Services
Over 25 years experience in Design, Installation, Maintenance, Repair, Testing and Commissioning of Railway Signalling Equipment from ancient to modern
WDMDL Signalling Ltd currently provides Testing and Commissioning services at a Mod 3B/4 level with a bias towards Level Crossings.
Recognising the commercial demands for shorter commissioning timescales and increased reliability, WDMDL Signalling Ltd has developed a range of Test Equipment to help achieve these goals:
Level Crossing Barrier Machine Simulator (BR843 Mk.2)
This device simulates a pair of barrier machines. It is simply connected up to the outgoing links for the relevant machines, from where it also draws its power.
Depending upon the barrier position (determined by the motor and solenoid valve controls applied), the device will simulate the making and breaking of the circuit controller bands.
An LED display indicates the simulated barrier boom angles, allowing easy verification of the results of test stimulus.
Function buttons allow each barrier to be halted mid-travel (to aid testing failure timers) and also to configure for the blue ABCL power pack variant.
Normally only one simulator would be required per crossing as the barriers are controlled in pairs, however two would be required where BPM is specified.
MCB-OD Radar Simulator (Honeywell YD136)
This device simulates a Primary Obstacle Detector. It is simply connected up to the outgoing links for the radar, from where it also draws its power.
Depending upon the control inputs, the device will simulate the operation timing and sequence of the radar unit's internal relays.
A function button allows the simulation of an obstacle during the time the unit is active but has not received a STOP input.
An LED display indicates the current status, allowing easy verification of the results of test stimulus.
MCB-OD Reliability Test Sequencer (Standalone MCB-OD REB)
This device simulates the Signaller and Interlocking. It is connected up to some of the incoming and outgoing circuits and additionally requires a power supply.
Both manual and automated modes of Level Crossing Control are exercised in a 1:10 ratio up to a maximum cycle of 1000 automated operations.
The device will halt upon any failure and when used in conjunction with the data logger, the data can easily be reviewed to determine the cause.
An LED display indicates the current mode and counter, allowing easy observation of test progress.
The device may also be connected to MCB-OD REBs with local signal interlocking, however many of the connections will be to relays rather than cable links.
MCB-OD LIDAR beam height setup aid
Used in place of the target boards and LAC-1 units, these devices (used in an array of 3 or 4) can reduce the beam alignment time from hours to minutes as the person adjusting the Redscan unit can instantly see the effect of their adjustment at the target points.
A clearly visible 100mm-high 3-digit orange LED display shows the height of the bottom of the beam when in Low Level mode and alternates between the top and bottom of the beam when used in High Level mode.
The devices are powered by three "AA" Cells. Rechargeables are preferred but Alkaline can also be used.
Portable Testing Supply
A handy piece of kit to carry around in your bag, this device allows you to function test circuits where connection to a suitable local supply is not possible.
Powered by four "AA" NiMH Cells, the device is suitable for TRs (20 Ohm), 24V and 50V relays.
Using high quality components, efficiency ranges from 75% to 90% over the load range of up to six 24V or 50V relays
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