wizpic
Advanced Member level 3
I've been asked to repair a switch mode battery charger (24V 25A 240V). Not worked on switch mode before
On looking inside I can see that there a 2 components marked on the PCB VAR1,VAR2 which have blown, Luckily there is a bit left which has some writing on it
ZNR V14241U I've tried to find a data sheet on it so I can cross refernce it to get an equivalent part has all the searching has drawn a blank. I've looked on the RS web site at varistors but not sure on which one would do the job, I persume that it would have to be rated above 250V but not sure about amps because they start at 1-100Amp
I persume this is varistor which acts has surge protection ?
I know this may be like asking how long is a peice of string :grin:
What would normally casue these to blow ?
I've checked and looked at the mosfet's in there, the bridge rectifier they all seem good. Is there any good refernce's on switch mode battery chargers out there ?
Thanks
Wizpic
On looking inside I can see that there a 2 components marked on the PCB VAR1,VAR2 which have blown, Luckily there is a bit left which has some writing on it
ZNR V14241U I've tried to find a data sheet on it so I can cross refernce it to get an equivalent part has all the searching has drawn a blank. I've looked on the RS web site at varistors but not sure on which one would do the job, I persume that it would have to be rated above 250V but not sure about amps because they start at 1-100Amp
I persume this is varistor which acts has surge protection ?
I know this may be like asking how long is a peice of string :grin:
What would normally casue these to blow ?
I've checked and looked at the mosfet's in there, the bridge rectifier they all seem good. Is there any good refernce's on switch mode battery chargers out there ?
Thanks
Wizpic