Siemens SIRIUS 3RW51 Equipment Manual page 23

Priorities of the operating modes
The following modes are available (in ascending order of priority):
Mode
Automatic
Manual oper‐
ation local
If the connection to the control source is aborted, the control priority automatically switches
back to the lowest priority of the current mode.
Connection abort
On failure of the bus connection or a CPU stop, the 3RW51 soft starter behaves as follows,
irrespective of the mode:
• 3RW51 soft starter with firmware version earlier than V2.0.1: The 3RW51 soft starter remains
in "Automatic" mode or switches to "Automatic" mode.
Note
Response of 3RW51 soft starter in the event of bus connection failure or CPU stop
(3RW51 Soft Starter with firmware version earlier than V2.0.1)
To enable you to continue controlling the 3RW51 soft starter after failure of the bus
connection or CPU stop, you will need a 3RW5 HMI (accessory), which enables you to switch
to "Manual operation local" mode.
Without 3RW5 HMI, you cannot control the 3RW51 soft starter until the bus connection has
been restored.
Alternatively, you can remove the 3RW5 communication module. Then restore the 3RW51
soft starter on the device to the factory setting (Page 155) in order to switch to "Manual
operation local ‑ Input controlled" mode.
• 3RW51 soft starter from firmware version V2.0.1: The 3RW51 soft starter behaves in
accordance with the parameter "Control via digital input (Page 102)".
If other connections between the control source and 3RW51 soft starter are aborted, control
automatically switches back to the lowest priority of the current mode.
• "Automatic" mode: The 3RW51 Soft Starter responds as it does upon failure of the bus
connection or CPU stop.
• Operating mode "manual - local": Control switches to "Manual - local ‑ Input controlled".
Additional information
You will find further information on the 3RW5 communication modules in the manual for the
3RW5 communication module used.
SIRIUS 3RW51 Soft Starter
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
Control
source
Fieldbus
Input control‐ Digital inputs Input actions control
led
3RW5 HMI 3RW5 HMI
controls
3.5 Operating modes and master control function
Control of the 3RW5 soft starter
PROFINET and PROFIBUS: PLC controls
Modbus: Modbus client (e.g. PLC) con‐
trols
3RW5 HMI controls
Description
Priority
Lowest
↓
Highest
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