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Electronic Theatre Controls Inc

Why Are My R20 Relays Chattering or Not Firing?

If your R20 relay modules are chattering or not firing in your Sensor Classic, Sensor+, Sensor3 or Unison DR/DRd rack there may be a problem with the neutral wire on your signal distro card. This problem can also cause ELV10 modules to not work correctly in test mode in Sensor+ racks. Make sure that the neutral wire, pictured below, is both soldered to the PCB and connected to the neutral bus in the rack. For information on neutral reference wires in Legacy Unison DR racks, click here.


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