5.5 Fault Detection
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 203
Troubleshooting
5
LED Operator Display Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received for two seconds.
Cause Possible Solution
Communications wiring is faulty,
disconnected or a short circuit
exists.
• Check for faulty wiring.
• Correct the wiring.
• Check for loose wiring and short circuits. Repair as needed.
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 wiring, main circuit lines
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. The
shield should be grounded on the controller side or on the drive input power
side.
• Separate all wiring for communications devices from drive input power lines.
Install a noise filter to the input side of the drive input power.
LED Operator Display Fault Name
CF
Control Fault
A torque limit was reached continuously for three seconds or longer during a
ramp to stop while 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 too low. Set the torque limit to the most appropriate setting (L7-01 through 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.
LED Operator Display Fault Name
CPF02
A/D Conversion Error
An A/D conversion error occurred.
Cause Possible Solution
Control circuit is damaged.
Cycle power to the drive. Refer to Using Fault Trace Monitors on page 245.
If the problem continues, replace the drive.
Control circuit terminals have
shorted out (+V, AC).
• Check for wiring errors along the control circuit terminals.
• Correct the wiring.
Check the resistance of the speed potentiometer and related wiring.
Control terminal input current has
exceeded allowable levels.
• Check the input current.
• Reduce the current input to control circuit terminal (+V) to 20 mA.
LED Operator Display Fault Name
CPF03
PWM Data Error
There is a problem with the PWM data.
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