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Requirements to the Barrier - Boom - Widths up to 6,5 m - Automatic opening in case of power failure - Barrier boom in glass fiber reinforced plastic - Reflex foil like the railway barrier - Connection of the earth potential of the tram to the barrier housing - Drive of the barrier from the signalling equipment - Potential free indication OPEN / CLOSED - Monitoring loop under the barrier boom - Fault message from the barrier  Realization of the Requirements - MTS 6 barriers with 6 sec. running time - Equipped with the complete spring - package for the automatic opening in case of power failure - Plan has been changed later, according request of the customer, because also during voltage loss, the road must be blocked Barrier boom - Special version - Starting from shaft to 2,5 m: 8 edge alu profile - Maximum 4 m glass fiber reinforced round boom, diameter 70 mm  Earth potential of the Railway - Earth from the power supply only connected to the MUB control unit - Complete barrier housing is on the earth potential of the railway - Separation of the potentials via isolation of the motor winding - Sheet metal parts must be fastened with screws to the housing - Flanged shaft must be grounded Control unit - MUB 3A-173 with auto reset mode 4 - Fault message, when 24 V driving voltage is missing of the control unit MUB - Indication OPEN / CLOSED via limit switch on the flanged shaft - MID for the safety loop Advantages with Barrier - Solution - Traffic regulation is more secure than only with a signalling equipment - Cheaper than a subway - Magnetic barriers are cheaper than the standard Federal Railway barrier   
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