Failsafe - Siemens SIRIUS 3RW55 Equipment Manual

Safety information

2.7 Failsafe

Complying with standards
Increased danger in Class I and Class II Hazardous Locations means it is necessary to comply with
the following standards carefully:
• IEC / EN 60079-14 / VDE 0165-1: For electrical apparatus for Class I and Class II Hazardous
Locations.
• IEC / EN 60079-17: Inspection and maintenance of electrical installations in hazardous areas.
• EN 50495: Safety devices required for the safe functioning of equipment with respect to
explosion risks.
ATEX/IECEx-specific safety data
You will find ATEX / IECEx-specific safety data on the 3RW55 and 3RW55 Failsafe soft starters in
the Technical specifications (Page 285).
Maintenance and repairs
The 3RW55 and 3RW55 Failsafe soft starters are maintenance-free. The repair of soft starters
with approval according to IEC 61508 / EN ISO 13849 is only permissible in the manufacturer's
plant.
Any repair to the 3RW55 and 3RW55 Failsafe soft starters that is not performed in the
manufacturer's plant will result in loss of ATEX/IECEx approval.
Restoration of the factory setting of the 3RW55 soft starter
Restoration of the factory setting of the 3RW55 or 3RW55 Failsafe soft starter in active Ex
operation is only permissible via the master RESET button on the 3RW5 HMI High Feature. This
resets the parameters of the 3RW55 and 3RW55 Failsafe soft starters to the factory settings.
After restoration of the factory settings, you have to parameterize the 3RW55 and 3RW55
Failsafe soft starters again for use in Class I and Class II Hazardous Locations.
You will find further information on parameterization of the 3RW55 and 3RW55 Failsafe soft
starters for use in Class I and Class II Hazardous Locations in chapter Ex operation (Page 207).
2.7 Failsafe
Loss of the safety function due to incorrectly set rated operational current I
Can cause death or serious injury.
Using a motor with too low rated operational current I
mechanisms. Safety-related shutoff by the safety function "Safe Torque Off" (STO) can no longer
be guaranteed.
Make sure that the rated operational current I
operational current I
20
WARNING
of the 3RW55 Failsafe soft starter used.
e
can disable error detection
e
of the motor is in the range of the settable rated
e
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
.
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