YASKAWA GA700 Technical Manual page 297

Code Name
Note:
• Detected if the Run command or frequency reference is assigned to the option card.
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
• If detected, the drive will operate the motor according to the stop method set in F6-01 [Communication Error Selection].
Code Name
CALL Serial Comm Transmission
Error
Note:
• Detected if control data cannot be received from the controller correctly when energizing the drive.
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
Code Name
CE MEMOBUS/Modbus
Communication Err
Note:
• Detected if control data was not received correctly for the CE detection time set to H5-09 [CE Detection Time].
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
• If detected, the drive will operate the motor according to the stop method set in H5-04 [Stopping Method after Com Error].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
The option card is damaged.
Cause
The communications cable wiring is
incorrect.
There is a short circuit or disconnection
in the communications cable.
Programming error occurred on the
controller side.
Communications circuitry is damaged.
Termination resistor setting for
MEMOBUS/Modbus communications
is incorrect.
Cause
The communications cable wiring is
incorrect.
There is a short circuit or disconnection
in the communications cable.
Communication data error occurred due
to noise.
Communication protocol is
incompatible.
The time set in H5-09 is too short for
the communications cycle.
Something in the controller software or
hardware is causing a communication
problem.
6.5 Minor Faults/Alarms
Possible Solution
If the alarm continues even after wiring has been
corrected, replace the option card.
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 communications at start-up and correct
programming errors.
• Perform a self-diagnostics check.
• If the problem continues, replace either the
control board or the entire drive. For instructions
on replacing the control board, contact Yaskawa
or your nearest sales representative.
Enable the termination resistor in the last drive in a
MEMOBUS/Modbus network by setting DIP
switch S2 to the ON position.
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.
• Check the values set in H5-xx.
• Check the settings on the controller side and
correct the difference in communication
conditions.
• Change the controller software settings.
• Lengthen the time set in H5-09.
Check the controller and remove the cause of the
error.
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