Functions
7.7 ATEX / IECEx-certified motor overload protection
SIRIUS 3RW50 soft starter
134
Manual, 09/2019, A5E35628455002A/RS-AA/001
Parameterizing the motor protection functions (RESET setting)
Note that the "Auto RESET" setting is not permissible when operating motors in hazardous
areas.
Short-circuit protection
The 3RW50 soft starter does not have short-circuit protection. Make sure that short-circuit
protection is provided.
Line protection
Avoid impermissibly high cable surface temperatures by correctly dimensioning the
cross-sections. Select a sufficiently large conductor cross-section.
Cyclic test of the motor protection functions
Only perform the Self-test (user-test) (Page 179) locally by means of the RESET / TEST key
or the 3RW5 HMI High Feature to ensure that the correct 3RW50 soft starter is tested. Only
in this way can the certified motor overload protection according to ATEX / IECEx be
guaranteed.
On soft starters in ATEX / IECEx applications, perform the Self-test (user-test) (Page 179)
during commissioning and periodically at intervals of no more than 36 months.
Certification of the 3RW50 soft starters
The motor overload protection of the 3RW50 soft starters is ATEX / IECEx-certified to SIL 1.
The 3RW50 soft starters are approved under Equipment Groups I and II, Category (2)
or (M2) in zones "G" and "D". Zones "G" and "D" are areas in which explosive gas, vapor,
mist or air mixtures and combustible dust are present:
IECEx BVS 19.0053 X [Ex]
BVS 19 ATEX F001 X
II (2)G [EX eb Gb] [EX db Gb] [EX pxb Gb]
1)
II (2)D [EX tb Db] [EX pxb Db]
I (M2) [EX db Mb]
1)
For the px applications, pressure and flow rate monitoring are additionally required for the
pressurized enclosure systems.
