YASKAWA GA700 Series

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Troubleshooting

7.4 Fault

YASKAWA SIEPC71061705H GA700 Series Technical Manual 321

Code Name Causes Possible Solutions

Electrical interference caused a communication data

error.

• Examine the control circuit lines, main circuit lines, and

ground wiring, and decrease the effects of electrical

interference.

• Make sure that a magnetic contactor is not the source of the

electrical interference, then use a Surge Protective Device if

necessary.

• Use only the recommended cables or other shielded line.

Ground the shield on the controller side or the drive input

power side.

• Separate the communication wiring from drive power lines,

and install a noise filter to the input side of the power supply

for communication.

• Decrease the effects of electrical interference from the

controller.

Note:

• The drive detects this error if it does not correctly receive control data for the CE detection time set to H5-09 [CE Detection Time].

• Do a Fault Reset to clear the fault.

• If the drive detects this error, the drive will operate the motor as specified by the stopping method set in H5-04 [Communication Error Stop Method].

Code Name Causes Possible Solutions

CF Control Fault

Motor parameters are set incorrectly Correctly set the motor parameters and do Auto-Tuning again.

When A1-02 = 4 [Control Method Selection =

Advanced Open Loop Vector], the drive takes long

to ramp to stop because of these settings:

• The torque limit setting is too low.

• L3-11 = 1 [Overvoltage Suppression Select =

Enabled].

• d5-01 = 1 [Torque Control Selection = Torque

Control].

When Rotational Auto-Tuning changes or the installation

environment changes, make sure that you do Line-to-Line

Resistance Tuning and set L8-20 = 0 [Control Fault & Step Out

Detect = Disabled].

Note:

After you set L8-20 = 0, do test runs and examine the drive to

make sure that it starts and stops correctly.

The torque limit setting is too low. Adjust L7-01 to L7-04 [Torque Limit].

The load inertia is too large. • Adjust C1-02, C1-04, C1-06, and C1-08 [Deceleration Times].

• Set the frequency reference to the minimum output frequency,

and stop the Run command when the drive stops deceleration.

The drive is trying to ramp to stop a machine that

cannot do ramp to stop or on a machine for which

deceleration is not necessary.

Correctly set b1-03 [Stopping Method Selection].

The motor and drive are connected incorrectly. Correct wiring errors.

Line-to-line Resistance Tuning is not done. Do Stationary Auto-Tuning for Line-to-Line Resistance.

The drive received a Run command while the motor

was coasting.

• Examine the sequence and input the Run command after the

motor fully stops.

• Set b3-01 = 1 [Speed Search at Start Selection = Enabled].

Note:

• The drive detects this error if the torque reference is more than the torque limit for 3 seconds or longer while the drive ramps to stop.

• Do a Fault Reset to clear the fault.

Code Name Causes Possible Solutions

CoF Current Offset Fault

The drive starts operation while the induced voltage

stays in the motor (during coasting to a stop or after

fast deceleration).

• Make a sequence that does not restart operation when induced

voltage stays in the motor.

• Set b3-01 = 1 [Speed Search at Start Selection = Enabled].

• Use Speed Search from Fmax or Fref [H1-xx = 61, 62] to do a

speed search through one of the external terminals.

Note:

When controlling the PM motor, External Speed Search

commands 1 and 2 operate the same.

A drive hardware problem occurred. • Do a Fault Reset to clear the fault or de-energize the drive.

• If the fault stays, replace the drive

Note:

• The drive detects this error if the current offset value is more than the permitted setting range while the drive automatically adjusts the current offset.

• Do a Fault Reset to clear the fault.

Code Name Causes Possible Solutions

CP1 Comparator 1 Limit Fault

The monitor value set in H2-20 [Comparator 1

Monitor Selection] was in the range of H2-21

[Comparator 1 Lower Limit] and H2-22

[Comparator 1 Upper Limit].

Examine the monitor value and remove the cause of the fault.

Note: