APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
20950 Issue 1 April 98
B--11
Airdryer -- Electronics
Note:
Removing power to the compressor will remove the air output from
the airdryer.
The airdryer circuits perform the following functions:
D
Provide power to the Peltier cooling element
D
Maintain the Peltier cool side at or above 4 C to prevent icing of
the cooler in low ambient temperatures
D
Periodically open the condensate drain solenoid
D
Periodically sample the output air pressure and humidity, and if
either goes out of specification, (a) remove power from the
compressor and (b) provide visual and audible alarms
D
Provide fault indications.
The Peltier heat pump in the cooler is supplied with power taken from
an unregulated 12V supply generated on the printed circuit board.
With this level of power input, the heat pump can provide a 25 C
temperature difference between its hot and cold faces. When the
ambient temperature is less than 29 C, a thermistor control circuit
interrupts the supply, preventing the cold face falling below 4 C and
avoiding the formation of ice.
Condensate is expelled at regular intervals from the Peltier cooler by
way of a solenoid valve. The solenoid is opened for 1 second by a
monostable triggered by a clock generator driving a counter. Link LK2
allows selection from a range of counts giving time intervals of, 6 secs,
12.5 mins, 25 mins and 100 mins.
The same counter provides clock signals to sampling latches at a rate
dependent upon the setting of LK1.
The humidity sensor is supplied with a simulated ac voltage derived
from a low frequency binary oscillator. The humidity alters the sensor
resistance and controls the input to a sampling latch. The pressure
switch provides a switched dc level into a second sampling latch.
LED’s 1 and 2 show these states. If the input to either latch is set, clock
pulses controlled by LK1 switch the latch to:
(a) Operate the alarm and fault indicator.
(b) Operate the relay to cut power to the compressor.
Switch SW1 (see Pg. B--31) allows selection of normal operation, or a
test condition, in which the sounder is stopped, the alarm indicator
Содержание A-SERIES
Страница 1: ...DOMINO A SERIES INK JET PRINTER OPERATION AND MAINTENANCE MANUAL ...
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Страница 12: ...HEALTH AND SAFETY 1 2 27080 Issue 1 August 98 ...
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Страница 36: ...OPERATION 3 2 27080 Issue 1 August 98 ...
Страница 55: ...DISPLAY MESSAGES AND FAULT FINDING 4 2 27080 Issue 1 August 98 ...
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Страница 136: ...PRINTER DESCRIPTION 6 20 27080 Issue 1 September 98 ...
Страница 137: ...DESCRIPTION 27080 Issue 1 August 98 6 21 Wiring Diagram 37700W Iss 1 PELTI ER ...
Страница 138: ...DESCRIPTION 6 22 27080 Issue 1 August 98 ...
Страница 140: ...MAINTENANCE 7 2 27080 Issue 1 Sept 98 ...
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Страница 158: ...REPAIR 8 2 27080 Issue 1 Sept 98 ...
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Страница 200: ...SPARES AND ACCESSORIES 9 8 27080 Issue 1 Sept 98 Ink System General 2 3 5 6 7 8 9 10 11 12 1 MG045_1 4 ...
Страница 202: ...SPARES AND ACCESSORIES 9 10 27080 Issue 1 Sept 98 Ink Management Block 1 2 3 4 5 6 7 8 9 10 6 MG046_1 ...
Страница 204: ...SPARES AND ACCESSORIES 9 12 27080 Issue 1 Sept 98 Electronics Door Assembly A300 A200 1 2 3 4 5 6 7 8 9 MG060_2 ...
Страница 206: ...SPARES AND ACCESSORIES 9 14 27080 Issue 1 Sept 98 Electronics Door Assembly A100 1 2 3 4 5 6 7 A1003_2 ...
Страница 208: ...SPARES AND ACCESSORIES 9 16 27080 Issue 1 Sept 98 Electronics Inner Door 1 2 3 4 5 6 7 ...
Страница 210: ...SPARES AND ACCESSORIES 9 18 27080 Issue 1 Sept 98 Electronics Cabinet MG067_2 1 2 3 4 5 6 7 8 10 11 12 13 14 15 9 ...
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Страница 214: ...OPTIONS 10 2 27080 Issue 1 Sept 98 ...
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Страница 242: ...APPENDIX A INSTALLATION A 2 27080 Issue 1 Sept 98 ...
Страница 261: ...APPENDIX B COMPRESSOR DRIVEN AIRDRYER B 2 20950 Issue 1 April 98 ...
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