L5508RVF Puzzle

I have an 8 channel relay that is readable and scannable via toolkit and can be saved back to the database and network. Good mains voltage is present at the relay and the c-bus voltage via toolkit and ping is 27.4v BUT the unit and c-bus lights are not on and the unit will not respond to either to local toggle or commands over the network. Last night it turned on some outdoor flood lights some time around 3.00am and the only way I could turn them off was to turn off the circuit breaker to the floods.

I have a DLT that receives its c-bus cabling from this unit and that works fine so the 'pass-thru' in the unit it ok.

Although there is mains power to the unit the status tab says no lines/mains present and the local Toggle Active light is also off despite the Enable Local Toggle option being checked on the Global tab.

What would cause a unit to have no unit or c-bus lights on but still allow the unit to be scanned and edited, not show line/mains present when it is and not show local toggle active when it is checked?

Hoping to avoid an ~$800 replacement. Any ideas greatly appreciated...

 

If all these issues occur simultaneously then there is an issue with either the power feed to the unit or the unit's internal power supply.

If both the Unit and C-bus LEDs are off then the unit is not getting power for some reason. Under this condition the relays cannot be operated.

Internally the unit has 2 power supplies. It can take power from either the mains input or from C-Bus. The C-Bus power supply allows the unit to be configured without the need to power the unit from mains. This is very handy for those who like to pre-program the units on the bench and then deliver them to site already programmed. The C-Bus power supply only provides enough power to scan and program the unit over C-Bus. It does not provide enough power to drive the relays, light up the indicators, take local toggle inputs, etc.

I would take a look at the power connection to the unit. It's possible that there's a break or a badly terminated wire there somewhere.

Clipsal do repair units too. Contact your sales rep, fill out the form and Clipsal will take a look at it. You'll either get a quote for repair or notification that the unit is beyond economic repair.

 

Thanks Newman. There is definitely 240v at the contacts on the unit so it sounds like the internal power supply.