No Emergency Power option on this group?
Is so, disconnect the input signal or fuse that controls that input.
Is this a new problem on the existing group?
Any new construction additions to the building?
“Frequency Converter” fault sounds like incoming power especially as it affects all cars. Unless it’s only the group controller that takes a momentary dump. Building Engineer doesn’t know of any changes regarding power like upgrading main switching gear etc?
Whose equipment is this?
