Digilent DMC 60 Reference Manual - Page 6

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DMC 60™ Reference Manual

4. Release the Brake / CAL button.

5. If calibration was successful then the top and bottom LEDs will quickly alternate between Green and Off

and the new calibration constants will be stored in non-volatile memory. If calibration failed, then the top

and bottom LEDs will quickly alternate between Red and Off and the device will continue to operate using

the existing calibration constants.

Note: Calibration may only be performed while a servo input signal is present.

To restore default calibration:

1. Disconnect the power source from the DMC 60.

2. Hold the Brake / CAL button down.

3. While continuing to hold the button, apply power to the DMC 60.

4. Continue holding down the button until the top and bottom LEDs alternate quickly between Green and

Off.

5. Release the Brake / CAL button.

Internal Temperature Monitoring and Over

Temperature Protection

The DMC 60 features an onboard thermistor, which allows the temperature of the circuit board to be continuously

monitored. When the motor controller detects that the temperature of the circuit board has exceeded 70°C it will

begin to decrease the duty cycle of the output. Additionally, the color of the LED indicators will be changed to Cyan

(forward) or Fuchsia (reverse) to indicate that the device is operating in reduced duty cycle mode. As the

temperature continues to rise, the duty cycle will be further reduced at a rate of approximately 2.85% per degree C

until the temperature of the PCB exceeds 100°C, at which point the output duty cycle will be set to 0% and an over

temperature fault will be signaled. The motor controller will continue to operate with a decreased duty cycle until

the temperature of the PCB falls below 70°C, at which point, it will resume outputting the duty cycle that

corresponds to the input signal.

Input Voltage Monitoring and Under Voltage Protection

The Digilent Motor Controller's (DMC1 and DMC2) continuously monitor the input voltage. If the input voltage falls

below 5.75 Volts (+/- 2%) for 5 or more seconds, then the output duty cycle will be set to 0% and an under voltage

fault will be signaled. The output will remain disabled until the fault is cleared (3 seconds), at which point it may be

re-enabled if the under-voltage condition is no longer present.

10 Fault Indicators

When a fault condition is detected the output duty cycle is reduced to 0% and a fault is signaled. The output will

remain disabled for 3 seconds. During this time the onboard LEDs (LED1, LED2, LED3, and LED4) are used to

indicate the fault condition. The fault condition is indicated by toggling between the top (LED1 and LED2) and

bottom (LED3 and LED4) LEDs being on and off. The top LEDs will be Red during them on state. The color of the

bottom LEDs depends on which faults are presently active. The table below describes how the color of the bottom

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