Troubleshooting
7
7.10 Troubleshooting Without Fault Display
YASKAWA SIEPYEULA5001C LA500 Technical Manual 197
7.10 Troubleshooting Without Fault Display
If the drive or motor operate incorrectly, but the keypad does not show a fault or error code, refer to the items this
section.
• Motor hunting and oscillation
• Unsatisfactory motor torque
• Unsatisfactory speed precision
• Unsatisfactory motor torque and speed response
• Motor noise
◆ The Parameter Settings Will Not Change
Causes Possible Solutions
The drive is operating the motor (the drive is in Drive Mode). Stop the drive and change to Programming Mode.
Parameter A1-01 = 0 [Access Level Selection = Operation Only]. Set A1-01 = 2 [Access Level Selection = Advanced Level] or A1-01 = 3 [Expert Level].
Parameter H1-xx = 1B [MFDI Function Select = Programming Lockout]. Activate the terminals to which H1-xx = 1B is set, and then change the parameters.
You entered an incorrect password in A1-04 [Password]. • Enter the correct password to A1-04 again.
• If you forgot the password, set the password again with A1-04 and A1-05 [Password Setting].
Note:
If you set the password, you cannot change these parameters until the password aligns:
• A1-01 [Access Level Selection]
• A1-02 [Control Method Selection]
• A1-03 [Initialize Parameters]
• A2-01 to A2-32 [User Parameter 1 to User Parameter 32]
The drive detected Uv [Undervoltage]. • View U1-07 [DC Bus Voltage] to see the power supply voltage.
• Examine the main circuit wiring.
◆ The Motor Does Not Rotate after You Enter a Run Command
Causes Possible Solutions
The drive is not in Drive Mode. 1. Make sure that the READY LED on the keypad is ON.
2. If the READY LED is OFF, push and hold the ESC Key to go back to the frequency
reference screen (the initial screen).
The drive stopped and you pushed to transfer the Run command
source to the keypad.
Do one of these two:
• Push .
• Re-energize the drive.
Note:
When must not change the Run command source, set o2-01 = 0 [LO/RE Key
Function Selection = Disabled].
Auto-Tuning completed. Push and hold the ESC Key to go back to the frequency reference screen (the initial screen).
Note:
When Auto-Tuning completes, the drive changes to Programming Mode. The drive will not
accept a Run command unless the drive is in Drive Mode.
The drive received a Fast Stop command. Turn off the fast stop input signal.
The settings for the source that supplies the Run command are incorrect. Set b1-02 [Run Command Selection 1] correctly.
The frequency reference source is not set correctly. Set b1-01 [Frequency Reference Selection 1] correctly.
There is defective wiring in the control circuit terminals. • Correctly wire the drive control circuit terminals.
• View U1-10 [Input Terminal Status] for input terminal status.
The selection for the sinking/sourcing mode and the internal/external power
supply is incorrect.
• For sinking mode, close the circuit between terminals SC-SP with a wire jumper.
• For sourcing mode, close the circuit between terminals SC-SN with a wire jumper.
• For external power supply, remove the wire jumper.
The frequency reference is too low. • View U1-01 [Freq Reference].
• Increase the frequency reference to a value higher than E1-09 [Minimum Output Frequency].
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