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DK-Technologies PT 5211
VariTime™ Change Over Unit

• Very high reliability, MTBF 80.000 hrs.
• Indicates status of both primary and back-up generator.
• Switches: analogue video, serial digital video and digital audio (balanced and unbalanced signals).
• Basic version four channels, expandable up to 12 channels.
• All unbalanced channels may be used for all types of signals.
• Free choice of generator as primary or back-up SPG.
• Configurations compatible with PT5210 VariTime Digital Sync Generator.
• Error detection and indication on both primary and back-up SPG.
• Local and remote status indication.
• Preset of automatic or manual selection of primary or back-up SPG.
• Local and remote manual operation.
• Continues operation with the selected SPG in case of power failure on the change over unit

DK-Technologies PT5211 Shown

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The PT5210 VariTime Digital Sync Generator and PT5300HD-SD Vari-Time™ both have an independent circuit for monitoring the signal quality on the outputs. A choice of outputs to be monitored is possible. Errors (too low levels or no transitions) will cause an alarm signal. This is used in the PT5211 VariTime Changeover unit to switch to the stand-by SPG. By monitoring both the master and the stand-by SPG, the system reliability is increased. Since the change-over unit relies on alarm signals from the SPGs, the complexity of the unit itself is reduced and thereby not only its own but also the total system reliability is improved.

The PT5211 VariTime Changeover unit automatically switches serial digital video, composite video, composite black burst, AES3 digital audio and LTC signals between the primary and the back-up generator.

The changeover unit can be modified to fit the exact configuration of the SPGs used in connection with the changeover unit. The switching is done by means of relays with all channels switched simultaneously. The use of latching relays ensure that the SPG selection remains unchanged in case of power failure on the changeover unit. Front panel control is provided to select which generator is to be the primary one (operating mode manual or automatic). The front panel is secured against accidental changes by including a "Hold to Modify" button which must be pressed simultaneously with any other button.

Remote control is facilitated by a parallel remote interface. For emergency situations the remote can always be overruled by the front panel controls.

A simple relay contact in the remote connector may be used to connect an external warning circuit. The contact is open during normal operation and closes during failure. This relay may be used to activate an external alarm in the event of a failure - even in case of missing power to the changeover system.