Troubleshooting Without Fault Display; The Parameter Settings Will Not Change; The Motor Does Not Rotate After Entering Run Command - Omron Q2A Series Technical Manual

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 in
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
The drive is operating the motor (the drive is in Drive Mode).
Parameter A1-01 = 0 [Access Level = Monitor only].
Parameter H1-xx: MFDI Function Select = 7C [Prg Lock].
An incorrect password was entered in A1-04 [Password Input].
The drive detected Uv [Undervoltage].
◆

The Motor Does Not Rotate After Entering Run Command

Causes
The drive is not in Drive Mode.
The drive stopped, was pushed, and changed the Run command
source to the keypad.
Auto-Tuning completed.
The drive received a fast stop command.
The settings for the source that supplies the Run command are incorrect.
The frequency reference source is set incorrectly.
There is defective wiring in the control circuit terminals.
The settings for voltage input and current input of the master frequency
reference are incorrect.
The selection for the sinking/sourcing mode and the internal/external power
supply is incorrect.
The frequency reference is too low.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual

7.10 Troubleshooting Without Fault Display

Possible Solutions
Stop the drive and change to Programming Mode.
Set A1-01 = 2 [Standard Parameters] or A1-01 = 3 [Expert Parameters].
Turn ON the terminals to which H1-xx = 7C is set, and then change the parameters.
• 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 the password is set, it will not be possible to change these parameters until the password
matches:
• A1-01 [Access Level]
• A1-02 [Control Method]
• A1-03 [Init Parameters]
• A1-06 [Macro Preset]
• A1-07 [Q2pack Enable]
• A2-01 to A2-32 [MAN1 Param1 to MAN3 Param12]
• View U1-07 [DC Bus Voltage] to see the power supply voltage.
• Examine the main circuit wiring.
Possible Solutions
1. Make sure that the keypad shows [Rdy].
2. If the keypad does not show [Rdy], go back to the Home screen.
Do one of these two:
• Push .
• Re-energize the drive.
Note:
Set o2-01 = 0 [LO/RE Key Selection of Function = Disabled] to prevent changing the Run
command source with .
Go back to the Home screen on the keypad.
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.
Turn off the fast stop input signal.
Set b1-02 [Run Comm. Sel 1] correctly.
Set b1-01 [Freq. Ref. Sel. 1] correctly.
• Correctly wire the drive control circuit terminals.
• View U1-10 [In Terminal Status] for input terminal status.
Examine these analog input terminal signal level settings:
• Terminal AI1: DIP switch S1-1 and H3-01 [AI1 Signal Level Select]
• Terminal AI2: DIP switch S1-2 and H3-09 [AI2 Signal Level Select]
• Terminal AI3: DIP switch S4, S1-3 and H3-05 [AI3 Signal Level Select]
• For sinking mode, close the circuit between terminals DIC-D24V with a wire jumper.
• For sourcing mode, close the circuit between terminals DIC-DI0V with a wire jumper.
• For external power supply, remove the wire jumper.
• View U1-01 [Frequency Reference].
• Increase the frequency reference to a value higher than E1-09 [Min Output Frequency].
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