Product User’s Manual –
6.0 SAFETY FEATURES
SmartDrive160 incorporates some safety features which make it a robust and reliable motor
driver. Below are the detailed descriptions for each feature.
a.
LiPo Under Voltage Warning (Error LED blinks 3 times)
Upon power on, SmartDrive160 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.
b.
Overvoltage Protection (Error LED blinks 4 times)
When the motor is slowing down, current will be generated and flow back to charge
the battery. However, if the power source cannot absorb the current generated by the
motor, the voltage will rise. If the motor driver detects the rise in voltage, it will slow
down the deceleration of the motor. If the voltage rises to a dangerous level, the motor
will be braked immediately by shorting the 2 motor terminal to prevent any damage to
the motor driver.
c.
Overcurrent Protection (OC LED turns on)
When overcurrent occurs, the current will be limited by each PWM cycle.
The actual overcurrent threshold is depending on the temperature of the board.
d.
Over Temperature Protection (Error LED blinks 5 times)
SmartDrive160 is equipped with a temperature sensor to monitor its operating
temperature. It will gradually lower down the current limiting threshold base on the
temperature.
Temperature Range (
o
C)
Over Current Threshold (A)
< 60
194
60 70
175
70 80
163
80 90
144
90 100
125
100 110
100
> 110
50
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