Product User’s Manual –
7.0 SAFETY FEATURES
incorporates some safety features which make it a robust and reliable motor
driver. Below are the detailed descriptions for each feature.
a.
Reverse Polarity Protection
Unlike the other motor driver in the market, SmartDrive40 incorporates 2 extra
MOSFET for reverse polarity protection. Hence, user no longer will see smoke
coming out from the board if the power supply is connected at wrong polarity.
b.
LiPo Under Voltage Warning (Error LED blinks 3 times)
Upon power on, SmartDrive40 will automatically detect the number of cells for the
LiPo battery. If the input voltage falls below 3.3V per cell during operation, the error
LED will blink to warn the user. However, the power to the motor will be maintained
and will not be cut out. Thus, it is the user’s responsibility to stop the motor and
replace the battery to avoid further damage to the battery.
If the other type of battery is used to power the board, the LiPo under voltage warning
will still be shown. In this case, user may ignore the warning and he/she needs to
estimate when to replace the battery by him/herself.
c.
Over Current Protection (Error LED blinks 4 times)
If over current is detected for more than 1 second, the current limiting feature will
kick in and limit the motor current to the over current threshold (40A by default). The
current limiting only starts working after 1 second to allow a higher startup current for
the motor when it starts running.
The actual over current threshold is depending on the temperature of the board.
d.
Over Temperature Protection
SmartDrive40 is equipped with a temperature sensor to monitor its operating
temperature. It will gradually lower down the over current and current limiting
threshold base on the temperature as shown below:
Temperature Range (
o
C)
Over Current Threshold (A)
< 110
40
110 – 120
35
120 – 130
30
130 – 140
25
> 140
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