Ex Operation - Siemens SIRIUS 3RW55 Equipment Manual

8.14.2

Ex operation

Requirements
Loss of the certified motor overload protection according to ATEX/IECEx.
Will cause death or serious injury.
Note that operation of a 3RW55 soft starter in the motor connection type "Standard" without
implementing one of the two following remedial measures for the following line voltages
results in loss of certified motor overload protection according to ATEX/IECEx (does not apply to
3RW55 Failsafe soft starters):
• Soft starter 200 - 480 V: for line voltage > 440 V (+10%)
• Soft starter 200 - 600 V: for line voltage > 500 V (+10%)
• Soft starter 200 - 690 V: for line voltage > 560 V (+10%)
Depending on the structure of the circuit, choose one of the following possibilities for ensuring
certified motor overload protection according to ATEX / IECEx:
• Use an additional line contactor in the main circuit.
• For a motor feeder configuration with a circuit breaker, use an additional undervoltage trip
Loss of the certified motor overload protection according to ATEX/IECEx.
Will cause death or serious injury.
Note that operation of a 3RW55 or 3RW55 Failsafe soft starter with motor connection type
"Inside-delta" without implementing one of the two following remedial measures results in loss
of certified motor overload protection according to ATEX/IECEx:
Depending on the structure of the circuit, choose one of the following possibilities for ensuring
certified motor overload protection according to ATEX / IECEx:
• Use an additional line contactor in the main circuit (in the supply cable or in the delta
• For a motor feeder configuration with a circuit breaker, use an additional undervoltage trip
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
DANGER
Connect the line contactor at outputs 95, 96 and 98 (output 3).
You will find more information in chapter Type of motor connection "Standard" (inline) in Ex
operation (Page 305).
unit.
Connect the undervoltage trip unit at outputs 95, 96 and 98 (output 3).
You will find more information in chapter Connecting (Page 71).
DANGER
connection).
Connect the line contactor at outputs 95, 96 and 98 (output 3).
You will find more information in chapter Type of motor connection "inside delta" in Ex
operation (Page 307).
unit.
Connect the undervoltage trip unit at outputs 95, 96 and 98 (output 3).
You will find more information in chapter Connecting (Page 71).
Functions
8.14 ATEX / IECEx
207