EPIS 5.0A bus installation training

On 19.12.2019, a training session for technicians was held to familiarize them with the procedure of installation of the new EPIS 5.0A on-board system in buses operating within the JMK IDS. The training session started with the way the EPIS 5.0A on-board computer assembly is designed, including its basic parameters.

Principal wiring

The basic parameters are shown in the following figure - it is basically a replacement of MSP from version 3D2 or MSP 5.0. The unit connects directly to the vehicle batteries via an independent fuse. The minimum recommended vehicle OIS system protection shall be (minimum currents):

• 15A for vehicles containing only DOT-LED panels
• 20A for vehicles containing DOT-LED panels and LCD display
• 25A or more for vehicles containing only LED panels and LCD display

The HS (HS - main switch) current output for the OIS +24V (OIS - check-in and information system) power supply can draw a continuous current of up to 30A unless the SW is set to a different value in the EPI. The cross sections of the incoming and outgoing wires must be sized for these currents.

Since the EPP 5.0A clearance unit is sensitive to the input power supply, it is recommended to use a 2.5 mm2 conductor (minimum 1.5 mm2) for the input power supply.

The outgoing HS (or PS) wire must be of a cross section according to vehicle standards.

Simplified wiring principle of the EPIS 5.0A on-board computer with regard to internal wiring.

The EPIS unit connects directly to the vehicle power supply - via the fuse directly to the battery. When the "start" button is pressed, a constant voltage of +24V is applied from the key switch to the "start" input of the unit, thus switching it on. When the key switch is switched off, the unit will hold the "start" command for the necessary short time to perform the necessary actions. These actions include sending payments and correctly shutting down the operating system. After this time, the unit disconnects itself from the vehicle power supply. This time is SW configurable (see SW function description).

In the event of a sudden voltage drop or failure, the unit will switch to power from the internal battery backup for the time necessary to perform the above (or other) necessary actions.

Wiring diagram of the KORDIS JMK vehicle based on EPIS 5.0A

The wiring of the unit for connection to the vehicle is designed to be based on the existing wiring of the MSP units. The colour marking of the power wires is based on the practical experience of the EPIS manufacturer and is recommended to be followed throughout the entire JMK ITS.

Block diagram of the OIS system wiring with EPIS 5.0A on-board computer in the vehicle for Kordis JMK.

Basic description of public transport vehicle wiring within the JMK ITS:

• On-board computer with check-in EPIS 5.0A1 in the equipment of the control unit EPC 5.0A1, check-in unit EPP 5.0A, driver's touch LCD terminal EPT 5.10A and external switch EPI 5.0A1 (simplified power supply unit IJN 30). External switch EPI switches standard voltage +24V to the power supply output HS (main switch) and on request also to the power supply output PS (auxiliary switch).
• Common GNSS (Global Navigation Satellite Systems) and GSM/LTE antenna. This combined antenna is placed on the roof of the vehicle (bus) for better satellite reception for vehicle positioning and also for better communication via GSM/LTE. For this purpose, the combined antennas are supplied with a high quality cable for GSM/LTE reception (very low attenuation).
• Since the EPIS 5.0A on-board computer is permanently energized directly from the vehicle batteries (even though it is in stand-by mode), this OIS (check-in and information system) wiring must be fused with a separate fuse. The maximum power consumption is determined by the power consumption of the EPIS 5.0A on-board computer and other components connected to the HS power output (boards, markers, LCD, command receiver, ...).
• A docking connector on the base of the on-board computer ("money drawer") allows easy replacement of the EPC and EPT control unit and, as standard, the EPP. The standard EPIS 5.0A - KEP 5A-01/xx connection cable is routed from this connector, where xx is the cable length in decimetres. If the vehicle contains an acoustic system for playing a radio or other sound source, additional outputs and a switching relay must be used - cable KEP 5A-02/xx (diagram to be added).
• The external loudspeaker of the vehicle is located above or below the first door of the vehicle - it is activated either by a command receiver for the announcement of the destination stop for the blind or by the on-board computer if there is "any" exception on the route as a warning to passengers (e.g. route closure,....).
• Internal acoustic wiring for standard announcements to passengers from a digital annunciator, driver or dispatcher. Can be connected via switching relay (see below).
• IBIS hub - a junction box in the vehicle to be used as a distributor for the IBIS bus and the HS power supply. Depending on the number of components connected to this bus, 1-3 hubs should be used in the vehicle. It can also be solved by using WAGO terminals.
• Vehicle front board (direction indicator) showing in green the line number and the destination station with dimensions of at least 19 x 144 dots (e.g. VLP 19×144 GI).
• A vehicle side board (direction indicator) displaying the line number, destination station and intermediate stops or other additional information in green with minimum dimensions of 19 x 112 dots (e.g. VLP 19×112 GI).
• The rear vehicle board (number) shall display the line number in green with minimum dimensions of 19 x 32 dots (e.g. VLP 19×32 GI).
• Internal LED passenger information board with minimum dimensions of 10 x 120 dots in red (e.g. VLP 10×120 RI or VLP 20×120 RI).
• Time and zone board - this can also be provided by an internal LED or LCD passenger board (e.g. VLP 12×64).
• Blind signal receiver with increased selectivity (e.g. EPNEV 3.14 or EPNEV 3.24)
• Ticket marker usually located at the first door and now standard on the IBIS bus - e.g. ETM 4.0
• Single-bit inputs to the on-board computer providing basic system functions:
  • START - switches the on-board computer from a "stand by" state to an active state by applying +24V from the vehicle key. The system is deactivated by turning off the key and then after the driver logs off.
  • Emergency button - sends an "alarm" message to the dispatcher regarding a vehicle emergency and in particular the driver (the button can be hidden in the driver's cab).
  • First door and next door - feeds the door status to PP for subsequent evaluation of vehicle behavior statistics. In case the inputs are not connected to the door lights but to the signals from the "MUX" units, it is usually necessary to connect auxiliary resistors between the input and the vehicle ground to reduce the voltage. The resistors used are from 560 Ohm and above depending on the vehicle wiring.
• Internal LCD for passengers (e.g. VCS 185 or other types)

General about the connection

A description of the EPIS 5.0A system connections to the vehicle as shown in Figure 2, i.e. power, IBIS bus, Ethernet, and single-bit inputs and acoustic outputs. The KEP cable is part of the docking connector and the leads are not terminated on the other side (this is done when the system is installed or can be ordered)

The terminal block items, W1 and W2, can be included in the installation package as a delivery over and above the delivery of the EPIS 5.0Ax system.

Manufacturer's recommendations

Power supply terminal block

is designed to connect the system to the power supply system

Connector W1

is designed for connection of single-bit I/O and vehicle speakers

• Connector - EPIS side 5: WAGO 734-208
• Connector - vehicle side: WAGO 734-338

Connector W2

is designed to connect the IBIS bus

• side from EPIS 5: WAGO 734-205
• vehicle side: WAGO 734-33

UTP for LCD connection

without connector: - UTP cable for connection of vehicle LCD