Applications Examples For Safety Functions; Connection Example; Failure Detection Method - YASKAWA SGD7S Product Manual

E-7-series ac servo drive, e-7s servopack, command option attachable type with devicenet module

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11.4 Applications Examples for Safety Functions

This section provides examples of using the safety functions.

In the following example, a Safety Unit is used and the HWBB operates when the guard is

When the guard is opened, both the /HWBB1 and the /HWBB2 signals turn OFF, and the

EDM1 signal turns ON. Because the feedback circuit is ON while the guard is closed, the

Safety Unit is reset, the /HWBB1 and the / HWBB2 signals turn ON, and the operation is

Note: The EDM1 signal is used as a source output. Connect the EDM1 so that the current flows from EMD1+ to

If a failure occurs (e.g., the /HWBB1 or the /HWBB2 signal remains ON), the Safety Unit is not

reset when the guard is closed because the EDM1 signal remains OFF. Therefore starting is not

possible and a failure is detected.

In this case the following must be considered: an error in the external device, disconnection of

the external wiring, short-circuiting in the external wiring, or a failure in the SERVOPACK. Find

the cause and correct the problem.

Limit switch

Reset/feedback

G9SX-BC202 Safety

Unit manufactured by

OMRON Corporation

Sgdv-oca04a Sgdv-oca05a