2.4 m Alt-Azimuth Telescope Maintenance Manual MM-12920-1
EOS Technologies, Inc. • 3160 East Transcon Way, Suite 180 • Tucson AZ 85706 • USA
12/1/2009
Tel: +1 520 624 6399 • Fax: +1 520 624 1906 • Web:
www.eostech.com
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7. If the fan blades require cleaning, remove the hardware securing the fan grill and carefully
clean the blades using a vacuum cleaner and soft brush attachment. Reinstall the fan grill
and fasten the hardware.
8. Carefully remove and check the condition of the filter on the fan inlet located at the bottom of
the telescope control cabinet bi-monthly.
9. If the filter is dirty and requires cleaning, take the filter outside and apply a mixture of
dishwashing liquid and water in a squeeze bottle to the dirty side of the filter and let it sit with
the dirty side face down for several minutes.
10. Using a garden hose, spray from the clean side of the filter to drive the dirt out of the filter
and rinse off the dishwashing liquid.
11. Gently shake the filter to remove excess water after rinsing and allow the filter to completely
air dry or blow dry using low pressure filtered (to eliminate oil from the line) compressed air.
12. Reinstall the dry filter into the bottom of the telescope control cabinet.
13. Record the maintenance completed in the log book.
14. For each computer, perform a visual inspection of the cooling fans monthly. With the
computer running, perform an audio inspection by listening to the sound of the fan.
15. If the fan motor sounds as though it is nearing the end of its lifecycle, schedule corrective
maintenance and replace the fan.
16. Record preventive maintenance completed in the log book.
2.3.3 VOLTAGE CHECK ON DC POWER SUPPLIES
There are 24 VDC and 56 VDC power supplies in the telescope control cabinet.
1. Turn on the 24 VDC power supply to confirm it is operational. Verify the indicator lamp
illuminates.
2. Turn on the 56 VDC power supply to confirm it is operational. This is a dual 28 VDC supply.
Verify the indicator lamp illuminates.
3. If the lamp for the power supply fails to illuminate, press the test button for the indicator
lamps. If the lamp illuminates during the lamp test, but fails to illuminate when the 56 VDC
power supply is turned on, the power supply is malfunctioning. Test the voltage at the
amplifier using a digital volt meter, +HV, -HV and check for 56 VDC.
4. Record preventive maintenance completed in the log book.
2.4
TESTING EMERGENCY STOP BUTTONS
Test all emergency stop buttons located in the observatory monthly.
1. Verify that each Emergency stop button is operational. If an Emergency Stop button
malfunctions, the telescope system shuts down.
WARNING! If an Emergency Stop button fails the test, immediately tag the
button with a warning message to alert others that the button has
malfunctioned.
