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Functions
8.10 Response to bus errors / Control via digital input
Operating principle
The test mode function "Test with small load" is helpful during commissioning and when
troubleshooting, as the correct function of the application can be tested before installation in a
control cabinet or before the use of a motor provided for the application. The "Test with small
load" enables the wiring of the control and main circuit to be checked with the aid of a small
motor (test motor).
In the test mode function "Test with small load", the motor operating states and all functions and
messages can be executed and displayed by the 3RW51 soft starter as in normal operation.
If, during an active "Test with small load", the 3RW51 soft starter detects a lack of main current,
a fault is generated with a shutdown command and the message text "Line voltage for test
required". After connecting the 3RW51 soft starter to the main supply this error message can be
acknowledged with RESET.
The error monitoring functions that are to be attributed to a missing or inadequate main supply
are not active. The test mode function "Test with small load" remains active until the test mode
function is deactivated.
The motor and intrinsic device protection functions of the 3RW51 soft starter remain active
according to their parameterization and are not influenced by the test mode function "Test with
small load".
Setting options
• 3RW5 HMI High Feature (firmware version V2.0 or higher)
Access protection to 3RW5 HMI High Feature is not active or has been reset.
Menu: "Parameters > Soft Starter > Additional parameters"
• With a fieldbus via a 3RW5 communication module (only via a 3RW5 PROFINET or PROFIBUS
communication module):
– Configuration software of the control system (e.g. STEP 7 with corresponding HSP)
– User program
8.10
Response to bus errors / Control via digital input
Requirements
• 3RW51 soft starter from firmware version V2.0.1
Note
3RW51 soft starter with firmware version earlier than V2.0.1:
The 3RW51 soft starter responds in accordance with the setting "Manual activation".
102
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
SIRIUS 3RW51 Soft Starter
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