S2
Pushbutton: Start, high speed
S3
Pushbutton: Reset
S4
Pushbutton: Stop motor
Q1
Motor starter protector
Q11
3RW55 soft starter
Q21
Main contactor for low speed
Q31
Main contactor for high speed
K1
Contactor relay for switching delay (response delay 500 ms)
M
Motor
PE
Protective conductor
P1
Indicator light: Motor rotates at low speed
P2
Indicator light: Motor rotates at high speed
P3
Indicator light: Error
A.3.10
3RW55 soft starter with direct-on-line starting (DOL) as emergency start
Requirements
• 3RW55 soft starter
• Parameterization required
WARNING
Automatic restart.
Can cause death or serious injury.
If a starting command is pending, a restart will be triggered automatically after the reset. This
particularly applies if the motor protection has tripped. Dangerous states of the system can
result.
Reset the start command (e.g. via the PLC or switch) before performing a reset.
To do this, for example, link the group error output (terminals 95 and 96) into the control.
Example circuits
A.3 Special applications
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
330
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006