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Curtis 1352 eXm Manual, R ev. D
3 3 analog inputs (0–30V)
3 3 virtual digital inputs with programmable thresholds (using the analog
inputs)
3 2 analog inputs are selectable for voltage input or resistive sensors
3 Built-in coil flyback diodes
3 Software and hardware watchdog circuits ensure proper software operation
3 CANopen interface
3 Controlled by a fixed PDO map and programmable over SDOs
3 IP65-rated enclosure allows the eXm to be mounted in multiple
orientations, and protects it even in harsh environments
3 Status LEDs provide external status of module.
DESCRIPTIONS OF KEY FEATURES
Versatile I/O
High frequency PWM outputs
Six identical FET drivers are designed to sink up to 3 amps through a resistive
or inductive load. High frequency PWM (>16kHz) provides smooth current
to the load. Internal flyback diodes to B+ are incorporated to reduce voltage
spikes caused when pulsing coils.
Constant current and constant voltage output modes
The eXm’s DSP runs at 32 MIPS (Million Instructions per Second), allowing
the eXm to run six fast PI (Proportional/Integral) closed loop controllers. The
eXm’s PI controllers provide an accurate constant current to the load, which is
important for precise control of proportional valves.
Each output can also be programmed for constant voltage mode. In this
mode, the battery voltage is monitored and the PWM command is corrected
to provide a constant average voltage, compensating for fluctuating battery
levels and droops.
Each output can also be set to provide a directly commanded PWM%
or turned off to be used as an input.
Programmable dither for hydraulic valves
The eXm can add a programmable level of dither to the PWM output. This
keeps the seals of a proportional valve oiled, allowing the valve to move freely for
accurate PV control. Dither is only active on drivers in Constant Current mode.
1 — OVERVIEW
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