CAUTION
Internal Threshold Settings
The default values of these parameters will not normally be changed.
Consult Siemens customer service before changing any of these parameters.
Unauthorized changes could result in the system not being adequately protected.
7.9.5 System Arc Detection
It is a safety requirement that an arc ash event must be detected as quickly as possible. Once
the risk of arc ash is detected, it is contained and any source that could feed additional energy
into the arc event is rapidly disconnected. The detection circuitry also removes the drive run
enable via the CR3 input to prevent a run command from being issued to the cells.
Arc ash detection is handled external to the control, but a digital input must set SOP ag
"SystemArcFaultDetected_O" to produce an error/fault message and trigger an input
protection. This allows the drive to detect that the input protection has been triggered to record
the event in the event and fault logs and that input power has been removed. This SOP ag will
trigger both an IP protection fault and log the fault message. It will also cause the LFR relay to set
to the tripped position to indicate an IP fault, and require a manual, keyswitch reset.
Fault message "System Arc Detected" will display in the Event Log and Fault Log to indicate a
System Arc Fault has been triggered and MV has been shut down via external means.
Operating the Control
7.9 Input Side Monitoring and Protection
NXGPro+ Control Manual
Operating Manual, A5E50491925A 211
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