Fault correction

The following table describes a selection of faults. Depending on the application, other causes may be responsible for the fault. Conspicuous control behavior is the result of incorrect parameterization of the servo drive.

With multi-axis systems such as the AX8000, malfunctions may have different causes.

Error

Cause

Motor standstill, no starting

1

2

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electric cylinder runs sluggishly

1

 

3

 

5

6

 

8

 

 

 

 

 

 

 

 

 

 

 

Start-up noises

 

 

3

 

5

6

 

 

 

 

11

 

 

 

 

 

 

 

19

Noises during operation

1

 

3

 

5

6

 

8

 

 

11

 

 

 

 

 

 

 

19

High temperature at idling speed

 

 

 

4

 

 

7

 

9

 

 

 

 

 

 

 

 

 

19

High temperature under load

1

 

3

 

 

 

7

8

9

 

 

 

 

 

 

 

 

 

 

Untrue running behavior

 

 

 

 

 

 

 

8

 

10

11

 

 

 

 

 

 

 

19

Grinding noises

 

 

 

 

 

 

 

8

 

 

 

12

 

 

 

 

 

 

19

Brake fault

 

 

 

 

 

 

 

 

 

 

 

 

13

14

 

 

 

 

 

Output stage fault

 

 

 

 

5

 

 

 

 

 

 

 

 

 

15

16

 

 

 

Feedback error

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

18

 

Lack of braking effect

 

 

 

 

5

6

 

 

 

 

 

 

 

 

 

 

 

 

 

Number

Cause

Solution

1

Servo drive not enabled

Set ENABLE signal and enable servo drive

Overload of the electric cylinder

Check the load and if necessary reduce it, then restart and enable the servo drive. Set ENABLE signal

Mechanical blockage of the electric cylinder

Check mechanics and release blockage

Holding brake [+] not released

Check the control configuration of the holding brakes [+] and reconfigure if necessary

2

Phase interruption in the power supply or reversed motor phases

Check servo drive and supply lines and replace any defective cables

3

Phase interruption after power supply

Check servo drive and supply lines and replace any defective cables

Power cable or feedback line with defective shield

Check ground connection and shielding

4

Short-circuit in the voltage supply cable for the holding brake [+]

Replace defective cable, measure and check cable after replacement

Output voltage of the servo drive too low

Check the settings in the configuration and read out the electronic nameplate of the electric cylinder again

Defective holding brake [+]

Replace electric cylinder, then measure and check

5

Short circuit or earth leakage in the motor cable

Replace defective motor cable, then measure and check

6

Power connector not fitted correctly

Check the connectors on the power connector and on the electric cylinder

Interruption in the feedback line or motor cable

Check cables for wire break or crushing. Replace defective cables, then measure and check.

Number

Cause

Solution

7

Required force too high.

Check design or configuration and adjust if necessary

The spindle drive is clamped in the application.

Re-align electric cylinder or use compensating elements, see chapter Mechanical installation

8

Lubrication is not sufficient

Check spindle for contamination and clean if necessary

Check maintenance interval and relubricate if necessary

Check length of working stroke and insert lubrication stroke if necessary

9

Heat dissipation system of the electric cylinder not functioning

Clean the surface of the electric cylinder and the servo drive as well as the heat sinks and exhaust air slots

Check the mounting depth of the servo drives and the electric cylinder.

10

Shield of feedback line or motor cable defective or inadequate

Check ground connection and shielding

11

Servo drive gain is set too high.

Reconfigure the parameters of the servo drive and adjust them if necessary

12

Contamination or foreign bodies inside the electric cylinder

Send in electric cylinder. The repair is carried out by the vendor.

Rotating parts chafing on the housing or electric cylinder components

Inspect chafing parts and readjust if necessary

Defective bearings; irreparable bearing damage

Send in electric cylinder. The repair is carried out by the vendor.

Number

Cause

Solution

13

Short-circuit in the voltage supply cable for the holding brake [+]

Replace defective cable, then measure and check

14

Inadequate power supply of the holding brake [+]

Check the settings in the configuration and read out the electronic nameplate of the electric cylinder again

15

Short circuit or earth leakage in the electric cylinder

Replace defective electric cylinder, then measure and check

16

Insufficient power supply

Check the settings in the configuration and read out the electronic nameplate of the electric cylinder again

17

Interruption or crushing in the feedback line

Check cables for wire break or crushing. Replace defective cables, then measure and check.

18

Power connector of the electric cylinder incorrectly plugged in

Check correct seating of the connector for feedback signals and correct if necessary

Loose fit of the feedback connector or no contact of the plug contacts with the power socket of the electric cylinder

Check the connector assembly. Contact Beckhoff Service if necessary

19

Check spindle surface for damage and contamination

Contact Beckhoff Service, avoid impacts on the spindle and sudden loads during operation and assembly