I have a Dual Channel 10A DC Motor Driver from Cytron http://www.cytron.com.my/viewProduct.php?pcode=MDD10A&name=Dual%20Channel%2010A%20DC%20Motor%20Driver and 2 DC motors. One of them is having a problem and giving me serious headache!
This is the spec of the motor (water pump), bought from here http://www.lelong.com.my/mwp1201-miniature-dc-motor-water-pump-ericlim55-133393945-2014-07-Sale-P.htm:
Rated voltage: 7.2V
Off load Ampere: 1.2A
On load Ampere: 2A
Weight :71.2g
Operating voltage: DC3V to 12V (red dots positive)
Inlet and outlet of water can be reverse by reversing the supply polarity
Motor diameter: 27mm
Total pump length: 52 mm
Water hose diameter: 4 mm (included)
Test result: Using 6V 1A power adaptor, Water pump at 1.2 minute per litre.
I use a 12V 2A AC-DC adapter to power up the board (and hence the motor).
My problem is, why is that when I press the manual button on the motor driver board, this particular motor becomes jerking (ON-OFF-ON-OFF)? It jerks like several seconds then it turn OFF (even when I'm still pressing it).
Please help! I'm in a desperate situation considering the deadline is near!
EDIT:
What I've done to troubleshoot:
1. Swap motor channel.
2. Swap input to the motor (red wire to positive, red wire to negative).
3. Check using multimeter. When it's jerking it gives like less than 1V.
4. Not connect the motor to the driver, then press the button. LED for the channel works OK and got 12V. Hence the driver still works.
5. Connect the motor to DC generator. Motor works OK.