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6.4 D4 – Prophylactic Control
Purpose:
This control involves the in-depth verification of the status, integrity and functionality of the
system with respect to safety and reliability and verification of the status and interface be-
tween the system and the locomotive. It includes conducting D3 functional testing.
Execution:
Manufacturer-trained personnel or other persons demonstrably authorised and trained by
the manufacturer explicitly for this purpose.
Schedule:
In case that the previous D4 prophylactic control was performed in the Basic range, the fol-
lowing D4 prophylactic control is performed after 24 months with a tolerance of 2 months.
If the previous D4 prophylactic control was performed in the Extended range, the following
D4 prophylactic control is performed during the major repair of locomotive. In specific cases,
if the periodicity of the major locomotive repairs exceeds 10 years, the prophylactic D4 con-
trol must be carried out no later than 120 months.
The first deadline for a D4 prophylactic control commences on the date of the final check
conducted during the removal of the central unit and the signal repeaters of the MIREL VZ1
train protection system from the manufacturer's warehouse. If these components are not
removed from stock simultaneously, the deadline begins on the earliest of these dates.
Commissioning, or recommissioning of all components out of service for more than 12
months, must occur if the entire system, its central unit or any MIREL VZ1 train protection
system signal repeater is out of service for more than 12 months. Commissioning must be
conducted in the scope corresponding to assembly level Z2 at a minimum. The term "out of
service" means that the central unit or the signal repeater is not installed on the locomotive
or in a test situation or is installed but the system is not powered up over such period of
time.
The new interval commences if an unplanned D4 prophylactic control is performed.
If D4 prophylactic control is not completed in full within a single service stop or at different
time intervals on the central unit, signal repeaters as well as system interaction with the lo-
comotive, then the new interval for D4 prophylactic control begins on the day on which the
first portion of the D4 control was conducted.
Place of inspection:
Prophylactic inspection D4 of the MIREL VZ1 system can be carried out in one of ways as
shown below:
§
on drive railway vehicle (DRV)
§
Prophylactic device inspection shall be carried out in the Producer´s service centre. The
prophylactic inspection of system cooperation with DRV shall be carried out on DRV.
Device assembly and –disassembly doesn´t form an integral part of the D4 prophylactic
inspection
Description:
The execution of D4 prophylactic control is subject to the provisions of a specific internal
procedure issued by the manufacturer for in-depth checks of the system. The methodology
for performing the D4 prophylactic control is adapted to the different installation conditions
for individual classes of locomotives on which the MIREL RM1 VZ1 train protection system
Summary of Contents for VZ1
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