Additional Information - Siemens SIRIUS 3RW5 Equipment Manual

Soft starters and solid-state switching devices
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Configuring
6.4 Operation on failure of the bus connection to the controller
6.4
Operation on failure of the bus connection to the controller
An interruption in the connection between the 3RW5 soft starter and the controller must not
result in an undefined plant status.
Depending on the 3RW5 soft starter, you can set parameters that define the behavior of the
3RW5 soft starter on interruption of the connection with the controller in "Automatic" mode.
● 3RW50 and 3RW52 Soft Starters (Page 88)
● 3RW55 and 3RW55 Failsafe Soft Starters (Page 89)
6.4.1
3RW50 and 3RW52 Soft Starters
The 3RW50 and 3RW52 soft starters do not support the parameters for
"Operation with CPU / Master". On failure of the bus connection or CPU stop, all bits of the
process image output (PIQ) are set to 0. In reference to the operating mode, the 3RW50
and 3RW52 soft starters respond as follows:
● 3RW50 soft starter: The 3RW50 soft starter behaves in accordance with the parameter
"Control via digital input" (Page 39).
● 3RW52 soft starter with firmware version earlier than V2.0.1: The 3RW52 soft starter
remains in the "Automatic" mode or switches to the "Automatic" mode.
Note
Response of 3RW52 soft starter in the event of bus connection failure or CPU stop
(3RW52 soft starter with firmware version earlier than V2.0.1)
To enable you to continue controlling the 3RW52 soft starter in the "Automatic" mode on
failure of the bus connection, you require a 3RW5 HMI (accessory) which enables you to
switch to the "Manual operation local" mode (Page 32).
Without 3RW5 HMI you cannot control the 3RW52 soft starter until the bus connection
has been restored.
Alternatively, you can remove the 3RW5 communication module (Page 49). Then restore
the 3RW52 soft starter on the device to the factory setting, in order to switch to the
"Manual operation local - Input controlled" mode.
● 3RW52 soft starter from firmware version V2.0.1: The 3RW52 soft starter behaves in
accordance with the parameter "Control via digital input" (Page 39).

Additional information

You will find more information on restoring the factory setting on the device in the
Equipment Manual of the 3RW52 soft starter.
88
SIRIUS 3RW5 Modbus communication module
Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003

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