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Lubricated Rotary Vane Laboratory Vacuum Systems
5.0 Troubleshooting
Problem
Power failure
Unit lacks sufficient vacuum or
lag alarm has occurred (if ena-
bled)
4107 9021 88.01
Possible Causes
Main fuse blown
Fuse blown in control circuit
Clogged inlet filter
Restrictions in piping
There are leaks in the system/piping
Insufficient pump speed (RPM)
Line losses too high
Unit operating at an elevated altitude
Inlet check valve plate assembly is
worn or damaged due to process
contamination
Oil tank is low/empty of oil
Oil tank has contaminated oil or was
filled with the incorrect type of oil
Leaking oil lines on the pump could
introduce an atmospheric pressure
bleed spoiling the vacuum
Clogged exhaust oil filter
Defective gaskets
Transducer fault with lag alarm
Solution
Replace fuse.
Replace fuse.
Clean filter.
Check for dirty/clogged inlet filter.
Confirm diameter of lines is correctly sized.
Check hose/pipe and connections for possible
leaks. Repair as necessary.
Check voltage and amperage to motor.
Inspect motor and coupling halves.
Check that the pump shaft turns freely.
Check for dirty/clogged filter elements. Replace
as necessary.
Confirm diameter of lines is correctly sized.
If piping diameter is too small, replace with
larger diameter.
Contact the factory for assistance. Performance
is reduced when operating above sea level
(see Section 2.4).
Disassemble valve plate assembly, clean, re-
place worn or damaged parts and reassemble.
Immediately shut off the pump, drain the
remaining oil from the tank and replenish with
new fresh oil.
Make sure the pump has reached its operating
temperature before shutting down and replace
with fresh new oil. Refer to section 6.2 for the
correct oil type.
Check all oil lines for leakage. Replace or tight-
en as required. Make sure to use the same size
and type of line when replacing.
Measure the amount of pressure between
the exhaust side of the pump cylinder and
the exhaust oil separator(s). The separator el-
ement(s) must be replaced if this pressure is
near 0.7 bar or greater (approximately 10 psig).
Inspect gaskets for breakage or disintegration.
Replace if necessary.
Replace transducer (TAe controls only).
5-1
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