Power; Power Input - Aus3D RUMBA32 V1.1 Reference Manual

4 P
OWER
4.1 P I
OWER NPUT
Power is supplied to the board through two screw terminals, MAIN-PWR and HB-PWR. HB-PWR is the
input for the power supply for the heated bed. The heated bed should be connected to HB-OUT.
Figure 1: Main Power Terminals
MAIN-PWR supplies power to the entire board, excluding the heated bed. MAIN-PWR passes through
fuse holder F2. It is required to install a fuse before power is supplied to the board. It is recommended
to use one of the included 10A fuses for F2.
HB-PWR supplies power to the heated bed. HB-PWR passes through fuse holder F1. It is required to
install a fuse before power is supplied to the heated bed. It is recommended to use one of the included
20A fuses for F1.
It is not recommended to use a fuse larger than 20A on either MAIN-PWR or HB-PWR, as doing so may
exceed the current rating of the screw terminals and risks damaging the board.
In the event of a short circuit or overcurrent event on either the MAIN-PWR or HB-PWR rails, the
fuse(s) may blow to protect the board.
MAIN-PWR and HB-PWR are protected against reverse power supply polarity. In the event of the
power supply being connected in reverse, the fuse(s) will blow to protect the board.
In the event of a blown fuse, the fuse will need to be replaced to restore the board to correct
operation. Spare fuses are included with RUMBA32 boards sold by Aus3D.
RUMBA32 V1.1 User Manual – Rev A Page 5