Fault - YASKAWA GA700 Technical Manual

6.4

Fault

This section explains the causes and possible solutions when a fault occurs. The drive will remain inoperable until
the fault is cleared using the Fault Reset operation. Remove the cause of the fault referring to the following table.
Code Name
boL BrakingTransistor Overload

Fault

Note:
Perform Fault Reset to clear the fault.
Code Name
bUS Option Communication
Error
Note:
• Detected if the Run command or frequency reference is assigned to the option card.
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in F6-01 [Communication Error Selection].
Code Name
CE MEMOBUS/Modbus
Communication Err
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
The duty cycle of the braking transistor
is high (the regeneration power or
repetition frequency is high).
The braking transistor protective
function is enabled when a regenerative
converter is being used.
The braking transistor in the drive is
broken.
Cause
No signal was received from the
controller.
The communications cable wiring is
incorrect.
There is a short circuit or disconnection
in the communications cable.
Communication data error occurred due
to noise.
The option card is not properly
connected to the drive.
The option card is damaged.
Cause
The communications cable wiring is
incorrect.
There is a short circuit or disconnection
in the communications cable.
Possible Solution
• Install a braking unit (CDBR series).
• Install a regenerative converter.
• Lengthen the deceleration time.
Set L8-55 = 0 [InternalBrakingTransistorProtect =
Disable].
Replace the entire drive.
Possible Solution
Correct any wiring errors.
• Repair disconnected cables and short circuits for
proper wiring.
• Replace a faulty communications cable with a
normal one.
• Check the control circuit lines, main circuit
lines, and ground wiring, and minimize the
effects of noise.
• Check whether an electromagnetic contactor is
the noise source, and use Surge Protective
Device 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, and install a noise filter to the input
side of the power supply for communication.
• Minimize the effects of controller noise.
Mount the option card to the drive correctly.
Replace the option card if the error continues to
occur even though the wiring is correct.
Possible Solution
Correct any wiring errors.
• Repair disconnected cables and short circuits for
proper wiring.
• Replace a faulty communications cable with a
normal one.
6.4 Fault
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