The heatbed should be inside the operating parameters of these two. Second is the actually amperage that your PSU can deliver. Many RAMPS clones use MOSFETs that are not rated for 11A or even the average 8A you will see on a 12V heatbed. If you get a heater that draws more power it will kill your MOSFETs. Your theoretical limit is 11A at 120V, which is about 120W that a heater can consume. The first consideration is the MOSFETs of your board. There are many factors when considering if a heatbed will work with your RAMPS board or if your heatbed will destroy your board. This board is mainly a 12V board, but could be modified to work at 24V. This does add another set of steps to the assembly process, but we stuck with larger sizes to make it fairly painless. This provided more space for more passive components, as well as headers. In RAMPS 1.4 the capacitors and resistors are now surface mount (SMD) components. 6 Hacking (archived information and notes).5.3.1 Other production boards found in the wild.5.1 The Heat Bed Mosfet gets TOO HOT!!!.2.7.2 Power Supply, Details and Considerations.2.7.1.1 Power for the Arduino Mega board.It is strange it shows one speed but a voltage range. All are (6)4 pin headers for the fans except one and it is a 3 pin header. When you buy the fan make sure you can control the speed: If you don't own a fan you can find some fairly cheaply but you need to find out what controller you have. Set to 100%, then 40% to see if the speed changes.ĥ) Example fan profile: case fan at 40% speed until 40degC then RAMP up to 100% speed at 80degC (it will never reach 100%). May have to just try a fan).Ģ) Enable fan control in the BIOS if needed.ģ) Download and install your motherboard fan control software (motherboard support site).Ĥ) Play with the fan profile.
Older motherboards may have VOLTAGE only for everything.ġ) Determine what TYPE of controller you have (not always obvious.
My motherboard supports both PWM and Voltage for the case fans, but only PWM for the CPU_FAN controller. The two types are:Īdditionally the FAN controller must be capable of controlling this. MOLEX is usually not controllable, though there are some rare exceptions which work with 3-pin/4-pin adapters. *There are two types of fans that have speed control.
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