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Replacing F1 fuse (5A) to support more powerful heater?

Posted by paolo1968 
Replacing F1 fuse (5A) to support more powerful heater?
August 21, 2017 09:07PM
I have a big 8A heater.
Is it OK to replace F1 diode (5A) with a 11A one (similar to F2), and then simply connect the heater to D10?

Of course I need to install a good heat sink for MOSFET Q1, or to replace Q1 with a one capable of handling 8A without heatsink (IRLB8743PBFor IRLB3034PBF).
Of course I need a bigger power supply if I want to turn ON the heated bed too,
Anything else I miss?
VDX
Re: Replacing F1 fuse (5A) to support more powerful heater?
August 21, 2017 11:30PM
... be sure, the connectors can handle the current too -- or your "real" fuse will be the connection ...


Viktor
Re: Replacing F1 fuse (5A) to support more powerful heater?
August 21, 2017 11:35PM
Heater and steppers are fed from the same fuse. I'd be nervous the steppers might act up when the heater PWM kicks in.
Since you already replace the Fets, you could also beef up the power-traces on the PCB?
Scratch off the laquer and solder some extra single strand copper wire to the most stressed traces.

BTW: I'd look for inline fuses from cars instead of the polyfuses.

Edited 1 time(s). Last edit at 08/21/2017 11:36PM by o_lampe.
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