Fault 70 Safe brake system

Cause

Measure

Enable signal revoked during safe brake test.

Make sure that the enable signal is active during the safe brake test.

Cause

Measure

Basic unit requested brake application during safe brake test.

Make sure that no drive function is activated or no axis is in fault status.

Cause

Measure

Instance of safety sub-functions STO, SOS, SSx, SSR, SLI or SLP activated during safe brake test.

Make sure that no safety sub-function is activated during the safe brake test (only SLS, SSM are permitted).

Cause

Measure

Measured load torque outside configured tolerance.

Make sure that the load torque deviates only by the configured tolerance value.

Cause

Measure

Basic unit does not deliver parameterized test torque.

– Check the parameterization of the device and adjust if necessary.

– Make sure that the device has enough power for the test torque.

Cause

Measure

Upper limit of configured test range exceeded during safe brake test.

– Configure a sufficiently large test range (test distance > moving clear distance).

– Parameterize the test direction correctly.

– Make sure that the movements can be performed and the system does not slip.

Cause

Measure

Lower limit of configured test range exceeded during safe brake test.

– Configure a sufficiently large test range (test distance > moving clear distance).

– Parameterize the test direction correctly.

– Make sure that the movements can be performed and the system does not slip.

Cause

Measure

Measured retraction distance differs from parameterized retraction distance by more than "Distance tolerance positioning" parameter.

– Check the parameterization of the device and adjust if necessary.

– Check the value of parameter "Distance tolerance positioning" and increase if necessary.

– Make sure that the device has enough power for the test torque.

Cause

Measure

FCB BDS in basic device returned an unexpected value. Device cannot reach configured load torques or cannot maintain position.

Do not activate higher-priority FCB BDS in the basic unit during the safe brake test.

Cause

Measure

Faulty communication with basic unit.

– Repeat the test.

– If the fault occurs repeatedly, replace the safety card and send it together with the fault number to SEW‑EURODRIVE. For further support, contact SEW‑EURODRIVE Service.

Cause

Measure

None of the safe digital outputs F-DO is set to brake control.

– Check the parameterization of the safety card.

– Activate the SBC drive safety function on one of the safe digital outputs F‑DO.

– Connect the brake rectifier at the same output channel F‑DO (e.g. SBM drive safety function).

Cause

Measure

Maximum movement permitted in idle state exceeded.

Brake no longer holds torque or device cannot hold load.

– Check the positional tolerance and adjust if necessary.

– Make sure the device delivers the required braking torque.

Cause

Measure

Speed greater than parameterized minimum speed detected at end of retraction positioning.

– Check the parameterization of the device and adjust if necessary.

– Make sure the device is not subject to overload.

Cause

Measure

After ready signal from the basic unit (drive at standstill), a speed greater than the parameterized minimum speed has been detected.

Check the minimum speed, and adjust if necessary.

Cause

Measure

Torque specified by basic unit has wrong effective direction for current test step.

– Check the parameterization of the device and adjust if necessary.

– Make sure that direction of rotation reversal is correct.

Cause

Measure

Safety card parameterized again using Assist CS.. tool while safe brake test is running.

– Acknowledge the fault.

– Restart the safe brake test.

– Do not parameterize the safety card during the safe brake test.

Cause

Measure

Fault acknowledged during safe brake test.

Deactivate the brake test before acknowledging the fault.

Cause

Measure

Limit violation signaled by drive safety function active at the same time (e.g. SLS) during safe brake test.

– Use the fault memory to check which drive safety function signaled the limit violation.

– Refer to the measures in the fault description to eliminate the fault.

Cause

Measure

Fault detected by safety card during safe brake test.

– Use the fault memory to check which fault occurred at the same time.

– Refer to the measures in the fault description to eliminate the fault.

Cause

Measure

No torque or insufficient values measured during load torque test.

– Deactivate the load torque test. To do so, set the load torque for horizontal applications to "0".

– Increase the test duration.

Cause

Measure

No braking torque or insufficient values measured during safe brake test.

– Increase the test duration.

– If the fault occurs repeatedly, replace the device and send it together with the fault number to SEW‑EURODRIVE. For further support, contact SEW‑EURODRIVE Service.

Cause

Measure

The parameters "Duration of torque buildup" and "Duration of torque reduction" require an inverter firmware from version V 6.00.

– Set the value "0" for both parameters.

– Perform a firmware update.