Emergency Run - Siemens SIRIUS 3RW55 Equipment Manual

• Input action (Page 194)
Note
If the control source is "Digital input", only a normally open contact may be connected to this
input. A normally closed contact would result in activation of the emergency start in the
event of a wire break.
• With a fieldbus via a 3RW5 communication module:
– With SIRIUS Soft Starter ES (TIA Portal) Premium / Professional (only via a 3RW5 PROFINET
– Configuration software of the control system (e.g. STEP 7 with corresponding HSP)
– User program
You can find additional information on the parameters that can be set via the fieldbus in the
manual of the respective 3RW5 communication module.
8.11.2

Emergency run

Operating principle
With the "Emergency run" function, the 3RW55 soft starter can continue to run with restricted
functionality after failure of a power semiconductor. This avoids plant shutdown and ensures
restricted operation of the motor and plant.
You set the behavior of the "Emergency run" function with the "Emergency run" parameter. The
"Emergency run" function is disabled in the factory setting, making activation of the emergency
run impossible. The "Emergency run" function can be enabled in every operating state. The
function is not active before the failure of a power semiconductor and has no impact on the
functions of the 3RW55 soft starter.
Effects of the emergency run on the 3RW55 soft starter
The 3RW55 soft starter makes parameter changes automatically when the emergency run
(failure of a power semiconductor) is active. Parameter assignments and function settings that
are not possible when the emergency run (failure of a power semiconductor) is active are not
implemented by the 3RW55 soft starter. After the "Emergency run" function has been disabled
(parameter) or deactivated (command / control command), the parameter assignments and
function settings are implemented again. The following functions are not supported when the
emergency run is active:
• Inside-delta circuit
• DC braking with external braking contactors
• Dynamic DC braking without contactor
• Reversing DC braking with a reversing contactor assembly
• Creep speed
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
or PROFIBUS communication module)
Brief overview: See SIRIUS Soft Starter ES (TIA Portal) via the local interface on the
3RW5 HMI High Feature
Functions
8.11 Emergency mode
191