MIREL VZ1, Maintenance And Diagnostics Manual, Page: 11 / 33

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6.1 D1 – Start-up Diagnostic Control
Purpose:
This control verifies the status, integrity and functionality of the system during start-up. D1
serves as a daily test if the system is continuously in operation for more than 24 hours.
Execution:
The train protection system automatically executes this control without intervention.
Schedule:
Every time the MIREL VZ1 train protection system is switched on with the control repeated
after 24 hours of continuous operation of the system.
Description:
D1 start-up diagnostic control is executed once the system is switched on and diagnoses the
functionality of communication inside the central unit, communication between the central
unit and signal repeaters, the circuit for signals transmitted from track infrastructure to the
on-board equipment, control elements in the engineer's cab and the emergency brake EPV.
D1 start-up diagnostic control is executed every time the system is placed into service and
once every 24 hours (daily test) if the system is operated continuously. D1 start-up diagnos-
tic control is executed automatically without intervention on the part of the operator. The
control is repeated after the following conditions are met:
§ Control is automatically repeated the first time the locomotive stops after 24 hours have
passed since the last time the D1 diagnostic control was last completed
§ If the locomotive does not reach a speed of zero within 24 to 48 hours of the most recent
D1 diagnostic control, the D1 control cannot be repeated and the system detects a fault
§ D1 start-up diagnostic control is blocked when the system is operating using EVM speci-
fications in MEN working regime and a speed order of 0 is transmitted until a different
speed order is transmitted
§ The operator is notified 15 seconds in advance of a repeated D1 start-up diagnostic con-
trol by a blinking D1 code on the signal repeater and acoustic signal ZS10. During this in-
terval, the operator may press the button to delay the repeat of the D1 start-up diag-
nostic control for another 15 minutes. If the button is not pressed, the D1 start-up
diagnostic control is automatically started and the control must be completed in full.
The D1 start-up diagnostic control includes check of the circuits for the transmission of sig-
nals from track infrastructure to the on-board equipment of the train protection system.
When executing this portion of the D1 start-up diagnostic control, the transmission of infor-
mation from track infrastructure is not active, even if the system is in working regime. The
time to check the circuits for signal transmission from track infrastructure is approximately 90
seconds from the start of the D1 control.
The D1 start-up diagnostic control includes a check of the functionality of the EPV on the
emergency brake valve. The system activates the opening of the emergency brake EPV two
times, which results in two brief drops in air pressure in the main brake pipe. Prerequisites
for completing the emergency brake EPV functionality check are completion of the control
switch test, switching the control switch in the active cab, releasing the locomotive's direct
acting pneumatic brake and the system may not be stand-by regime.
D1 start-up diagnostic control includes diagnostics of the input signals from cab controls.
The operator is forced to manipulate the controls as notified by four short acoustic signals
and the
D1 code on both signal repeaters. If the operator does not perform the defined ac-