Training Guide Course No. 196514
Level 2 Maintenance, X-1000 Series Dispensing Systems 2-155 P/N 196515 (Revision A)
Information Sheet 2-17-2
PMAC (Continued)
B. PMAC Watchdog
1. The PMAC motion control board has an on-board “watchdog timer” circuit
whose job it is to detect a number of conditions that could result in a
dangerous malfunction of the equipment.
2. It provides a fail-safe shutdown to guard against
Software or hardware malfunction
- The timer must see a square wave input of a frequency greater than
25 Hz.
DC voltage significantly lower than 4.75 volts.
- This prevents corruption of registers due to insufficient voltage.
3. If the red LED light on the PMAC card is on, there is likely a problem.
4. If the watchdog has been tripped, power to the PMAC must be cycled off and
on.
5. If the red LED stays lit on reset, you must determine whether the problem is
hardware or software related.
6. The first step is to reinitialize the PMAC.
7. If the red light remains on after you have reinitialized the PMAC, a hardware
problem is likely.
C. Reinitializing the PMAC
1. To reinitialize the PMAC, reset the PMAC to factory defaults.
2. Download the PMACINI.PMC file from the C:\FmNT Directory
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