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

11.4

Applications Examples for Safety Functions

This section provides examples of using the safety functions.
11.4.1

Connection Example

In the following example, a Safety Unit is used and the HWBB operates when the guard is
opened.
Close
Limit switch
Guard
24-V power
supply
Fuse
0 V
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
enabled.
Note: The EDM1 signal is used as a source output. Connect the EDM1 so that the current flows from EMD1+ to
EMD1-.
11.4.2

Failure Detection Method

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.
G9SX-BC202 Safety
Open
Unit manufactured by
OMRON Corporation
A1 T11 T12 T21 T22
Inputs
Power
supply
Reset/feedback
Outputs
input
inputs
A2 T31 T32 T33 S24 S14

11.4 Applications Examples for Safety Functions

SERVOPACK
CN8
/HWBB1+
4
/HWBB1-
3
/HWBB2+
6
/HWBB2- 5
EDM1+ 8
7
EDM1-

11.4.1 Connection Example

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