Siemens SIRIUS 3RW55 Equipment Manual page 17

Technical specifications (Page 285) in section "Power electronics" or in Catalog IC 10
support.industry.siemens.com/cs/ww/en/view/109747945).
Note
Temperature sensor
For ATEX / IECEx-certified motor protection, use of the PTC type A sensor only is approved.
Note
Simulation Tool for Soft Starters
Note that the Simulation Tool for Soft Starters (Page 44) already takes into account the derating
for certain ambient temperatures, when you select a suitable 3RW5 soft starter.
Parameterization of the 3RW55 and 3RW55 Failsafe soft starters
You are supported with parameterizing 3RW55 and 3RW55 Failsafe soft starters for ATEX / IECEx
applications by the menu in the 3RW5 HMI High Feature. Activate the function "Ex application"
(Page 207) to deactivate impermissible settings of the ATEX/IECEx relevant parameters. Set all
relevant parameters in the same menu.
Setting the rated motor operational current
Set the 3RW55 or 3RW55 Failsafe soft starters to the rated operational current of the motor as
stated on the type plate or design test certificate of the motor.
Trip class (electronic overload protection)
Make sure that the motor and the cables are dimensioned for the selected trip class.
The rated data of the 3RW55 and 3RW55 Failsafe soft starters refers to normal starting
(CLASS 10E). For heavy starting (> CLASS 10E) you may have to overdimension the 3RW55 or
3RW55 Failsafe soft starter.
Parameterizing the motor protection functions (RESET setting)
Note that the "Auto RESET" setting is not permissible when operating motors in Class I and Class
II Hazardous Locations.
If you have activated the function "Ex application" (Page 207), the parameter "Response to
overload" is permanently set to "Turn off without restart".
Short-circuit protection
The 3RW55 and 3RW55 Failsafe soft starters do not include short-circuit protection. Make sure
that short-circuit protection is provided.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Safety information
2.6 ATEX / IECEx
(https://
17