Fault 28 FCB drive functions

Subfault: 28.1 Description: FCB 11/12 – Searching zero pulse timeout
	Response: Emergency stop + output stage inhibit
Cause	Measure
Failed to find zero pulse of encoder's C track within specified search time during reference travel.	Check the encoder wiring.

Subfault: 28.1

Description: FCB 11/12 – Searching zero pulse timeout

Response: Emergency stop + output stage inhibit

Cause

Measure

Failed to find zero pulse of encoder's C track within specified search time during reference travel.

Check the encoder wiring.

Subfault: 28.2 Description: FCB 11/12 – Hardware limit switch before reference cam
	Response: Emergency stop + output stage inhibit
Cause	Measure
The hardware limit switch was reached during reference travel. The reference cam was not detected.	Make sure that the reference cam is not installed downstream of the hardware limit switch.

Subfault: 28.2

Description: FCB 11/12 – Hardware limit switch before reference cam

Response: Emergency stop + output stage inhibit

Cause

Measure

The hardware limit switch was reached during reference travel. The reference cam was not detected.

Make sure that the reference cam is not installed downstream of the hardware limit switch.

Subfault: 28.3 Description: FCB 11/12 – Hardware limit switch and reference cam not flush
	Response: Emergency stop + output stage inhibit
Cause	Measure
Hardware limit switch and reference cam not mounted flush.	Make sure that the reference cam and the hardware limit switch are mounted flush.

Subfault: 28.3

Description: FCB 11/12 – Hardware limit switch and reference cam not flush

Response: Emergency stop + output stage inhibit

Cause

Measure

Hardware limit switch and reference cam not mounted flush.

Make sure that the reference cam and the hardware limit switch are mounted flush.

Subfault: 28.4 Description: FCB 11/12 – Faulty reference offset
	Response: Emergency stop + output stage inhibit
Cause	Measure
Error determining reference offset.	– Make sure that the reference offset is smaller than the "Modulo maximum" limit value. – When using a single-turn absolute encoder, make sure that the reference offset is larger than one encoder revolution. – Ensure that an encoder has been configured as a source of the actual position when assigning the encoder.

Subfault: 28.4

Description: FCB 11/12 – Faulty reference offset

Response: Emergency stop + output stage inhibit

Cause

Measure

Error determining reference offset.

– Make sure that the reference offset is smaller than the "Modulo maximum" limit value.

– When using a single-turn absolute encoder, make sure that the reference offset is larger than one encoder revolution.

– Ensure that an encoder has been configured as a source of the actual position when assigning the encoder.

Subfault: 28.5 Description: FCB 11/12 – Referencing not possible
	Response: Emergency stop + output stage inhibit
	Cause	Measure
	The reference travel type "Absolute encoder position" is only permitted for absolute encoders in the position mode "Linear mode" or "Single-turn absolute position".	– Adjust the position mode of the encoder. – Use another reference travel type
	In the active drive train during encoder assignment, no encoder was specified as the source of the actual position.	Set an encoder as the source of the actual position.

Subfault: 28.6 Description: FCB 11/12 – Limit switch/reference cam not flush/overlapping with fixed stop
	Response: Emergency stop + output stage inhibit
	Cause	Measure
	During reference travel to fixed stop, a hardware limit switch and a reference cam were simultaneously hit.	Check if the position of the hardware limit switch and reference cam are properly configured for the reference travel.
	During reference travel to fixed stop and active speed changeover at hardware limit switch or reference cam, the fixed stop has been reached without the hardware limit switch or reference cam being hit.	Check if the position of the hardware limit switch and reference cam are properly configured for the reference travel.

Subfault: 28.7 Description: FCB 21 – Required total torque too high
	Response: Output stage inhibit
Cause	Measure
The required total torque is greater than the permitted maximum torque at the motor shaft. The total torque is calculated from the torque specification and the determined/specified load torque.	– Reduce the torque input. – Change the direction of rotation. – Increase the power of the drive.

Subfault: 28.7

Description: FCB 21 – Required total torque too high

Response: Output stage inhibit

Cause

Measure

The required total torque is greater than the permitted maximum torque at the motor shaft. The total torque is calculated from the torque specification and the determined/specified load torque.

– Reduce the torque input.

– Change the direction of rotation.

– Increase the power of the drive.

Subfault: 28.8 Description: FCB 21 – Total torque not reached
	Response: Output stage inhibit
Cause	Measure
The required total torque (at least 90%) was not reached. The total torque is calculated from the torque specification and the determined/specified load torque.	– Reduce the torque input. – Check the limit values of the inverter. – Check the motor connection.

Subfault: 28.8

Description: FCB 21 – Total torque not reached

Response: Output stage inhibit

Cause

Measure

The required total torque (at least 90%) was not reached. The total torque is calculated from the torque specification and the determined/specified load torque.

– Reduce the torque input.

– Check the limit values of the inverter.

– Check the motor connection.

