Troubleshooting
7
7.10 Troubleshooting Without Fault Display
YASKAWA SIEPC71061753C GA500 Technical Manual 301
Causes Possible Solutions
The load is too large. • Increase the acceleration time.
• Examine the mechanical brake and make sure that it is fully releasing.
• Decrease the load to make sure that the output current stays less than the motor rated current.
• Use a larger motor.
Note:
• In extruder and mixer applications, the load can increase as the temperature decreases.
• Although the drive has a Stall Prevention function and a Torque Compensation Limit
function, if you try to accelerate too fast or try to drive a load that is too large, it can be too
much for the limits of the motor.
The frequency reference is low. • Examine E1-04 [Maximum Output Frequency] and increase the setting if it is set too low.
• Examine U1-01 [Frequency Reference] for the correct frequency reference.
• Examine the multi-function input terminals to see if a frequency reference signal switch is set.
• When you use an MFAI, examine the low gain level set in H3-03, H3-11 [Terminal A1, A2
Gain Setting].
The frequency reference is set incorrectly. When H3-10 = 1 Terminal A2 Function Selection = Frequency Gain], see if the drive is set for
voltage (current).
• Examine the value set in H3-10.
• Use U1-14 [Terminal A2 Input Voltage] to make sure that the analog input value set to
terminal A2 is applicable.
The motor characteristics and drive parameter settings are not compatible. • Set the correct V/f pattern to agree with the characteristics of the motor.
• Examine the V/f pattern set in E1-03 [V/f Pattern Selection].
• Do Rotational Auto-Tuning.
The drive is operating in vector control mode, but you did not complete
Auto-Tuning.
• Do Auto-Tuning.
• Calculate motor data and reset motor parameters.
• Set A1-02 = 0 [Control Method Selection = V/f Control].
The Stall Prevention level during acceleration setting is too low. Increase the value set in L3-02 [Stall Prevent Level during Accel].
Note:
If the L3-02 value is too low, the acceleration time can be unsatisfactorily long.
The Stall Prevention level during run setting is too low. Increase the value set in L3-06 [Stall Prevent Level during Run].
Note:
If the L3-06 value is too low, speed will decrease before the drive outputs torque.
The drive is at the limit of the V/f motor control method. • When the motor cable is longer than 50 m (164 ft), do Auto-Tuning for line-to-line resistance.
• Set the V/f pattern to “High Starting Torque”.
• Use a Vector Control method.
Note:
V/f control method does not supply high torque at low speeds.
◆ 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]
The drive is receiving frequency bias signals from analog input terminals A1
and A2 and the sum of all signals makes the frequency reference.
• Examine parameters H3-02, H3-10 [MFAI Function Select]. If both of these parameters = 0,
change the settings.
• 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.
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 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].
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