General information for the installation of safety encoders
NOTICE
Improperly carried out work on drives with functionally safe motor options.
Loss of the safety function.
- Improperly carried out work on drives with functionally safe motor options can result in loss of the safety functions. This can cause injuries and damage.
- Only qualified specialists are allowed to carry out work on drives with functionally safe motor options.
- For EK8Z, EK9Z, AK8Z safety encoders, work on the MOVILINK® DDI communication unit is not permitted. Place an order with SEW-EURODRIVE Service to have any necessary work on the encoder performed.
- With the EI7C FS built-in encoder, no work may be performed on the encoder. Place an order with SEW-EURODRIVE Service to have any necessary work on the encoder performed.
- When using an encoder mounting adapter to retrofit a safety encoder, the retrofitting of the FS motor option is not identifiable on the motor, e.g. by the FS logo on the motor nameplate. If retrofitting of a safety encoder is performed by the user, the user accepts responsibility and liability. Retrofitting by SEW-EURODRIVE Service is recommended.
When used in a safety function, safety encoders have to meet increased requirements in terms of the mechanical mounting and the connection between the encoder shaft and motor shaft. Note that greases and oils must not be allowed on the mechanical connections of the safety encoders during assembly or operation.
SEW‑EURODRIVE meets the requirements of functional safety for the safety encoders in terms of the unwanted loosening of the encoder mounting and the connection between the encoder shaft and the motor shaft. Fault exclusion in compliance with EN 61800‑5‑2 is assumed. Safety-relevant connecting elements are marked in the delivery state, for example using a locking compound or an adhesive label.
The following options are available for performing work on safety encoders or on the motor when the marked, safety-relevant connections need to be opened:
- Place an order with SEW-EURODRIVE Service to perform the work.
- Perform the work yourself.
When performing the work yourself:
Note that all work on the safety encoder and its mechanical coupling is carried out at your own risk. The user is responsible and liable for proper fulfillment of the work. The user has to ensure the traceability of the performed changes regarding functional safety.
Where applicable, pay particular attention to differing tightening torques or additional work steps that are described in this documentation.
In case of proven compliance with the activities described in this documentation for the safety encoder, the characteristics regarding functional safety described by the manufacturer are maintained.
Type of work | Work permitted? | Comment |
|---|---|---|
Replacing the safety encoder | ✔ | Replacement with a structurally identical safety encoder (same encoder type). EI7C FS: Replacing the safety encoder is not permitted. EK8Z, EK9Z, AK8Z: Replacing the MOVILINK® DDI communication unit is not permitted. |
Replacing the existing encoder with a safety encoder | – | The subsequent replacement of an encoder with a safety encoder is only permitted if performed by SEW-EURODRIVE Service. |
Changes to the safety encoder | – | The safety certification and any right to claim under limited warranty of SEW-EURODRIVE become void if the user modifies the safety encoder. |
Loosening the central retaining screw of the insulation coupling [1891] | ✔ | In case of service, loosen only the central retaining screw. If other screws are loosened, the insulation coupling is damaged [1891]. |
Retrofitting a safety encoder using an encoder mounting adapter | ✔ | If retrofitting of a safety encoder is performed by the user, the user accepts responsibility and liability. Retrofitting by SEW-EURODRIVE Service is recommended. |
✔ | Yes |
– | No |
