Faults - YASKAWA GA700 Technical Manual

6.4

Faults

This section gives information about the causes and possible solutions of faults. You must use the Fault Reset
operation to remove the fault before you can operate the drive. Use the information in this table to remove the
cause of the fault.
Code Name
bAT Keypad Battery Low
Voltage
Note:
Use o4-24 [bAT Detection Selection] to enable/disable bAT detection.
Code Name
bCE Bluetooth Communication
Fault
Note:
• The drive detects this error when operating the drive with a smart device using the Bluetooth LCD keypad.
• Do a Fault Reset to clear the fault.
• Set the stopping method for this fault in o2-27 [bCE Detection Selection].
Code Name
boL BrakingTransistor Overload
Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
bUS Option Communication
Error
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Causes
The keypad battery voltage is low.
Causes
The smart device with DriveWizard
Mobile installed is too far from the
keypad.
Radio waves from a different device are
causing interference with
communications between the smart
device and keypad.
Causes
The duty cycle of the braking transistor
is high (the regeneration power or
repetition frequency is high).
You enabled the protective function for
the braking transistor when you have a
regenerative converter.
The braking transistor in the drive is
broken.
Causes
The drive did not receive a signal from
the controller.
The communications cable wiring is
incorrect.
There is a short circuit or the
communications cable is not connected.
Electrical interference caused a
communication data error.
The option card is incorrectly installed
to the drive.
Possible Solutions
Replace the keypad battery.
Possible Solutions
Use the smart device 10 m (32.8 ft.) or nearer to
the keypad.
Note:
bCE can occur when the smart device is 10 m or
nearer to the keypad depending on the
specifications of the smart device.
Make sure that no device around the keypad uses
the same radio bandwidth (2400 MHz to 2480
MHz), and prevent radio interference.
Possible Solutions
• Install a braking unit (CDBR-series).
• Install a regenerative converter.
• Increase the deceleration time.
Set L8-55 = 0 [Internal DB TransistorProtection =
Disable].
Replace the entire drive.
Possible Solutions
Correct wiring errors.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
• 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.
• Isolate 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.
Correctly install the option card to the drive.

6.4 Faults

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