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Author Topic: Time required for heater platform to reach temperature  (Read 404 times)

Herb

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Time required for heater platform to reach temperature
« on: September 03, 2013, 07:22:27 PM »
It takes a long time (about 45 minutes) for my heater bed to reach 110C:

0:0023.2
5:0060.0
10:0082.1
15:0094.1
20:00100.5
25:00104.4
30:00106.7
35:00108.5
40:00109.5
45:00110.0

Once it reaches temperature, I am able to print, but I hate having to wait so long for things to warm up.

I suspected that my power supply might not have been putting out sufficient voltage, so I measured it. Open circuit, I am only getting 10.67 V DC, and under load, I am only getting 10.45 V DC. This is with the voltage adjustment at its maximum.

http://forum.bukobot.com/index.php?topic=2667.msg3352#msg3352 indicates that I should be getting at least 12  V DC, and that 13.5-14V will give better performance.

Is my power supply defective, or is there anything else I should check? Input voltage fluctuates, but right now it is 121.4 V AC. There doesn't appear to be any switch on my power supply for switching between 120 and 240.
« Last Edit: September 04, 2013, 02:21:18 PM by Herb »
Bukobot Duo v2

whosawhatsis

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Re: Time required for heater platform to reach temperature
« Reply #1 on: September 04, 2013, 08:22:47 PM »
If your open-circuit voltage is only 10.67, you probably turned the adjustment pot all the way down, instead of all the way up. To turn it up, you should turn clockwise.

All of the power supplies have input voltage switches, they are on the side, below the sticker indicating which way to switch them. Note, this switch is not accessible once the power supply is mounted under the machine, so you'll have to remove the power supply if you have already mounted it.

Pictures:
https://www.dropbox.com/s/83monsklqi9utim/2013-09-04%2013.04.46.jpg
https://www.dropbox.com/s/paiekhumunde45a/2013-09-04%2013.05.11.jpg

Herb

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Re: Time required for heater platform to reach temperature
« Reply #2 on: September 04, 2013, 09:14:06 PM »
I should have unmounted the power supply and looked more closely. My power supply was switched to 220. And with the power supply switched to 220, the adjustment pot has minimal effect (less than 0.5 V) between the minimum and the maximum.

I switched the power supply to 120, and now I am getting the proper output voltage, and the adjustment pot works as expected.
Bukobot Duo v2

 

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