Yaskawa Z1000U - Manual (Page 220)

5.10 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 186 for guidance on troubleshooting.
• Motor hunting and oscillation
• Poor motor torque
• Poor speed precision
• Poor motor torque and speed response
• Motor noise
u Common Problems
Common Problems Page
Cannot Change Parameter Settings 220
Motor Does Not Rotate Properly after Pressing RUN Button or after
Entering External Run Command
Motor Does Not Rotate 221
Motor Rotates in the Opposite Direction from the Run Command 222
Motor Rotates in One Direction Only 222
Motor is Too Hot 222
Drive Does Not Allow Selection of Rotational Auto-Tuning 223
oPE02 Error Occurs When Lowering the Motor Rated Current Setting 223
Motor Stalls During Acceleration or With Large Loads 223
Drive Frequency Reference Differs from the Controller Frequency Reference Command 224
Excessive Motor Oscillation and Erratic Rotation 224
Noise From Drive or Motor Cables When the Drive is Powered On 225
Ground Fault Circuit Interrupter (GFCI) Trips During Run 225
Connected Machinery Vibrates When Motor Rotates
Unexpected Noise from Connected Machinery 225
Oscillation or Hunting 225
PID Output Fault 226
Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking) 226
Output Frequency is not as High as Frequency Reference 226
Buzzing Sound from Motor at 2 kHz 226
Unstable Motor Speed when Using PM or IPM 226
Motor Does Not Restart after Power Loss 227
The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals (Terminals DM+ and DM-) 227
u Cannot Change Parameter Settings
Cause Possible Solutions
The drive is running the motor
(i.e., the Run command is present).
• Stop the drive and switch over to the Programming Mode.
• Most parameters cannot be edited during run.
The Access Level is set to restrict access to parameter
settings.
• Set the Access Level to allow parameters to be edited (A1-01 = 2).
The operator is not in the Parameter Setup Mode
(the screen will display “PAr”).
• 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, Programming, and Clock Adjustment Modes on
page 100 .
A multi-function contact input terminal is set to allow
or restrict parameter editing
(H1-01 through H1-08 = 1B).
• When the terminal is open, parameters cannot be edited.
• Turn on the multi-function contact input set to 1B.
5.10 Troubleshooting without Fault Display
220 YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual