DC flasher unit

The MA-BL-24/16 DC flasher unit supplies the 24 V DC flashing lights in the signalling equipment of MÁV.

It can replace the earlier thermal flasher, as its load capacity and flashing frequency are suitable, while it also provides several functions that could only be achieved with additional circuits alongside a thermal flasher. The unit can drive any bulb lamp circuit (with or without diodes) as well as LED lamp circuits.

The unit generates two alternately flashing outputs from the 24 V voltage connected to its input. It also contains the drive circuit of the flash monitoring relay and a pulsed switch – galvanically isolated from the 24 V circuits – that can be used for indication purposes. It is made in two configurations: 1. for driving an XJ monitoring relay only; 2. for driving either an XJ or a Hengstler monitoring relay – this configuration has a monitoring circuit with higher output power.

The flasher is built into a unit matching the design and dimensions of the D55 double-width rack unit.

Advantages

• input voltage monitoring circuit included
• the power outputs can be significantly overloaded
• apart from the clock and voltage monitoring circuits, the two flashing channels are completely independent of each other
• overload protection
• fail-safe monitoring circuit
• suitable for both filament bulb and LED lamp circuits

References

• 500 units in operation in the level crossing protection systems of MÁV and GySEV