APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
B--12 20950 Issue 1 April 98
flashes and power is restored to the printer, regardless of any fault
conditions.
Two parallel power supply circuits provide power the peltier, cooling
fanand solenoidfromonesupplyandthesensorsand alarms from the
other. A monitor circuit can detect if the peltier supply is interrupted
and activates the alarms as a warning (without disturbing the power
supply to the printer).
A lockout modehascurrentfault andhistory LEDs indicating present
and past faults. Once a current fault is sampled the history LED is
turned on, a time delay is startedandafteran elapsed time, the power
tothecompressoriscut. Theairdryerremainsinthisstate,enablingthe
history LEDs to be inspected to identify the fault. Reset switch SW2
cancels the alarms, resets the LEDs to off and restores power to the
compressor.
Removing power to the compressor causes a pressure fault which is
sensed by the printer. The printer will perform a soft shut--down and
raise a red alert.
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