AVT 1623 User manual

1
The system shuts off power to the DC motor when
the current consumption increases above the
monitored value. Thus, the device can act as a limit
switch.
• 3-15 V DC motor power supply
• load current < 1A
• stepless adjustment of the tripping current in the
range of 0.1-1 A
• 5 V DC power supply
• dual-mode operation
Characteristics
• control button
• option to expand the system
will be changed, that is, the motor will operate
rotating in the opposite direction, for example, to the
left. If the motor axis is not stopped, the motor will
automatically shut down after about 20 s.
Pressing the button starts the engine in the
conventional "first" direction, for example, to the
right. At this time, the value of the current drawn by
the motor is compared with the set value using
potentiometer PR1. When the motor axis is braked or
stopped, the current drawn by the motor will increase
significantly. Such an event will immediately cause the
system to react – the power supply to the motor will
be disconnected. Another press of the button will
restart the entire cycle, but the difference will be that
the polarity of the power supply to the motor
Pressing and holding the button will start the cycle in
force mode. It relies on the fact that when the power
supply to the motor is automatically disconnected,
but the button is still pressed, restart attempts will be
made at intervals of about 0.5 s until the button is
released. Such a feature will eliminate a possible
jamming of the mechanism.
The circuit, the schematic of which is shown in Figure
1, shuts off power to the DC motor if the current draw
increases above the monitored value. This allows the
system to act as a limit switch for a DC motor drive.
Circuit description
DC motor overcurrent circuit breaker
AVT 1623
PDF
DOWNLOAD
ASSEMBLY DIFFICULTY

Figure 1. Schematic diagram
Figure 2. Assembly diagram
2
Assembly and start-up
An assembly diagram of the system is provided in
Figure 2. The X2 connector is used to connect the
power supply to the circuit and the motor, X1 is the
motor connector, JP1 allows you to attach an
additional button and an optional LED. The R2, C5...C7
elements filter the power supply to the circuit, while
R6, R9, R10 and C8 allow us to set the overcurrent
cutoff threshold. The R8, R11...14, C9 elements are
used to measure the current consumed by the motor,
the T1 transistor controls the operation of the motor
and the PK1 relay is used to change the polarity, that
is, the direction of rotation of the motor.
PIC12F675P
10k
10
10 1k
1k
10
10k
1k
1k
10 10 10 10
BUZ11
GNDGND
+5V
+5V V+
100nF
100nF
GND
100nF
GND
100nF
+5V
GND
100nF
GND
+5V
V+
GND
+5V
100nF
100uF
100uF
VDD
VSS
1
8
GP5/CLKIN
2GP0 7
GP4/CLKOUT
3
GP2 5
GP1 6
GP3
4
US1
PR1
R1
R2 R3 R4
R5
R6
R7
R8
*R9
R10 R11 R12 R13
T1
PK1
2
4
3
9
7
8
PK1
C1
C2
X1-1
X1-2
X1-3
C9
C8
C3
LD1
X2-1
VM
GND
+5V
X2-2
X2-3
C5
C4
C6
1
23
4
JP1
1 2
S1
P_ON
P_ON
CURR
CURR
DIR
DIR SETT
SETT
SW
SW
RST
+
+
Figure 3. Example of connection to a common 4-6 V power supply
JP1
Optional external
components
5V
Common supply of the controllerand
the engine
MIN
MAX
Infinitely adjustable
tripping current
Control button

3
List of elements
US1: ...............................................PIC12F675!
Other:
PK1:................................................AZ850-5 or similar
LD1.................................................LED!
Semiconductors:
C1-C3, C5, C8, C9:.....................100 nF (may be labeled 104)
T1: ..................................................BUZ11 or similar!
R1, R2, R5, R10-R13: ................10 Ω (brown-black-gold)
R9: ..................................................do not solder
X1, X2:...........................................DG381-3.5/3
S1: ..................................................button
R6: ..................................................10 kΩ (brown-black-orange-gold)
PR1:................................................10 kΩ potentiometer, vertical
Resistors:
Capacitors:
C4, C6:...........................................100 µF!
JP1:.................................................goldpin 1×4
R3, R4, R7, R8:............................1 kΩ (brown-black-red-gold)
We begin the assembly by soldering the components onto the board in order of size, from the
smallest to the largest. When installing components marked with an exclamation mark, pay
attention to their polarity. Frames with pinout drawings and symbols of these components on the
circuit board, as well as photographs of the assembled kit, can be helpful. To access high-resolution
images as links, download the PDF.
!
JP1
5 V
3-15 V
MIN
MAX
Infinitely adjustable
tripping current
Optional external
components
Control button
1
U2
C5
C6
LED1
AC
T1
Figure 4. An example of connection to an independent power supply
Independent power supplyof
the controller (5V) and motor (3-15V)
shorter
leg
marker
marker
shorter
leg
PDF
DOWNLOAD

Notes
4
AVT SPV reserves the right to make changes without prior notice. Assembly and connection of the device not in accordance with the indications within the instructions, arbitrary change of
components and any structural modifications may cause damage to the device and expose users to harm. In such a case, the manufacturer and its authorized representatives shall not be
liable for any damages arising directly or indirectly from the use or malfunction of the product.
DIY kits are intended for educational and demonstration purposes only. They are not intended for use in commercial applications. If they are used in such applications, the buyer assumes
all responsibility for ensuring compliance with all regulations.
Leszczynowa 11 Street,
03-197 Warsaw, Poland
[email protected]
AVT SPV Sp. z o.o. This symbol means do not dispose of your
product with your other household waste.
Instead, you should protect human health
and the environment by handing over your
waste equipment to a designated collection
point for the recycling of waste electrical
and electronic equipment.