mycom 2016 C Series Instruction Manual page 118

Symptom
08 Leak from Poor contact of
mechanical sliding surfaces
seal
09 Squeaking During initial period
after exchange for
new mechanical
seal, squeaks may
be heard from
sliding surfaces
until they fit
together.
10 Capacity Inaccurate reading
control of compressor
position is indicator gauge.
indicated
incorrectly.
Inaccurate reading
of capacity control
indicator on the
control panel.
11 Capacity ↑ See the causes
control for "Inaccurate
malfunction reading of capacity
control indicator on
the control panel".
Compound 2-stage Screw Compressor 2016**C
Direct cause
Faulty assembly of
parts
Human error
As the sliding
surfaces are very
hard and dense,
they need time to fit
together.
Screw for securing
indicator needle is
loose.
Indicator's bevel
gear is worn.
The cam groove of
compressor's
indicator cam is
worn.
The guide pin
(dowel pin) of the
compressor push
rod is worn.
Failure of
potentiometer
Improper zero span
adjustment of E/E
positioner
E/E positioner
or/and indicator is
faulty.
Loosened terminals
or defective wires
Same as left
Root cause
Disassemble, replace parts and
reassemble.
Use assembly check sheet to
ensure confirmation.
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.
Manually operate the compressor's
capacity control to indicate 0%
position, and tighten the screw
again.
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.
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.
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.
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.
Readjust.
If deteriorated over time, replace.
If there are specific causes such as
surge current, remove the cause or
take proper action.
Tighten the terminals if loosened.
Replace defective wires.
Same as left
6-7
2200LZJE-HO-C6-N_2013.12.
Chapter 6 Troubleshooting
Action