Stratasys uPrint, Service Manual, Page: 18 / 383

uPrint/uPrint SE Service Manual 2-7
Controller Board
Overview
The controller board provides all of the low level hardware control and sensing for the
system. The firmware runs on the controller CPU and is flash resident (rather than on the
HDD and SBC).
Voltage Generation
• +/-15 VDC is used for PMD DACs
• 10 VDC is used for DAC reference
• 3.3 VDC is used for controller board logic
Dual Port Memory Interface
The dual port memory located on the controller board provides the communication channel
with the single board computer (SBC) through the P104 connector. The SBC provides the
coordinates, velocities, and flow rate commands for modeling to the controller. The
controller board provides the status/error information about the hardware back to the SBC.
X, Y, Z Axis Control
The controller takes the flow rate information from the SBC and sends it to the PMD
processor. The PMD 2840 processor services the X and Y stepper motors and the model and
support head servo motors. The 3410 processor services the Z axis stepper motor. There is no
feedback from the stepper motors to the system (they are open-loop controlled).
Material Motor Control
The controller takes the flow rate information from the SBC and sends it to the PMD 2840
processors. The PMD uses this information along with the encoder signals from the material
motors to generate an output signal to drive the servo motors in the head assembly. Since the
encoders provide feedback the material motors have a closed-loop control. Their position
and rotation are precisely known at all times.
Temperature Control
The controller board reads the three thermocouple (T/C) inputs/signals - 2 for the head, 1
for the chamber.