Troubleshooting Without Fault Display; Troubleshooting Without Fault Display; Common Problems; Cannot Change Parameter Settings - YASKAWA T1000A Technical Manual

6.10 Troubleshooting without Fault Display

This section describes troubleshooting problems that do not trip an alarm or fault.
The following symptoms indicate that the drive is not set correctly for proper performance with the motor. Refer to
Motor Performance Fine-Tuning on page 268
• Motor hunting and oscillation
• Poor motor torque
• Poor speed precision
• Poor motor torque and speed response
• Motor noise
u Common Problems

Cannot Change Parameter Settings

Motor Does Not Rotate Properly after Pressing RUN Button or after Entering
External Run Command
Motor is Too Hot
Drive Does Not Allow Selection of Rotational Auto-Tuning
oPE02 Error Occurs When Lowering the Motor Rated Current Setting
Motor Stalls During Acceleration or With Large Loads
Drive Frequency Reference Differs from the Controller Frequency Reference Command
Excessive Motor Oscillation and Erratic Rotation
Deceleration Takes Longer Than Expected with Dynamic Braking Enabled
Load Falls When Brake is Applied (Hoist-Type Applications)
Noise From Drive or Output Lines When the Drive is Powered On
Ground Fault Circuit Interrupter (GFCI) Trips During Run
Connected Machinery Vibrates When Motor Rotates
PID Output Fault
Insufficient Starting Torque
Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking)
Output Frequency is not as High as Frequency Reference
Buzzing Sound from Motor at 2 kHz
Unstable Motor Speed when Using PM or IPM
Motor Does Not Restart after Power Loss
u Cannot Change Parameter Settings
Cause
The drive is running the motor (i.e., the Run command is present).
The Access Level is set to restrict access to parameter settings.
The operator is not in the Parameter Setup Mode (the screen will
display "PAr").
A multi-function contact input terminal is set to allow or restrict
parameter editing (H1-01 through H1-08 = 1B).
The wrong password was entered.
Undervoltage was detected.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual

6.10 Troubleshooting without Fault Display

for guidance on troubleshooting.

Common Problems

Motor Does Not Rotate
Motor Rotates in the Opposite Direction from the Run Command
Motor Rotates in One Direction Only
Unexpected Noise from Connected Machinery
Oscillation or Hunting
• Stop the drive and switch over to the Programming Mode.
• Most parameters cannot be edited during run.
• Set the Access Level to allow parameters to be edited (A1-01 = 2).
• See what mode the operator is currently set for.
• Parameters cannot be edited when in the Setup Mode ("STUP"). Switch modes so that "PAr" appears on the screen.
Refer to The Drive and Programming Modes on page 77.
• When the terminal is open, parameters cannot be edited.
• Turn on the multi-function contact input set to 1B.
• If the password entered to A1-04 does not match the password saved to A1-05, then drive settings cannot be
changed.
• Reset the password.
If you cannot remember the password:
STOP
• Scroll to A1-04. Press the
• Set a new password to parameter A1-05.
• Check the drive input power voltage by looking at the DC bus voltage (U1-07).
• Check all main circuit wiring.
Possible Solutions
button and press at the same time. Parameter A1-05 will appear.
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