Multi-channel safety code transmitter

The equipment generates and monitors the coded 75 Hz supply voltages used to feed track circuits and radiating cables.

In its full configuration it generates all codes used by the Hungarian railways. It continuously checks the codes sent to the track and the correctness of the coding, and regularly tests its own circuits. Its design has been proven to meet the safety requirements. If codes are mixed up or a failure occurs, the equipment switches to emergency mode, which allows traffic to continue with reduced but safe speed aspects – keeping disruption to a minimum. The operator can initiate a check of whether the mixing of codes (on the track or in the interlocking) has ended and whether normal operation can be restored. If the check finds everything in order, the equipment returns to normal operation.

It is supplied in a wall-mounted cabinet, so it can easily be added to interlockings that are already in operation.

15 units have been installed so far.

Technical data

• Input voltage: 230 V AC, 75 Hz
• Supply voltage: 48 V DC nominal (42–56 V DC)
• Output voltage: 230 V AC, 75 Hz, coded
• Code types: 1A, 1B, 1X, 2, 3, 4, 4* (X with a separate card)
• Load capacity: max. 4 A per code, max. 6 A in total