Thermo Electron 8600 Series, Руководство по устранению неисправностей

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2.10 Symptom: High Stage System Failure Alarm
Order Possible Cause Verification Action
1
Clear HS System Failure Alarm in Configuration
Mode.
2
Fan(s) not running.
See procedure for troubleshooting fans under “Hot
Condenser” alarm.
High stage compressor not starting or not running.
Inadequate power at the customer’s
site. Check voltage at the wall and monitor for large
voltage drop during start-up. If voltage drops below 90V for 120V units or 180V for 230V
units, contact customer.
No voltage at compressor. LD2 and LD4, on high
voltage board, are not on. Line voltage is within specified limits
For LD2 measure voltage between U13-12 and J11-1, for LD4
measure voltage between U13-14 and J11-1, on micro board. If
voltage is less than 10VDC, replace micro board.
If voltage is greater than 10VDC, for LD2 measure voltage from
right side of D3 to right side of D4, for LD4 measure from right
D7 & right side of D8 on high voltage board. If voltage is less
than 10VDC, check ribbon cable. Ribbon cable OK, replace
high voltage board.
No voltage at compressor, LD5 (HS) on high
voltage board is on. Check connections: enclosure, high pressure cutout switch. Ohm
out pressure switch. Switch to be closed. Switch OK, measure
voltage between pins 4 and 5 of J30. If no voltage, replace high
voltage board.
Switch defective; jumper around switch and continue to test.
No voltage at compressor LD5 (HS) is off and
should be on. If voltage between U13-15 and J11-1, on micro board, is less
than 10VDC, replace micro board.
Else, if DC voltage across D12 on high voltage board is greater
than 10VDC, check ribbon cable. If ribbon cable OK, go to
previous verification.
Else, if D12 voltage less than 10VDC, replace high voltage
board.
AC power to high stage compressor.
If required, go into test mode; turn
both fans and high stage compressor
on.
Voltage at compressor Check continuity of compressor thermal switch.
Check winding resistance of compressor.
See Appendix B
Check compressor-starting hardware. Replace parts as needed.
3
HS compressor cycles on high-
pressure cutout. Install pressure gauges on high stage and verify
that high-pressure cutout is functioning normally. Replace defective high-pressure cutout.
4
HX probe reading incorrectly.
Compare T/C reading on interstage heat exchanger
to resistance of HX probe and display value. See
Resistance to Temperature Chart
(page 3-2).
If T/C differs from resistance and displayed value, defective
probe. If displayed value differs from T/C and resistance value,
replace micro board.