070.250-IOM (APR 11)
Page 20
408 MM ROTARY SCREW COMPRESSOR
MAINTENANCE
The third step is to identify the most likely cause and take
action to correct the problem. If the symptoms are not
relieved, move on to the next item on the list and repeat the
procedure until you have identified the cause of the problem.
Once the cause has been identified and confirmed make the
necessary corrections.
CAPACITY LINEAR TRANSMITTER REPLACEMENT - SLIDE
VALVE
The Capacity Linear Transmitter is located on the end of the
compressor cylinder (see Figure 12). The linear transmitter
with hermetic enclosure is based on the inductive measuring
principle. It features removable electronics (from the sensor
well) eliminating the need to evacuate the compressor for
replacement. This type of transmitter is dedicated to
capacity control and is not adjustable.
1. Shut off control power.
2. Remove DIN connector plug from transmitter.
3. Loosen cap screws.
4. Remove transmitter unit.
5. Install new transmitter unit.
6. Tighten cap screws.
7. Apply DIN connector plug to transmitter.
8. Turn on control power.
END VIEW
DIN CONNECTOR
STAINLESS STEEL WELL
HEAT ISOLATOR
CAST ALUMINUM HOUSING
COMPRESSOR UNLOAD CYLINDER
SHADED AREA SHOWS
CAPACITY LINEAR TRANSMITTER
Figure 12 - Capacity Linear Transmitter
VOLUMIZER TRANSMITTER REPLACEMENT - SLIDE STOP
The VOLUMIZER Transmitter is located on the right side of
the compressor (facing shaft) at the inlet end (see Figure
13).
Figure 13 - Volumizer Transmitter
The linear transmitter, with hermetic, enclosure is based on
the inductive measuring principle. It features removable
electronics (from the sensor well) eliminating the need to
evacuate the compressor for replacement. This type of
transmitter is dedicated to volume ratio control and has no
user adjustments.
1. Shut off control power.
2. Remove DIN connector plug from transmitter.
3. Loosen setscrews.
4. Remove transmitter unit.
5. Install new transmitter unit.
6. Tighten setscrews.
7. Apply DIN connector plug to transmitter.
8. Turn on control power.
NOTICE
For calibration of the Volumizer unit, refer to the Analog
Calibration instructions in publication 090.040-O.
BARE COMPRESSOR REPLACEMENT
The following procedure is required only when a bare
compressor is replaced in the field.
1. Verify that the starter is locked out.
2. Remove all tubing, piping, and wiring that is connected
to the compressor.
3. Disconnect the coupling from the motor shaft.
4. While supporting the compressor assembly with a
crane, remove the bolts at the compressor feet.
5. Thoroughly clean the compressor feet and mounting
pads of burrs and other foreign matter to ensure firm
seating of the compressor.
6. Thoroughly clean the new compressor and remove all
cover plates and protection etc.
7. Install new gaskets and sealing in all connections.
8. Set the new compressor in place and shim feet where
required.
9. Reattach the drive coupling.
10. Check the shaft alignment.
11. Complete tubing, piping, and wiring.
SHUTDOWN DUE TO
IMPROPER OIL PRESSURE
(High Stage and Booster)
The compressor must not operate with incorrect oil
pressure.
1. Refer to CONTROL SETUP
