Siemens SIRIUS 3RW55 Equipment Manual page 193

Parameter
Parameter
Emergency run
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
Description
Disable (factory setting)
The "Emergency run" function is disabled. Activation of the emergency run is not possible. If the
3RW55 soft starter detects a failed power semiconductor, it generates an error with trip command
and the message text "Switching element L* failed".
Manually enable/disable
The "Emergency run" function can be manually enabled or disabled using command / control com‐
mand.
• Manual enabling following failure of a power semiconductor:
If the 3RW55 soft starter detects a failed power semiconductor, it generates an error with trip
command and the message text "Switching element L* failed". You can use the command /
control command "Enable emergency run" (Page 232) to activate the emergency run. Activation
of the emergency run results in the error being acknowledged and the 3RW55 soft starter
switches back into the previously active operating state. The active emergency run is accompa‐
nied by a warning with the following message text "2-phase control with defective thyristor
active".
• Manual enabling prior to failure of a power semiconductor:
In the event of the failure of a power semiconductor, the 3RW55 soft starter responds in the same
way as when the "Emergency run" parameter is set to "Enabled".
An active emergency run (failure of a power semiconductor) is not stored with non-volatile tripping
status in the 3RW55 soft starter. The emergency run remains active until the command / control
command is revoked ("Disable emergency run"), the "Emergency run" function (parameter) is deac‐
tivated or the supply voltage (control supply voltage) is switched off.
Enable
The "Emergency run" function is enabled. If the 3RW55 soft starter detects a failed power semicon‐
ductor, the emergency run is activated automatically and the 3RW55 soft starter generates a warning
with the message text "2-phase control with defective thyristor active".
If the motor is starting during the failure of a power semiconductor, starting is aborted and the motor
restarted with a 2-phase control. This can effect the motor by causing bucking or a drop in operating
speed.
If the motor is in run-down during the failure of a power semiconductor, the run-down is terminated
with the stopping mode "Coasting down". Only then can the stopping modes "Voltage ramp", "Torque
control" or "Pump stopping mode" be parameterized again. If one of the 3 DC braking modes is
parameterized as the stopping mode, the 3RW55 soft starter alternatively uses the stopping mode
"Coasting down".
The active emergency run (failure of a power semiconductor) is not stored with non-volatile tripping
status in the 3RW55 soft starter. The emergency run remains active until the function is disabled or
the failed power semiconductor has been replaced.
Functions
8.11 Emergency mode
193