FutureKit FK823 User guide

R

+

¤Зº¤ШБ¤ЗТБаГзЗБНаµНГ‹ DC 12-50V. 5A.

Figure 1. DC PWM Motor Speed Control 12-50V. 5A. Circuit

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DC PWM MOTOR SPEED CONTROL

12-50V. 5A.

CODE 823

This is a speed control circuit for a DC motor. Not only the speed of
the motor can be controlled but the frequency also adjustable.(due to the
application of Plus Width Modulation technique)

Technical data

- Power supply : 12-50VDC. (jumper selection).

- Load voltage : 12-50VDC./ 5A. max.

- Motor speed (PWM) can be adjusted from 0% to 100%.

- Can be adjusted frequency 3 ranges (jumper selection).

1. Frequency range from 50Hz - 1kHz.

2. Frequency range from 240Hz - 13.84kHz.

3.Frequency range from 1.9kHz - 100kHz.

- IC board dimension : 3.01 in x 1.83 in.

How does it work

IC1 generates the frequency with respect to the values of R1, R2,
VR1 and C3 whereas VR1 adjusts the frequency as desired. If the
positive pulse is greater than the negative one, then the motor revolves
quickly. But if the negative pulse is greater than the positive one, then the
motor revolves slower. The frequency will be sent through the base of
TR1 and TR2 for driving the mosfet for control the motor.

Jumper JF1 and JF2 are used for select the frequency and jumper
J1-J4 are used for select the voltage of power supply and motor.

Circuit Assembling

The assembly of components is shown in Fig. 2. For good looking and
easy assembly, the shorter components should be first installed - starting
with low resistant components and then the higher. An important thing is
that diodes, electrolyte capacitors, and transistors shall be carefully
assembled before mounting them onto their right anode/cathode of the
IC board otherwise it might cause damage to the components or the
circuit. Configuration of the anode and the cathode is shown in Fig 3. Use
the soldering iron/gun not exceeding 40 watts and the solder of tin-lead
60:40 with flux within. Recheck the correctness of installation after
soldering. In case of wrong position, just use lead absorber or lead
extractor wire to avoid probable damage to the IC.

Testing

Connect a motor at point M+ and M- to energize the circuit - the
anode to M+ pole and the cathode to M- pole. For power supply, select
the jumper J1-J4 to match the voltage applied to the motor.

The voltage can be selected 4 ranges : J1 for 12V, J2 for 24V, J3 for
30V and J4 for 50V.

Select the frequency range is 3 ranges (JF1 and JF2) : jumping JF2
only, 50Hz-1kHz. Jumping JF1 only, 240Hz- 13.84kHz and not jumping
JF1 and JF2, 1.9kHz-100kHz.

VR1 is used for the adjustment of frequency while VR2 is used for
the adjustment of speed.

NOTE:

- Frequency recommended for general use is 50-200Hz.

- If the connecting load is more than 1A and working continuously, a

mini fan should be installed at the heatsink.

Warning : Before use to choose jumper J1-J4 to match the voltage
supply to the circuit.

LEVEL 2

NO.1

Figure 2. Circuit Assembling

+

MOSFET

JF1

Figure 3. Installing the Components

R

R

Ω

3

VR

1

VR1

VR2

24V

30V

J2 J3

50V

J4

1

2

JF2

12V

J1

RESISTOR

R

R .....

Ω

R

TRIMMER

POTENTIOMETER

VR .....K

1

2

VR

IC

IC

1

POWER SUPPLY

+

12-50V
+M

-M

G

ELECTROLYTIC

CAPACITOR

C .....μ

F

+

Watch the polarity!

C

CERAMIC

CAPACITOR

C .....μF

C

TERMINAL TO

BOARD BLADE

C

PORT

+

C

IDE

-

MOTOR

+

TRANSISTOR

C

B

NPN

E

+

TR

DIODE AND ZENER DIODE

D

A

K

A

K

D

MOSFET

G

MOSFET

POTENTIOMETER

VR

PNP

Disconnection

Connection

JUMPER

NOTE:

FUTURE BOX

FB04

is suitable for

this kit.

E

B

C

TR

ZD

A

K

A

K

D

D

S

VR

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