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FAULT PROTECTION TORQUE/SPEED CURVES
The MDM60001 is internally protected against over temperature, over/under voltage, and
short circuits.
The over temperature set point is between 60C and 70EC. Care should be taken when
choosing a heatsink so that there is good thermal flow, otherwise hot spots may occur in
the MDM60001 which will reduce the effectiveness of the thermal protection.
The short circuit protection consists of PHASE to PHASE, PHASE to GROUND, and +V
to PHASE.
In the condition where the DC voltage of the driver drops below +23 volts the driver’s
output stage will be disabled. When the driver’s DC voltage rises back above 24 volts, the
driver will automatically re-enable the outputs (if previously enabled).
In the condition where the DC voltage of the driver exceeds approximately 82 volts, the
driver will execute a fault.
If any fault is detected by the MDM60001, the outputs will be disabled and can not be re-
enabled without resetting or powering down the driver. At the same time the open collector
FAULT output is turned on.
The FAULT output is non-isolated and has the ability to sustain the maximum driver
voltage. It is capable of sinking up to 25mA which can be used to drive a small relay or
LED.
OVER TEMPERATURE PROTECTION
The MDM60001 microstepper is a power device and is designed to protect itself from
overheating. It does this by monitoring the surface temperature of the drive plate and will
automatically shutdown if the temperature reaches 60°C (152°F).
To prevent nuisance shutdowns, proper heatsinking is required to limit the temperature at
the drive plate.
A thermal grease or 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.