K1
Contactor relay
K2
Contactor relay
K3
Contactor relay
S1
Pushbutton: Reset
S2
Switch: Start slowly CW
S3
Switch: Start slowly CCW
S4
Switch: Start CW soft start
Q1
Motor starter protector
Q11
3RW55 soft starter
M1
Motor
PE
Protective conductor
A.3.5
Control via fieldbus with switchover to manual local operation
Requirements
• 3RW55 or 3RW55 Failsafe soft starter (the example shows the 3RW55 soft starter)
• Parameterization required
• 3RW55 or 3RW55 Failsafe soft starter with an additional 3RW5 communication module
connected via fieldbus
You will find further information in the manual for the 3RW5 communication module in
question.
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
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
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