Can the fan be turned off on the power supply for the quantar or does it have to run all the time.? If unplugged will this cause harm?
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Quantar power supply fans.
- Thread starter P25Radio
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Sorry Will lost on llrc and AKASKA?
There are several models of Quantar power supplies and some are made by Motorola and others by Onan. The only fix I can think of is drill out the case rivets and place a resistor in series with the fan leads. You will have to experiment with the value but I've done this many times in other equipment and have found the point where fan noise is almost inaudible but they still move plenty of air. The resistor value for a 12V muffin fan ends up close to 100 ohms and a 2 watt resistor is fine. Not sure what voltage the Quantar fans are.
Sorry that you ARE lost:.
IIRC if I remember correctly.
AKASKA Akasa fan AK-174BKT-B PC cooling fan. Auto speed control with temperature sensor.
Just replaced the OME power supply with one from Onan. WOW it is so silent I have to check to see if the machine is still on. Very pleased so far and the power supply fans have not come on yet.
Be careful with the Onan PS. They were the original supplies for the Quantar. They have issues with dust blowing them up. We were very careful just walking by them. One time a new tech saw the dust on the front grill and grabbed a can of air to clean them up. After cleaning the 5th PS and all of them blowing up, he figured something was up. Mot had a revision that added a plastic cover over most of the front grill to mitigate the problem. The Mot PS is an improvement. In older Quantar firmware the fans would run intermittently as needed. By the last 6 or so versions they changed the PS fan op to run continuously. A Quantar PA will run forever if it is continuously in use (Control Channel), but heating them up and cooling off will cause intermittent failures due to solder issues on the ceramic chip caps. Mot figured tightening the temp variation would reduce failures. PAs & power supplies are the biggest failure items for the Quantar.
Interesting, so far no issues it is warm at the moment, about 80 degrees. will see later on tonight. the dam Motorola supply ran 24-7
I had an Onan that blew up. Replaced it with a newer unit and haven’t had a meltdown yet.
Ubbe
Member
Be sure to clean any dust off the cooling fins. The dust will work as an isolator to air and the module will overheat. There's a reson to why computers have dustfilters and it's just a bad design that Quantars have no filters at all. Even in a room that had air filters on all fans to the room it still picked up dust in the Quantars.
If you do quartlerly site visits, then bring the spare PA and PS and swap in one Quantar and take home and clean properly with high preassure compressed air and a brush if that is possible. Then take the next Quantar at your next visit.
/Ubbe
If you do quartlerly site visits, then bring the spare PA and PS and swap in one Quantar and take home and clean properly with high preassure compressed air and a brush if that is possible. Then take the next Quantar at your next visit.
/Ubbe
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