pulsar dimmer

[marque51]

hi all

I,ve been asked to resurect some ancient dimmers at my daughters school. they are a very old pulsar 6 channel 2kw pack. the question I have is; each 2kw channel requires 2 x 5a fuses, (which I have replaced and all seems to work) but how does that work? what do the two fuses do? and are 5amp fuses sufficient for 2kw.

thanks marque

[Brian]

There are indeed two fuses in parallel. The problem is that 10A fuses and holder rated for continuous and reliable operation were, and still are, a rare commodity. Pulsar's solution was to use two together.

[marque51]

Thanx Brian

they are all up and running now, but it still doesn't make sense to me. probably having a blonde moment.

2 fuses in parallel would make a total of 10amps but is it safe? and if they're in parallel how come it needs both fuses to get any output.

I have looked online for wiring diagrams and a manual but can't find anything.

[Jivemaster]

Please also consider that old dimmers needed fast fuses. A normal or antisurge/slo blow will fail long after the semiconductor.

See if a F,FF or FFF rated fuse was originally specc'd. Only a fast enough fuse will protect the semiconductor.

[marque51]

Please also consider that old dimmers needed fast fuses. A normal or antisurge/slo blow will fail long after the semiconductor.

See if a F,FF or FFF rated fuse was originally specc'd. Only a fast enough fuse will protect the semiconductor.

 

 

thanx thats a good point that I hadn't thought of