MIREL VZ1, Maintenance And Diagnostics Manual, Page: 13 / 33

154VZ1 : 190111
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not initiate communication with MIREL STB in subsequent operation and works inde-
pendently.
If train protection system diagnostics detect a system fault (with the exception of a commu-
nication fault with the signal repeater in the inactive cab), the system is placed into safe
mode and signal repeater displays NO11 in both cabs display
ERR . The system is placed
into safe mode by activating both output channels to control the EPV.
List of tests conducted within start-up diagnostic control:
Program integrity check – the system calculates the checksums in memory containing the
saved programs and compares them to the expected values. Memory fault error codes are:
E03, E40, E42, E43, E44, E45 or E46 . The system is not functional during this test.
Program parameter integrity check – the system calculates the checksums in memory
containing the saved program parameters and compares them to the expected values.
Memory fault error codes are:
E02 or E03 . The system is not functional during this test.
Processor working register functionality check – a read and write test for all bit combina-
tions of data in all registers of all processors. The error code for this fault is: E41.
RAM functionality check – a read and write test for all bit combinations of data in all
memory cells of all processors. The error code for this fault is: E41.
Communication check between PMM processor modules and the PMC central unit –
the PMM processor module sends a SYNC packet to initiate communication with the PMC
processor module. If communication is not initiated within 5 seconds, the error code is:
E34 .
The system is functional during this test.
Communication check between the central unit and the signal repeaters – the PMM
processor module of the central unit sends a SYNC packet to initiate communication with
the signal repeaters. If communication is not initiated with the active station within 5 sec-
onds, the error code is
E04 or E05 . The system is functional during this test.
Check of transmission routes to monitor information from track infrastructure – the
system tests transmission filters, the connections of sensors and the sensors themselves in
both transmission channels. The test involves 24 steps. A progression of combinations of
the following parameters is defined:
Transmission channel: M, C
Carrier frequency: 50 Hz, 75 Hz
Transmission route from cab: ST1, ST2
Signal intensity: low, moderate, high
The full scope of the transmission route test is only conducted in the full scale if the locomo-
tive is standing in a section of track where there is no signal sign transmission. If the system
detects a 50 Hz or 75 Hz carrier frequency in the track circuit, this step of the test is skipped.
The error code is:
E07 .
The system is functional during this test. There is no transmission of information from the
track infrastructure if the system is switched into PRE or MEN working regime during the
execution of the transmission route check.
Emergency brake EPV functionality check – the system executes a check of EPV control
using both channels. The test is performed in two steps. The EPV is opened briefly when the
locomotive's brake is first released, first using channel M and then channel C. The system
evaluates the drop in pressure in the main pipe and compares it to the expected values. The
error code:
E08 . The system is functional during this test.