Siemens SIRIUS 3RW51 Equipment Manual page 24

Description
3.5 Operating modes and master control function
Fundamental response when changing the mode
A higher-priority mode can fetch control from a lower-priority mode at any time; the reverse is
not possible. Master control can only be returned to the mode with the lowest priority. Control
sources with higher priority must fetch master control from the mode with the lowest priority.
Requirements
• A mode with lower priority can only fetch back control while the motor is switched off.
• For the "Automatic" mode you require a 3RW5 communication module.
"Automatic" mode
Note that the 3RW51 soft starter switch with a firmware version earlier than V2.0.1 switches to
"Automatic" mode after the 3RW5 communication module has been installed in the 3RW51 soft
starter. 3RW51 soft starters with firmware version V2.0.1 and later switch to "Automatic" mode
only with the settings "Manual activation" or "No change on bus error" of the parameter "Control
via digital input".
Receiving master control
"Automatic" mode receives control from the operating mode "manual - bus" or "manual - local"
as follows:
• By disabling the "Manual operation local - input controlled" bit in the process image output
(PIQ) or in the data table "Process image output (PIQ)" (depending on the 3RW5
communication module), the "Automatic" mode receives control from the Input IN.
• "LOCAL / REMOTE" action on the 3RW5 HMI
Withdrawal of master control by other control sources
In "Automatic" mode, control can be withdrawn by any control source.
Operating mode "Manual operation local - input controlled"
Fetching control
By enabling the "Manual operation local - input controlled" bit in the process image output (PIQ)
or in the data table "Process image output (PIQ)" (depending on the 3RW5 communication
module), the Input IN receives master control from the "Automatic" mode or operating mode
"manual - bus".
If master control is on the 3RW5 HMI or, in the case of the local interface, on the 3RW5 HMI High
Feature (higher priority), you must first actively give up master control. The Input IN can then
fetch master control.
Giving back control
By disabling the "Manual operation local - input controlled" bit in the process image output (PIQ)
or in the data table "Process image output (PIQ)" (depending on the 3RW5 communication
module), the "Automatic" mode receives master control.
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Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
SIRIUS 3RW51 Soft Starter