Hi Guys
I was asked to look at a twin extract fan system that was showing a trip fault after checking that both fans ran by temporarily bypassing the fan controller after further investigation I found that a resistor was in serious with a bridge rectifier
The dc side of the rectifier is soldered on to a 48v dc relay.
Now to the question ? it would appear that the resistor is fractured and therefore open circuited it’s either a 2 or 3 watt resistor but here is my problem I can’t measure the resistance as I can’t get a reading there is no other unit to compare it against it has the colour bands so it’s either a 2.2k or 22k resistor I think it’s red red red but the multiplyer band could be orange which would make it 22k ohms
Just wondering if anyone has ever come across something similar and have an idea of the size of resistor.
I have found an old pcb with 2 x 1 kohm resistor and a bridge rectifier if the rectifier is rated above 230v I might build a wee test rig to measure the actual volt drop across the resistor’s but this will be a last resort.
Thanks
dimspark
I was asked to look at a twin extract fan system that was showing a trip fault after checking that both fans ran by temporarily bypassing the fan controller after further investigation I found that a resistor was in serious with a bridge rectifier
The dc side of the rectifier is soldered on to a 48v dc relay.
Now to the question ? it would appear that the resistor is fractured and therefore open circuited it’s either a 2 or 3 watt resistor but here is my problem I can’t measure the resistance as I can’t get a reading there is no other unit to compare it against it has the colour bands so it’s either a 2.2k or 22k resistor I think it’s red red red but the multiplyer band could be orange which would make it 22k ohms
Just wondering if anyone has ever come across something similar and have an idea of the size of resistor.
I have found an old pcb with 2 x 1 kohm resistor and a bridge rectifier if the rectifier is rated above 230v I might build a wee test rig to measure the actual volt drop across the resistor’s but this will be a last resort.
Thanks
dimspark