Subfault: 28.9 Description: FCB 18 – Rotor position identification not possible
	Response: Output stage inhibit
	Cause	Measure
	Rotor position identification with an incremental encoder was aborted.	– Restart the rotor position identification. – Check if the encoder is properly connected. – Check whether the encoder is defective.
	Result of rotor position identification (measured encoder offset) cannot be stored in encoder.	Store the measured encoder offset in the inverter
	In "Automatic" operating mode, the result of the rotor position identification (the measured encoder offset) cannot be saved in the encoder. In this operating mode, the measured value may be saved only in the inverter	– Set the "Manual" operating mode. or – Store the measured encoder offset in the inverter.

Subfault: 28.10 Description: FCB 25 – Unbalanced motor phases
	Response: Output stage inhibit
Cause	Measure
Significantly different values determined in the 3 phases while measuring stator resistances.	– Check if the motor is properly connected. – Check all contact points on the motor and inverter. – Check the motor and motor cable for damage.

Subfault: 28.10

Description: FCB 25 – Unbalanced motor phases

Response: Output stage inhibit

Cause

Measure

Significantly different values determined in the 3 phases while measuring stator resistances.

– Check if the motor is properly connected.

– Check all contact points on the motor and inverter.

– Check the motor and motor cable for damage.

Subfault: 28.11 Description: FCB 25 – High impedance motor phase
	Response: Output stage inhibit
Cause	Measure
At least one motor phase could not be measured during motor parameter measurement.	– Check if the motor is properly connected. – Check all contact points on the motor and inverter. – Check the motor and motor cable for damage.

Subfault: 28.11

Description: FCB 25 – High impedance motor phase

Response: Output stage inhibit

Cause

Measure

At least one motor phase could not be measured during motor parameter measurement.

– Check if the motor is properly connected.

– Check all contact points on the motor and inverter.

– Check the motor and motor cable for damage.

Subfault: 28.12 Description: FCB 25 – Stator resistance measurement timeout
	Response: Output stage inhibit
Cause	Measure
Motor parameter measurement activated while motor is turning.	– Stop motor. – Start motor parameter measurement when the motor is at standstill.

Subfault: 28.12

Description: FCB 25 – Stator resistance measurement timeout

Response: Output stage inhibit

Cause

Measure

Motor parameter measurement activated while motor is turning.

– Stop motor.

– Start motor parameter measurement when the motor is at standstill.

Subfault: 28.13 Description: FCB 25 – Characteristic curve identification not possible
	Response: Output stage inhibit
Cause	Measure
The characteristic curve cannot be clearly identified by the motor parameter measurement.	Contact SEW‑EURODRIVE Service.

Subfault: 28.13

Description: FCB 25 – Characteristic curve identification not possible

Response: Output stage inhibit

Cause

Measure

The characteristic curve cannot be clearly identified by the motor parameter measurement.

Contact SEW‑EURODRIVE Service.

Subfault: 28.14 Description: Modulo minimum and modulo maximum not plausible
	Response: Emergency stop + output stage inhibit
Cause	Measure
The value of the "Modulo minimum" parameter is greater than the value of the "Modulo maximum" parameter.	Check the parameter values.

Subfault: 28.14

Description: Modulo minimum and modulo maximum not plausible

Response: Emergency stop + output stage inhibit

Cause

Measure

The value of the "Modulo minimum" parameter is greater than the value of the "Modulo maximum" parameter.

Check the parameter values.

Subfault: 28.15 Description: FCB 25 – Timeout
	Response: Output stage inhibit
Cause	Measure
Measuring of rotor resistance, leakage inductance, and stator inductance not completed.	Contact SEW‑EURODRIVE Service.

Subfault: 28.15

Description: FCB 25 – Timeout

Response: Output stage inhibit

Cause

Measure

Measuring of rotor resistance, leakage inductance, and stator inductance not completed.

Contact SEW‑EURODRIVE Service.

Subfault: 28.18 Description: FCB 21 – Brake missing
	Response: Application stop + output stage inhibit
Cause	Measure
No brake has been parameterized in the inverter. However, a brake is required to perform the brake test.	– Parameterize the brake in drive train 1. – Start FCB 21 again.

Subfault: 28.18

Description: FCB 21 – Brake missing

Response: Application stop + output stage inhibit

Cause

Measure

No brake has been parameterized in the inverter. However, a brake is required to perform the brake test.

– Parameterize the brake in drive train 1.

– Start FCB 21 again.

Subfault: 28.19 Description: FCB 21 – Encoder missing
	Response: Application stop + output stage inhibit
Cause	Measure
No encoder has been parameterized in the inverter. However, an encoder is required to detect a movement of the drive.	– Parameterize the encoder in drive train 1. – Use an encoder for speed control or position control. – Start FCB 21 again.

Subfault: 28.19

Description: FCB 21 – Encoder missing

Response: Application stop + output stage inhibit

Cause

Measure

No encoder has been parameterized in the inverter. However, an encoder is required to detect a movement of the drive.

– Parameterize the encoder in drive train 1.

– Use an encoder for speed control or position control.

– Start FCB 21 again.

