Yaskawa Z1000U - Manual (Page 193)

5.4 Fault Detection
u Fault Displays, Causes, and Possible Solutions
Faults are detected for drive protection, and cause the drive to stop while triggering the fault output terminal MA-MB-MC.
Remove the cause of the fault and manually clear the fault before attempting to run the drive again.
Table 5.10 Detailed Fault Displays, Causes, and Possible Solutions
HOA Keypad Display Fault Name
Aov
Power Supply Overvoltage
The input power supply voltage became equal to or higher than the Input Power Supply Overvoltage
Detection Level.
200 V Class: Approximately 277 Vrms
400 V Class: Approximately 630 Vrms
HOA Keypad Display Fault Name
AUv
Power Supply Undervoltage
The input power supply voltage became equal to or lower than the Input Power Supply Undervoltage
Detection Level (L2-21).
200 V Class: Approximately 150 Vrms
400 V Class: Approximately 300 Vrms
HOA Keypad Display Fault Name
bAT HOA Keypad Battery Voltage Low
Cause Possible Solution
The HOA keypad battery is low Replace the HOA keypad battery.
HOA Keypad Display Fault Name
bUS
Option Communication Error
• The connection was lost after establishing initial communication.
• Only detected when the run command frequency reference is assigned to an option card.
Cause Possible Solution
No signal was received from the PLC • Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
Faulty communications wiring or an existing short
circuit
Communication data error occurred due to noise
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge absorbers if
necessary.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or
the drive input power side.
• Separate all communication wiring from drive power lines.
The option card is damaged Replace the option card if there are no problems with the wiring and the error continues to occur.
The option card is not properly connected to the
drive
• The connector pins on the option card do not line up properly with the connector pins on the drive.
• Reinstall the option card.
HOA Keypad Display Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received for the CE detection time set to H5-09.
Cause Possible Solution
Faulty communications wiring or an existing short
circuit
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 193
5
Troubleshooting