled].
• Increase the value of n2-01 [SpdFeedbackDetectCtr (AFR) Gain] or n2-
02 [SpdFeedbackDetCtr(AFR)TimeConst1].
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