Subfault: 28.20 Description: FCB 21 – Load torque not within tolerance range
	Response: Application stop + output stage inhibit
Cause	Measure
The measured load torque is outside of the permitted range. The permitted range is defined by the "Load torque" and "Permitted load torque tolerance" parameters as follows: Load torque ± permitted load torque tolerance	– Check the load torque of the system. – Check the value of the "load torque" parameter. – Check the value of the "permissible load torque tolerance" parameter.

Subfault: 28.20

Description: FCB 21 – Load torque not within tolerance range

Response: Application stop + output stage inhibit

Cause

Measure

The measured load torque is outside of the permitted range. The permitted range is defined by the "Load torque" and "Permitted load torque tolerance" parameters as follows:

Load torque ± permitted load torque tolerance

– Check the load torque of the system.

– Check the value of the "load torque" parameter.

– Check the value of the "permissible load torque tolerance" parameter.

Subfault: 28.21 Description: FCB 09 – Position overshoot through changes to the active travel order
	Response: Application stop + output stage inhibit
Cause	Measure
By changing the target position or the profile values during an active travel order, the drive must move beyond the target and then reverse in order to maintain the profile. Because reversing is forbidden in the current operating mode, when the target position is overrun, the drive triggers an error and stops in the permitted direction.	Change the target position/profile values in such a way that it is still possible to stop at the target position.

Subfault: 28.21

Description: FCB 09 – Position overshoot through changes to the active travel order

Response: Application stop + output stage inhibit

Cause

Measure

By changing the target position or the profile values during an active travel order, the drive must move beyond the target and then reverse in order to maintain the profile. Because reversing is forbidden in the current operating mode, when the target position is overrun, the drive triggers an error and stops in the permitted direction.

Change the target position/profile values in such a way that it is still possible to stop at the target position.

Subfault: 28.22 Description: FCB 09 – Wrong touchprobe data source
	Response: Application stop + output stage inhibit
Cause	Measure
For the "Remaining travel from touchprobe 1" operating mode, the data source of the touchprobe used must be set to "Actual position in user unit".	Change the data source of the touchprobe.

Subfault: 28.22

Description: FCB 09 – Wrong touchprobe data source

Response: Application stop + output stage inhibit

Cause

Measure

For the "Remaining travel from touchprobe 1" operating mode, the data source of the touchprobe used must be set to "Actual position in user unit".

Change the data source of the touchprobe.

Subfault: 28.23 Description: Minimum speed too high
	Response: Output stage inhibit
Cause	Measure
Minimum speed greater than application limit of the speed.	– Reduce the minimum speed. or – Increase the application limit.

Subfault: 28.23

Description: Minimum speed too high

Response: Output stage inhibit

Cause

Measure

Minimum speed greater than application limit of the speed.

– Reduce the minimum speed.

– Increase the application limit.

Subfault: 28.24 Description: FCB 05 – Limits of skip range outside setpoint limits
	Response: Output stage inhibit
Cause	Measure
The speed range of the active speed resonance skip function is larger than the permissible setpoint range. Both the minimum speed and the application limit are within the skip range. As such, each setpoint falls within the skip range.	– Speed resonance range – Adjust skip function. – Adjust the minimum speed. – Adjust the application limit.

Subfault: 28.24

Description: FCB 05 – Limits of skip range outside setpoint limits

Response: Output stage inhibit

Cause

Measure

The speed range of the active speed resonance skip function is larger than the permissible setpoint range. Both the minimum speed and the application limit are within the skip range. As such, each setpoint falls within the skip range.

– Speed resonance range – Adjust skip function.

– Adjust the minimum speed.

– Adjust the application limit.

Subfault: 28.25 Description: FCB 11/12 – Faulty reference offset of encoder 1
	Response: Emergency stop + output stage inhibit
Cause	Measure
Error determining reference offset for encoder 1.	– Make sure that the reference offset is smaller than the "Modulo maximum" limit value. – When using a single-turn absolute encoder, ensure that the reference offset is not greater than one encoder rotation.

Subfault: 28.25

Description: FCB 11/12 – Faulty reference offset of encoder 1

Response: Emergency stop + output stage inhibit

Cause

Measure

Error determining reference offset for encoder 1.

– Make sure that the reference offset is smaller than the "Modulo maximum" limit value.

– When using a single-turn absolute encoder, ensure that the reference offset is not greater than one encoder rotation.

Subfault: 28.27 Description: FCB 11/12 – Reference cam and hardware limit switch active
	Response: Emergency stop + output stage inhibit
Cause	Measure
During reference travel, the hardware limit switch was hit when the reference cam was active.	– Check the position of the reference cam to the hardware limit switch. – Check the signal of the reference cam.

Subfault: 28.27

Description: FCB 11/12 – Reference cam and hardware limit switch active

Response: Emergency stop + output stage inhibit

Cause

Measure

During reference travel, the hardware limit switch was hit when the reference cam was active.

– Check the position of the reference cam to the hardware limit switch.

– Check the signal of the reference cam.