Fault Detection; Fault Detection; Fault Displays, Causes, And Possible Solutions - YASKAWA P1000 Technical Manual

6.4

Fault Detection

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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.
Digital Operator Display
bAT
Cause
The digital operator battery is low
Digital Operator Display
Cause
The wrong braking resistor is installed
Digital Operator Display
Cause
No signal was received from the PLC
Faulty communications wiring or an existing
short circuit
Communication data error occurred due to
noise
The option card is damaged
The option card is not properly connected to
the drive
Digital Operator Display
Cause
Faulty communications wiring or an existing
short circuit
Communication data error occurred due to
noise
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
Table 6.9 Detailed Fault Displays, Causes, and Possible Solutions
bAT Digital Operator Battery Voltage Low
Replace the digital operator battery.
Braking Transistor Overload Fault
boL
The braking transistor reached its overload level.
Select the correct braking resistor.
Option Communication Error
bUS
• The connection was lost after establishing initial communication.
• Only detected when the run command frequency reference is assigned to an option card.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
• 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. Install an EMC noise filter to the drive
power supply input.
Replace the option card if there are no problems with the wiring and the error continues to occur.
• The connector pins on the option card do not line up properly with the connector pins on the drive.
• Reinstall the option card.
MEMOBUS/Modbus Communication Error
CE
Control data was not received for the CE detection time set to H5-09.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or the
drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors if
required.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive
power supply input.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution

6.4 Fault Detection

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