DMC 60™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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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.
8
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.
9
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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