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Troubleshooting Of Oil Mist Remover - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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4.3 Troubleshooting of Oil Mist Remover

Problems and actions to be taken are as follows.
① The vacuum indicator shows a red mark
The pressure gauges reads zero (0) MPa.
Pressure setting of the regulator is lower ?
Pressure of a control air is lower than the regulator
setting value ?
The gear case or gear case vent pipe has a leak
(for example, the oil filling port plug on the gear case is not tight).
The solenoid valve may have problem or the remover
element may be dirty.
If the solenoid valve has no problem replace the element.
② The OMR relief valve opens immediately when starting the air compressor (the control air pressure is still
low) or when the DSP has stopped. This is a normal occurrence.
The OMR relief valve is dirty or stuck open by a foreign
object.
Go to the procedure ①. The vacuum indicator shows a
red mark. (Gear case has a positive internal pressure.)
NOTE:
The OMR relief valve opens immediately when starting the DSP (the control air pressure is still low) or when the DSP has
stopped. This is a normal occurrence.
③ Oil is vented through the ejector's compressed air outlet (the separated oil is not being recovered).
Accumulated oil is visible in the tube between the
element housing and the fl oat trap.
Upper or lower packing is not seated properly on the
element ?
Control air contains oil ?
Element may be dirty.
Inspect the element and replace if necessary.
④ Oil pressure is low (oil pump may be inhaling air).
Problem of compressor (dirty oil filter, low oil pressure due
to oil leakage, failure of oil pump or OMR relief valve, etc.)
Foreign matter in float trap nozzle (Check for a large
amount of air sucked from the oil collecting pipe to oil
pump suction side.)
NOTE:
The oil mist remover makes the gear case internal pressure negative during operation, reducing the pressure by 0.7 to 1.5 psi
(0.005 to 0.01 MPa). This is not unusual; reset the oil pressure on the air OMR relief valve.
4. TROUBLESHOOTING [Troubleshooting of Oil Mist Remover]
NO
NO
NO
NO
NO
No
No
No
NO
YES
The control air is not supplied.
Reset the regulator to a proper pressure.
YES
Clean the filter.
YES
Maintain the pressure of a control air at the regulator
setting value.
YES
- Tighten every screw and plug to remove all leaks.
- Make sure that the OMR relief valve is closed.
YES
Disassemble and clean the OMR relief valve.
Replace if necessary.
YES
Clean the nozzle of the fl oat trap.
YES
Reinstall the element, seating the packing properly for a
maximum sealing performance.
YES
Check the control air for oil contents.
YES
Perform necessary adjustment or replacement.
YES
Disassemble and clean the float trap nozzle and the
float trap.
39

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