Troubleshooting
7
7.5 Minor Faults/Alarms
YASKAWA SIEPC71061753C GA500 Technical Manual 277
7.5 Minor Faults/Alarms
This section gives information about the causes and possible solutions when a minor fault or alarm occurs. Use
the information in this table to remove the cause of the minor fault or alarm.
Code Name Causes Possible Solutions
AEr Station Address Setting Error
The node address for the communication option is
not in the permitted setting range.
• For CC-Link communication, set F6-10 [CC-Link Node
Address] correctly.
• For MECHATROLINK communication, set F6-20
[MECHATROLINK Station Address] correctly.
• For CANopen communication, set F6-35 [CANopen Node ID
Selection] correctly.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
bAT Keypad Battery Low Voltage
The keypad battery voltage is low. Replace the keypad battery.
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• Parameter o4-24 [bAT Detection Selection] enables and disables bAT detection.
Code Name Causes Possible Solutions
bb Baseblock
An external baseblock command was entered
through MFDI terminal S1 to S7, and the drive
output stopped as shown by an external baseblock
command.
Examine the external sequence and timing of the baseblock
command input.
Note:
The drive will not output a minor fault signal for this alarm.
Code Name Causes Possible Solutions
bCE Bluetooth Communication Error
The smartphone or tablet with DriveWizard Mobile
installed is too far from the keypad.
Use the smartphone or tablet 10 m (32.8 ft) or nearer to the
keypad.
Note:
bCE can occur when the smartphone or tablet is 10 m or
nearer to the keypad depending on the specifications of the
smartphone or tablet.
Radio waves from a different device are causing
interference with the communication between the
smartphone or tablet and keypad.
Make sure that no device around the keypad uses the same radio
bandwidth (2400 MHz to 2480 MHz), and prevent radio
interference.
Note:
• The drive detects this error when you operate the drive with a smartphone or tablet with a Bluetooth LCD Keypad.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will activate.
• Parameter o2-27 [bCE Detection selection] enables and disables bCE detection.
Code Name Causes Possible Solutions
boL Braking Transistor Overload
The duty cycle of the braking transistor is high (the
regeneration power or repetition frequency is high).
• Install a regenerative converter.
• Increase the deceleration time.
You enabled the protective function for the braking
transistor when you have a regenerative converter.
Set L8-55 = 0 [Internal DB TransistorProtection Selection =
Disable].
The braking transistor in the drive is broken. Replace the drive.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
bUS Option Communication Error
The communications cable wiring is incorrect. Correct wiring errors.
There is a short-circuit in the communications cable
or the communications cable is not connected.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
Electrical interference caused a communication data
error.
• Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
• Use only the recommended cables or other shielded line.
Ground the shield on the controller side or the drive input
power side.
• Separate the communication wiring from drive power lines,
and install a noise filter to the input side of the power supply
for communication.
• Decrease the effects of electrical interference from the
controller.
The option card is incorrectly installed to the drive. Correctly install the option card to the drive.
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