MIREL VZ1, Maintenance And Diagnostics Manual, Page: 16 / 33

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not consistent with the configured permissions (prohibited for the given configuration) and
the error code is
E28 .
Communication functionality test – each unit continuously monitors the functionality of
data communication on the RS485 link. The system reports a communication fault if the
PMC processor module or any signal repeater module does not receive the correct data
packet from the PMM module after more than 5 seconds. The system also reports a com-
munication fault if the PMM processor module does not receive the correct response packet
from any other module after 50 attempts. The system detects one of the following error
codes:
E04, E05, E06, E03, E50, E51 or E00 . If a MIREL STB functional gateway is detect-
ed during the start-up of the system, the train protection system checks the functionality of
communication with the functional gateway during system operation. A loss of channel M
communication with the MIREL STB functional gateway is considered a fault and the error
code is
E80 . A loss of channel C communication with the MIREL STB functional gateway is
considered a fault and the error code is E81 . Should a MIREL SHPE cooperating device be
enabled in the system by the configuration, the train protection checks the functionality of
their communication during entire further system operation. In case of communication loss
between MIREL SHPE device and M-channel, the system detects and indicates error
E85 .
In case of communication loss between MIREL SHPE device and C-channel, the system
detects and indicates error
E86 .
Train protection system intervention integrity test – the system continuously compares
the results of channels M and C of the central unit with a frequency of 10 Hz. A fault is de-
tected if there is a difference in results when monitoring train protection system intervention
for longer than 5 seconds and the error code is
E10 .
Maximum permitted speed evaluation integrity test – the system continuously compares
the results of channels M and C of the central unit with a frequency of 10 Hz. A fault is de-
tected if the difference in speed exceeds 5 km.h
-1
when evaluating maximum permitted
speed for longer than 180 seconds and the error code is E14 .
Signal sign transmission integrity test – the system continuously compares the results of
channels M and C of the central unit with a frequency of 10 Hz. A fault is detected if the dif-
ference in the results when decoding transmitted signal signs or speed orders exists for
longer than 20 seconds and the error code is
E15 .
Speed measurement test – speed measurements are completed using the four-channel
incremental RPM sensor. Actual instantaneous speed is calculated from measurement
channels 1, 2 and 3 and 4 in both evaluation channels (M and C). The calculated speeds are
compared and every evaluation channel works with the higher of the two calculated speeds.
A fault is detected if the difference between the measured speeds is larger than 20 pulses
from the sensor and the error code is
E20 . The mutual comparison of results in both evalua-
tion channels continues. A fault is detected if the difference in the speeds measured by
channels M and C is greater than 2 km.h
-1
for more than 10 seconds and the error code is
E25 .
Pressure measurement test – the pressure sensor in the main brake pipe is connected to
the system by a 4-20 mA current circuit. The system continuously tests the upper and lower
limits. A fault is detected if the limit values are exceeded and the error code is
E24 . The mu-
tual comparison of results in both evaluation channels continues. A fault is detected if the
difference in the pressure measured by channels M and C is greater than 0.2 bar for more
than 20 seconds and the error code is
E26 . The final main brake pipe pressure test checks
for conformity between pressure and the movement of the locomotive. A fault is detected if
pressure in the main brake pipe is less than 0.5 bar and the locomotive accelerates to more
than 10 km/h and the error code is
E12 .