TIMING FAULT PROTECTION
The Direction and Microstep Resolution Select inputs are synchronized with the The MDM10001 is internally protected against over temperature and short circuits.
positive going edge of the Step Clock input. When the Step Clock input goes high, the The over temperature set point is between 60°C and 70°C. Care should be taken when
Direction and Microstep Select inputs are latched and further changes to the inputs are choosing a heatsink so that there is good thermal flow, otherwise hot spots may occur
ignored until the next rising edge of the Step Clock input. in the MDM10001 which will reduce the effectiveness of the thermal protection.
After these signals are latched, the MDM10001 looks to see if any changes have The short circuit protection consists of PHASE to PHASE, PHASE to GROUND, and
occurred to the Direction and the Microstep Select inputs. If a change has occurred, +V to PHASE.
the MDM10001 will execute the change before taking the next step. Only AFTER the
change has been executed will the step be taken. If no change has occurred the If any fault is detected by the MDM10001, the outputs will be disabled and can not be
MDM10001 will simply take the next step. This feature works as an automatic re-enabled without resetting or powering down the driver. At the same time the open
debounce for the Direction and Microstep Select inputs. collector FAULT output is turned on.
The minimum pulse width for the Clock input is 75 nS. The typical execution time for The FAULT output is non-isolated and has the ability to sustain the maximum driver
a Direction or Microstep Select change is 100nS. The typical execution time for a voltage. It is capable of sinking up to 25mA which can be used to drive a small relay
Clock input is 100nS. or LED.
The Reset and Enable inputs are asynchronous to any input and can be changed at any
time.
The Reset requires a minimum pulse width of 500 nS.
The Fullstep output typically occurs 75nS after the positive edge of the Step Clock overheating. It does this by monitoring the surface temperature of the drive plate and
(excluding changes to the Direction or the Microstep Select inputs). will automatically shutdown if the temperature reaches 60°C (152°F).
OVER TEMPERATURE PROTECTION
The MDM10001 microstepper is a power device and is designed to protect itself from
To prevent nuisance shutdowns, proper heatsinking is required to limit the temperature
at the drive plate.
Thermal grease or a thermal pad should be used between the drive plate and the
mounting surface of the heatsink. The fins of the heatsink should be mounted
vertically with at least 3" of space below and above the heatsink for efficient cooling.
In some applications fan cooling will be required to maintain the plate temperature
below the 60°C shutdown temperature.
Komentáře k této Příručce