MIREL VZ1, Maintenance And Diagnostics Manual, Page: 17 / 33

154VZ1 : 190111
17 / 33
Actual direction of travel evaluation test – the conformity of direction of travel measure-
ments are checked in the same way as speed measurements. The error code is E21 if the
evaluated directions do not match for a period of 3 seconds.
EPV check during train protection system intervention – the EPV valve is opened using
channel M if train protection system intervention is activated. The decrease in pressure in
the main pipe is then measured and compared to the expected values. EPV opening is acti-
vated using channel C and if there is low pressure in the main pipe, a fault is detected and
the error code is
E11 . The expected pressure drop values are pressure of less than 4.5 bar
within 5 seconds and pressure of less than 3.5 bar within 10 seconds.
Incremental RPM sensor power test – the system uses a comparator to test the power to
the incremental RPM sensor. A fault is detected if the current draw is too low (power loss) or
too high (short circuit) and the error code is
E22 .
Main pipe pressure sensor power test – the system uses a window comparator to test the
pressure sensor supply voltage. A fault is detected if voltage is too low or too high and the
error code is
E23 .
Test of decoding and processor execution of instructions – the proper decoding and
executing of the applied sub-set of the instruction file of processes is tested by triggering a
special diagnostic part of the program, which is conducted cyclically in 4 branches with a
comparison of results. A period of 100 ms is required to conduct a single cycle. The testing
period for all input data bit combinations is 26 s. A fault is detected in decoding and execut-
ing instructions and the error code is
E30 .
D1 start-up self-diagnostic control completion test – an error is detected if the complete
scope of D1 control is not completed within 4 hours from the moment the train protection
system is switched on and the error code is
E09 .
D1 start-up self-diagnostic control restart test – an error is reported if the system is una-
ble to restart D1 start-up self-diagnostic control within 24 to 28 hours of the most recent test
(if the locomotive has not stopped completely) and the error code is
E32 .
Signal sign indicator test – information from the signal repeater indication and control
module is compared in the PMM and PMC processor modules of the central unit to detect
any nonconformity between the indicated signal sign and the blue light. The error code is
E52 .
Signal repeater button test – information from the signal repeater indication and control
module is compared in the PMM and PMC processor modules of the central unit to detect
any fault in the signal repeater buttons. The error code for a button fault is E53 . The error
code for a button fault is E54 . The error code for a button fault is E55 . The system
detects an unprompted intervention if the confirmation button on the signal repeater is
improperly operated and the error code is E56 .
MIREL STB functional gateway fault detection – detection is conducted autonomously of
the actual functional gateway. The train protection system displays applicable error codes in
the range from
E60 to E75 .
Error detection of MIREL SHPE device – detection is carried out autonomously by device
proper. Train protection realizes the indication of respective error code in range from
E90 to
E98 .
Configuration parameter integrity check – the system calculates the checksums in
memory containing the configuration parameters and compares them to the expected val-
ues. The error code for a memory fault is
E33 . Evaluation channels M and C in the central
unit mutually compare configuration chains. A fault is detected if the configuration chains are