MIREL VZ1, Maintenance And Diagnostics Manual, Page: 23 / 33

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7 System Maintenance
All train protection system components are maintenance-free. No component needs to be
replaced, tuned, or otherwise configured at any time.
Two levels of MIREL VZ1 train protection system maintenance
S1 Operational repairs
S2 Maintenance repairs
Operational repairs (S1) are conducted by the operator's trained personnel. A Repair is per-
formed if any train protection system faults are detected by any level of diagnostics (D1 to
D4) or in connection with a fault indicated during operation of the train protection system.
Operational repairs serve to remedy faults in cabling, power and connections to peripheral
equipment on the locomotive. Operational repairs do not involve any interference inside the
central unit or the signal repeaters in the system.
Maintenance repairs (S2) are performed by the manufacturer or persons trained and author-
ised by the manufacturer. Maintenance repairs are conducted if a fault cannot be resolved
by performing operational repairs (S1). Maintenance repairs are always conducted on the
basis of replacement (replacing the central unit or signal repeater and subsequent repair by
the manufacturer). Maintenance repairs are designed to remedy faults in the central unit and
signal repeaters of the train protection system.
Anyone conducting maintenance on the train protection system must be instructed with re-
gards to occupational safety and must be demonstrably trained to perform such activities
with certification to perform the individual levels of MIREL VZ1 train protection system
maintenance.