2200LZJE-HO-C6-N_2013.12.
Chapter 6 Troubleshooting
Compound 2-stage Screw Compressor 2016**C
6-7
Symptom
Direct cause
Root cause
Action
08 Leak
from
mechanical
seal
Poor contact of
sliding surfaces
Faulty assembly of
parts
Human error
Disassemble, replace parts and
reassemble.
Use assembly check sheet to
ensure confirmation.
09 Squeaking During
initial
period
after exchange for
new mechanical
seal, squeaks may
be heard from
sliding surfaces
until they fit
together.
As the sliding
surfaces are very
hard and dense,
they need time to fit
together.
Squeaking itself does not cause
leak from seal or deterioration in
sealing function.
Normally, squeaking is heard for
several dozens of hours, however, it
may last longer in rare cases.
→
In this case, contact our service
center.
10 Capacity
control
position is
indicated
incorrectly.
Inaccurate reading
of compressor
indicator gauge.
Screw for securing
indicator needle is
loose.
Manually operate the compressor's
capacity control to indicate 0%
position, and tighten the screw
again.
Indicator's bevel
gear is worn.
If deteriorated over time, replace.
If the wear is caused by excessive
vibration of the compressor, take
measures to reduce vibration and
then replace the gear.
Inaccurate reading
of capacity control
indicator on the
control panel.
The cam groove of
compressor's
indicator cam is
worn.
Often caused by continued
operation with load on a certain
point.
→
Replace the indicator cam.
* The currently shipped indicator
cam has its grooved portion
strengthened.
The guide pin
(dowel pin) of the
compressor push
rod is worn.
Currently, this pin is also improved
in resistivity against wear. If the
indicator cam is replaced with the
improved version, replace the pin
with the countermeasure part.
Failure of
potentiometer
If the part is deteriorated over time
or loaded at a certain point during
operation for a long time, replace it.
If the wear is caused by excessive
vibration of the compressor, take
measures to reduce vibration and
then replace the gear.
Improper zero span
adjustment of E/E
positioner
Readjust.
E/E positioner
or/and indicator is
faulty.
If deteriorated over time, replace.
If there are specific causes such as
surge current, remove the cause or
take proper action.
Loosened terminals
or defective wires
Tighten the terminals if loosened.
Replace defective wires.
11
Capacity
control
malfunction
↑
See the causes
for "Inaccurate
reading of capacity
control indicator on
the control panel".
Same as left
Same as left
