Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 266)

6.9 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 230 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 266
Motor Does Not Rotate Properly after Pressing RUN Button or after
Entering External Run Command
Motor Does Not Rotate 267
Motor Rotates in the Opposite Direction from the Run Command 269
Motor Rotates in One Direction Only 269
Motor is Too Hot 269
oPE02 Error Occurs When Lowering the Motor Rated Current Setting 270
Motor Stalls During Acceleration or With Large Loads 270
Drive Frequency Reference Differs from the Controller Frequency Reference Command 270
Excessive Motor Oscillation and Erratic Rotation 271
Noise From Drive or Motor Cables When the Drive is Powered On 271
Ground Fault Circuit Interrupter (GFCI) Trips During Run 271
Connected Machinery Vibrates When Motor Rotates
Unexpected Noise from Connected Machinery 271
Oscillation or Hunting 272
PID Output Fault 272
Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking) 272
Output Frequency is not as High as Frequency Reference 272
Buzzing Sound from Motor at 2 kHz 273
Motor Does Not Restart after Power Loss 273
The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals (Terminals DM+ and DM-) 273
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 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 and Programming Modes on page 118 .
A multi-function contact input terminal is set to allow
or restrict parameter editing
(H1-01 through H1-07 = 1B).
• When the terminal is open, parameters cannot be edited.
• Turn on the multi-function contact input set to 1B.
The wrong password was entered.
• 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:
•
Scroll to Z1-02. Press
OFF
and simultaneously. Parameter Z1-03 will appear.
• Set a new password to parameter Z1-03.
Undervoltage was detected.
• Check the drive input power voltage by looking at the DC bus voltage (U1-07).
• Check all main circuit wiring.
6.9 Troubleshooting without Fault Display
266 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual