Fault Detection; Fault Detection; Fault Displays, Causes, And Possible Solutions - YASKAWA V1000 Technical Manual

6.4

Fault Detection

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Fault Displays, Causes, and Possible Solutions

LED Operator Display
Cause
No signal received from the PLC.
The communication cable is faulty or a short
circuit exists.
A communications data error occurred due to
noise.
The option card is damaged.
The option card is not properly connected to
the drive.
LED Operator Display
Cause
Faulty communications wiring, or a short
circuit exists.
A communications data error occurred due to
noise.
LED Operator Display
Cause
Motor parameters are not set properly.
Torque limit is too low.
Load inertia is too big.
LED Operator Display
Cause
Due to residual induction current in the
motor when the drive attempted to start the
motor, the drive attempted to adjust the
current offset value beyond the allowable
range.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Table 6.9 Detailed Fault Displays, Causes, and Possible Solutions
Option Communication Error
bUS
• After establishing initial communication, the connection was lost.
• Only detected when the run command frequency reference is assigned to an option card.
• Check for faulty wiring.
• Correct the wiring.
• Check for loose wiring and short circuits. Repair as needed.
• Check the various options available to minimize the effects of noise.
• Counteract noise in control circuit, main circuit, and ground wiring.
• Ensure that other equipment such as switches or relays do not cause noise and use surge suppressors
if required.
• Use cables recommended by Yaskawa or another type of shielded line. Ground the shield on the
controller side or on the drive input power side.
• Separate all wiring for communications devices from drive input power lines. Install an EMC noise
filter to the input side of the drive input power.
• Replace the option card if there are no problems with the wiring and the error continues to occur.
• The connector pins on the option card are not properly lined up with the connector pins on the drive.
• Reinstall the option card.
MEMOBUS/Modbus Communication Error
CE
Control data was not received for the CE detection time set to H5-09.
• Check for faulty wiring.
• Correct the wiring.
• Check for loose wiring and short circuits. Repair as needed.
• Check the various options available to minimize the effects of noise.
• Counteract noise in control circuit, main circuit, and ground wiring.
• Use Yaskawa-recommended cables, or another type of shielded line. Ground the shield on the
controller side or on the drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise and use surge suppressors
if required.
• Separate all wiring for communications devices from drive input power lines. Install an EMC noise
filter to the input side of the drive input power.
Control Fault
CF
A torque limit was reached continuously for three seconds or longer during a ramp to stop while in
Open Loop Vector Control.
Check the motor parameter settings and repeat Auto-Tuning.
Set the torque limit to the most appropriate setting (L7-01 through L7-04).
• 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.
Current Offset Fault
CoF
The current sensor is damaged or there was residual induction current in the motor (e.g., during sudden
deceleration or when coasting) when the drive attempted to start the motor.
• Create a motor restart sequence that allows enough time for the residual induction voltage to
dissipate.
• Enable Speed Search at start (b3-01 = 1). Use the multi-function terminals to execute External Speed
Search 1 and 2 (H1-oo = 61 or 62).
Note: When using a PM motor, both External Speed Search 1 and 2 perform the same operation.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution

6.4 Fault Detection

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