Foink (Prodigy I Systems Df+11999 And Lower Only); Foink Functions; Motion Control And Detection - GE Medical Systems PRODIGY Service Manual

2.12 FOINK (PRODIGY I Systems DF+11999 and lower
only)

2.12.1 FOINK Functions

2.12.2 Motion Control and Detection

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2-74 System Overview
• The FOINK Board optically isolates control circuitry (SBC) from the rest
of the scanners electronics (see pan layout Appendix 2B).
• Shutter solenoid
• Scanner Motor Controllers
• Display Panel indicators and controls
• Monitors 5 different interrupts, all of which are capable of resetting the
SBC (shutting down x-ray production)
• Emergency Stop Switch - open circuit - (loss of signal - failsafe)
• Tube Head Thermocouple - circuit open (loss of signal - failsafe)
• Longitudinal Motion Interrupt - source open no movement (OMI)
• Transverse Motion Interrupt - source open no movement (OMI)
• Failure of the +28 VDC Power Supply
• Motor pulses, RUN/HOLD signals and direction are generated by the
SBC.
• The RUN/HOLD signals are optically isolated on the FOINK board before
being sent to the Centent motor drivers. The Centents supply current to
the stepper motor windings.
• Both the transverse and longitudinal drive systems have slotted disks
attached which pass through optical interrupters (OMI) for motion
detection. Should motion stop during patient scanning, the FOINK sends
an interrupt to the SBC, which is reset and x-ray production is halted.
• Limit switches at each end of the scanner and each end of the arm signal
the SBC whenever motion reaches either end or side of the scanner. If a
limit switch is tripped during a patient scan, the motor associated with the
tripped limit switch is halted, the SBC is reset and the shutter is closed.
• There is a dedicated DC power supply for the motion control circuitry,
supplying +26VDC. The +26VDC ground is isolated from the logic
ground to reduce noise (see section 2.1.1 for location)
PRODIGY Service Manual (Rev C - 2000)