E−3
Components to be combined
Followings are the example of the safety devices to be combined.
Series Model Norms to comply reference certificate
GS9A 301 ISO13849-2 cat4, SIL3 06.06.2007
G9SX GS226-T15-RC IEC61508 SIL1-3 04.11.2004
NE1A SCPU01-V1 IEC61508 SIL3 27.09.2006
In combination with the safety device complying with the class complying PL=d,
PL=d of the inverter is to be achieved.
Periodical check
Since the drive stops even one of the GS1 or GS2 is interrupted, it is to be reconfirmed
that there is not faiure in the path of GS1 and GS2 periodically. Period of this
maintenance is once per year, and the method to make sure GS1 and GS2 in
combination with EDM signal is as described below.
Terminal Status
GS1 current OFF current ON current OFF current ON
GS2 current OFF current OFF current ON current ON
EDM conducted not conducted not conducted not conducted
(output) forbidden forbidden forbidden Allowed
Precautions
1. To assure, that the Safe Disable function appropriately fulfills the safety
requirements of the application, a throughout risk assessment for the whole safety
system has to be carried out.
2. If EDM signal is not utilized in the system as a reconfirmation of redundancy
between GS1 and GS2, PL of drive is downgraded to PL=c.
3. The Safe Disable function does not cut the power supply to the drive and does not
provide electrical isolation. Before any installation or maintenance work is done,
the drives power supply must be switched off.
4. The wiring distance for the Safe Disable inputs should be shorter than 30 m.
5. The time from opening the Safe Disable input until the drive output is switched off
is less than 10 ms.
6. When two or more inverters are connected to common GS1 and GS2 wiring, please
be sure to put the diode as instructed in page 4-14, otherwise the drive may start to
work even in the safety mode.
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