Ground Fault - Siemens SIRIUS 3RW55 Equipment Manual

Setting options
• 3RW5 HMI High Feature
Menu: "Parameters > Soft Starter > Asymmetry"
Access protection to the 3RW5 HMI High Feature is not active or has been reset.
• With SIRIUS Soft Starter ES (TIA Portal) via the local interface on the 3RW5 HMI High Feature
Brief overview: Window "Project Navigation" with current project under created Soft Starter >
"Parameters" > Window "Work area" > "Soft Starter > Asymmetry"
• With a fieldbus via a 3RW5 communication module:
– With SIRIUS Soft Starter ES (TIA Portal) Premium / Professional (only via a 3RW5 PROFINET
– Configuration software of the control system (e.g. STEP 7 with corresponding HSP)
– User program
You can find additional information on the parameters that can be set via the fieldbus in the
manual of the respective 3RW5 communication module.
Parameters
Parameters
Asymmetry limit warning
Asymmetry limit error
8.10

Ground fault

Operating principle
The "Ground fault" function of the 3RW55 and 3RW55 Failsafe soft starters measures and
monitors all 3 phase currents. By evaluating the summation current of the 3 current values, the
motor feeder can be monitored for a possible fault current or ground fault.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
or PROFIBUS communication module)
Brief overview: See SIRIUS Soft Starter ES (TIA Portal) via the local interface on the
3RW5 HMI High Feature
Description
If the asymmetry exceeds this limit, a warning is generated and the motor continues to run. The
setting "0%" deactivates the limit value.
• Factory setting: 0%
• Limit: 10 ... 60%
• In steps of: 5%
If the asymmetry exceeds this limit, an error is generated and the motor is switched off. The
setting "0%" deactivates the limit value.
• Factory setting: 30%
• Limit: 10 ... 60%
• In steps of: 5%
Functions
8.10 Ground fault
187