MIREL VZ1, Maintenance And Diagnostics Manual, Page: 10 / 33

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6 System Diagnostics
Four levels of MIREL VZ1 train protection system diagnostics
D1 Start-up diagnostic control
D2 Continuous diagnostic control
D3 Functional test
D4 Prophylactic control
The first two levels (D1 and D2) are conducted automatically by the system itself. If a fault is
detected, the operator is notified of such fact and the system is placed into safe mode. Ac-
tions are taken to lock out the system if the discovered fault prevents subsequent operation
of the train protection system. System operational repairs (S1) must be conducted when a
fault is detected.
A functional test (D3) is conducted by the operator's trained personnel. The functional test
checks the overall functionality of the system, meaning the functionality of all indicators and
keypads, the functionality of all input and output circuits and cooperation with other equip-
ment on the locomotive (including driving controls, EPV, incremental RPM sensor, pressure
sensor, etc.). System operational repairs (S1) must be conducted when a fault is detected.
Prophylactic control (D4) of the system is performed periodically by the manufacturer of the
train protection system or by other trained persons. In addition to performing the functional
test, an in-depth control of the entire system is conducted (measuring input code filters,
reading internal variables of the train protection system, checking input/output circuits and
checking the devices that work in conjunction with the train protection system). This check is
conducted to check the complete functionality of the equipment and for any wear and tear.
Operational repairs (S1) or maintenance repairs (S2) are required depending on any faults
that may be detected.
Anyone conducting diagnostics of 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 diag-
nostics.