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Cause: The upper voltage limit was ex-
ceeded
Remedy: Check welding parameters
Cause: The voltage dropped below the 
lower limit
Remedy: Check welding parameters
Cause: The welding device configuration 
has been changed
Remedy: Check LHSB link
Cause: No connection to power source
Remedy: Check connection to power 
source and its software
Cause: Emergency Stop - safety circuit is 
open
Remedy: Contact After-Sales Service
Cause: The VRD (Voltage Reduction De-
vice) function has interrupted the 
welding process
Remedy: Contact After-Sales Service