118 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
5.4 Fault Detection
5.4 Fault Detection
◆ Fault Displays, Causes, and Possible Solutions
Table 5.12 Detailed Fault Displays, Causes, and Possible Solutions
Digital Operator Display Fault Name
bUS
Option Communication Error
• After establishing initial communication, the connection was lost.
• Only detected when the run command or frequency reference is assigned to an option
card.
Cause Possible Solution
No signal received from the PLC.
Check for faulty wiring.
⇒Correct the wiring.
⇒Check for disconnected cables and short circuits. Repair as needed.
Faulty communications wiring or a short
circuit exists.
A communications data error occurred due to
noise.
Check the various options available to minimize the effects of noise.
⇒Take steps to counteract noise in the control circuit, main circuit, and ground wiring.
⇒If the magnetic contactor is identified as a source of noise, install a surge protector to the
MC coil.
⇒Use only recommended shielded line.
Ground the shield on the controller side or on the
drive input power side.
⇒Separate all wiring for comm. devices from drive input power lines. Install an EMC
noise filter to the drive input power supply.
The option card is damaged.
⇒Replace the option card if there are no problems with the wiring and the error continues
to occur.
The option card is not properly connected to
the drive.
The connector pins on the option card are not properly lined up with the connector pins on
the drive.
⇒Reinstall the option card.
Digital Operator Display Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received for the CE detection time set to H5-09.
Cause Possible Solution
Faulty communications wiring or a short
circuit exists.
Check for faulty wiring.
⇒Correct the wiring.
⇒Check for disconnected cables and short circuits. Repair as needed.
Communication data error occurred due to
noise.
Check the various options available to minimize the effects of noise.
⇒Take steps to counteract noise in the control circuit, main circuit, and ground wiring.
⇒If the magnetic contactor is identified as a source of noise, install a surge protector to the
MC coil.
⇒Use only recommended shielded line. Ground the shield on the controller side or on the
drive input power side.
⇒Separate all wiring for comm. devices from input power lines of the drive. Install an
EMC noise filter to the drive input power supply.
Digital Operator Display Fault Name
CF
Control Fault
A torque limit was reached continuously for three seconds or longer while ramping to stop
in Open Loop Vector Control.
Cause Possible Solution
Motor parameters are not set properly. ⇒Check the motor parameter settings and repeat Auto-Tuning.
Torque limit is set too low. ⇒Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Load inertia is too big.
⇒Adjust the deceleration time (C1-02, -04, -06, -08).
⇒Set the frequency to the minimum value and interrupt the Run command when the drive
finishes decelerating.
The connection between motor and drive is
improper.
Check for faulty wiring.
⇒Correct the wiring.
The line-to-line resistance has not been tuned. Run the Auto-Tuning of line-to-line resistance.
The stopping method setting is not
appropriate.
The Run command fails to decelerate to a stop or is applied to unwanted machine.
The Run command is issued in the coast to
stop state.
⇒The stop command is issued after the motor stopped.
⇒Enable Speed Search at start (b3-01 = 1).
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