RUT955 Activating DIN1 with relay: Difference between revisions
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When connecting external diode make sure you connect it as close to Relay's coil contacts as possible. | When connecting external diode make sure you connect it as close to Relay's coil contacts as possible. | ||
[[Category:RUT955 Hardware Application Examples]] | |||
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<b><sup>1</sup></b> this scenario is possible1 when RUT955 power supply uses the same ground as Relay Control signal. | |||
Revision as of 11:17, 12 March 2021
Main Page > EOL Products > RUT955 > RUT955 Hardware Application Examples > RUT955 Activating DIN1 with relayThis section will provide example how to safely use an external Relay for RUT955 DIN1 (passive/dry) control, when using Common ground:
Unlike other RUT955 inputs, DIN1 is a passive type and to change its state, pins 1 and 6 must be shorted. This can be done with push button, reed switch or a Relay.
When using the Relay for input control, one must have in mind, that after Relay deactivation (switching from NO to NC) the COIL still holds energy and can cause high voltage spikes which can, through common ground1, damage router DIN1 input electronics.
To avoid this situation always use relays with integrated flyback back diodes or if one is not available, connect External diode parallel to coil contacts in reverse polarity as in picture above.
When connecting external diode make sure you connect it as close to Relay's coil contacts as possible.
1 this scenario is possible1 when RUT955 power supply uses the same ground as Relay Control signal.