SainSmart Genmitsu Manuale utente
SainSmart Genmitsu Controller Board (GRBL)
with ABS case and built-in fan
for Genmtisu CNC Router 3018, 3018-PRO, 1810-PRO
User Manual
V1.0 Jun 2020
1
Preface
Dear customer,
Thank you for purchasing the SainSmart Genmitsu Controller Board. This controller board is
designed for the Genmitsu 1810-PRO, 3018 and 3018-PRO CNC milling/engraving machines. It is
also compatible with our blue SainSmart laser module. In general, it can also be used with other
3018 series CNC machines and laser modules of other manufacturers. For understandable
reasons, however, we cannot guarantee this.
As always, the latest version of this user manual can be found at https://docs.sainsmart.com/.
You can also get help and support in the Facebook group (SainSmart Genmitsu CNC Users
Group, https://www.facebook.com/groups/SainSmart.GenmitsuCNC).
In addition, as always, our superior SainSmart support is available to you at the e-mail address
We are always available for you, even after your purchase!
2
Table of Content
Topic
Page
Preface
1
Table of Content
2
1 –Parts List
3
2 –Control Module Design
4
3 –Setting Vref
12
4 –Assembly and Operation
13
5 –Update Firmware
15
6 –Optional Accessories
20
3
1 –Parts List
GRBL Controller
USB cable (USB-A <-> mini-USB)
4
2 –Control Module Design
The control module measures just 91mm x 87mm x 23mm. It has a very quiet, brushless fan
which provides sufficient cooling for the three A4988 stepper motor drivers, which have a
common aluminium heat sink. Each of these 3 stepper motor drivers can deliver a motor current
of up to 2A at 12V. For the NEMA42 or NEMA57 stepper motors typically used in CNC
milling/engraving machines, these stepper motor drivers offer more than enough power and do
not need to be operated at the upper end of their specification.
Hint:
During the first turn on, please set the current required for the stepper motors using the three miniature potentiometers
located on the board. This is described in more detail in a later chapter under the heading "Setting Vref".
Connection and operating elements
The following elements are located on the upper side of the control module, seen from left to right:
•Light emitting diodes for Spindle/Laser (blue), +12V (red), +24V(red)
•Connection for PWM-controlled 12V DC laser module (red)
•Connection for 24VDC spindle motor (white)
•Connection for stepper motor of X-axis (white)
•Connection for stepper motor of the Y-axis (white)
•Connection for stepper motor of Z-axis (white)
5
2 –Control Module Design
Connection for 24V spindle motor
The connection for the 24VDC spindle motor is controlled by an IRF024 N-channel MOSFET with a maximum load of
10A. Since the MOSFET is not cooled, the maximum load capacity should not be used. However, this is still quite
sufficient to operate a 775ER type motor. The speed of the spindle motor is controlled by pulse width modulation
(PWM).
Pin assignment: PCB edge
-+
Connection for 12V PWM laser module
A PWM-controlled laser module can be connected to the red, 3-pin connector. Please note that either the spindle motor
or a laser module is connected to their respective connectors. Simultaneous connection and operation of spindle motor
and laser module is not supported by the control module.
Pin assignment: PCB edge
+12V PWM GND
6
2 –Control Module Design
Connection for Stepper Motors
The module comes with 4-pin connectors for 3 stepper
Motors. One for the X-, one for the Y- and another one
for the Z-axis. The pin assignment is as follows.
Pin assignment: PCB edge
XH 2.54 type
B- B+ A- A+
Those stepper motors, that come with a built in 6-pin PH 2.00 type header
do normally have their pins assigned as follows.
Pin assignment: side facing axis
PH 2.00 type
A+ n.c. B+ A- n.c. B-
A+
A-
B+
B-
4-wire
Stepper Motor
7
2 –Control Module Design
Connection for external 24V power supply unit
On the left side of the control board there is a DC Power jack for connecting an
external 24VDC power supply.The outer ring is connected to GND whilst the
inner pin is connected to +24V.
Connection for PC
A PC can be connected via the mini-USB socket, which is also located on the left side of the control module. The USB
port is connected to the central processor of type Atmel ATMEGA328P via a USB-to-serial converter of type CH340.
The ATMEGA328P comes with a bootloader and the GRBL firmware version 1.1f already preinstalled at the factory.
On the bottom side of the control module the following elements are located, as seen from left to right
•On/Off switch
•Reset button
•8-pin connector for offline-controller
•Light emitting diode for TxD (blue)
•Light emitting diode for +5V (red)
•16-pin connector for Z-Probe (measuring tool) as well as Z-, Y- and X-limit switches
8
2 –Control Module Design
Connection for offline-controller
An external offline-controller can be connected to the 8-pin tub connector. This makes it possible to operate the CNC
milling/engraving machine connected to the control module independently without an additional PC. In such a case, the
positioning data (g-code) are stored beforehand on a micro-SD card located in the offline-controller.
Pin assignment: +5V GND TxD RxD
+5V GND Reset
PCB edge
9
2 –Control Module Design
Connection for limit switches and Z-Probe
Limit switches as well as a measuring device for the Z-axis (Z-probe) can be connected via the 16-pin plug that is also
available at the bottom edge of the control module.
Pin assignment: +5V A5 Z-lim Z-lim Y-lim Y-lim X-lim X-lim
GND GND GND GND GND GND GND GND
PCB edge
Hint:
Please note that the labeling for the connections of the X- and Z-limit switches on the board is reversed.
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