MIREL VZ1, Maintenance And Diagnostics Manual, Page: 24 / 33

154VZ1 : 190111
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7.1 S1 – Operational Repairs
Execution:
The train protection system operator's trained personnel or other demonstrably authorised
and trained persons
Schedule:
If any train protection system faults are detected by any of the diagnostic controls (D1 to D4)
or in connection with a fault indicated during operation of the train protection system.
Description:
Operational repairs serve to remedy faults in:
§ Power to the central unit
§ Power to the signal repeaters
§ Cabling
§ Connection of the incremental RPM sensor
§ Connection of the pressure sensor in the main brake pipe
§ Code sensor connections
§ Connectors
§ Connections of input and output circuits
§ Dead man's button connections
§ Mechanical anchors
The portions of the D3 functional test that can be of assistance in more precisely determin-
ing the exact faults involved should be performed before proceeding to S1 operational re-
pairs. Faults involving the central unit of the train protection system or the signal repeaters
are resolved by replacing the specific component. Personnel must have approved technical
and installation documentation for the system, in addition to the maintenance manual, when
conducting operational repairs and must follow the provisions of such documentation for the
given class of locomotive.
S2 maintenance repairs are required on the train protection system if S1 operational repairs
do not resolve all faults. D3 functional test of the system must be completed if the S1 opera-
tional repairs remedy all faults.
All operational repairs must be documented in the maintenance sheet. The maintenance
sheet template is provided in document 460M.
Record – maintenance sheet:
The maintenance sheet for operational repairs must contain the following details:
§ Date, time and place
§ The serial number of the system and the repaired components
§ The number of the locomotive on which the system is installed
§ The name of the person conducting the operational repairs
§ Description of the faults that have been resolved and their root causes (if known)
§ Description of the faults that could not be resolved by operational repairs
§ The serial numbers of the removed and installed components
§ The signature of the person who conducted the repairs