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13-25-608 Page 47
MISCELLANEOUS CONTROL DEVICES
- Refer to
Figure 4- 8, page 52 for the schematic diagram of the control system.
Intake [Air] Filter (1) -
Captures solid impurities in the air stream entering compressor inlet. It also attenuates
noise emitted by the compressor inlet.
Inlet-Valve Assembly (2) -
This device controls the intake of atmospheric air entering the compressor during the
Load/Unload or the optional Inlet Modulation operational phases:
·
During the loaded state: The
inlet poppet (2.2)
remains open and enables atmospheric air to enter the
compressor inlet - this is done by venting to atmosphere the gas trapped underside of the piston via
check
valve (19)
and
orifice
(18)
.
·
During the unloaded state: The
3/2-way solenoid valve (Y
) feeds pressurized air underneath the
piston
(2.1)
, forcing it and
the inlet poppet (2.2)
upward and blocking-off the compressor intake. A small purge
check valve (2.3)
, located in the poppet, allows a stream of air to reach (e.g., purge) the rotors and keep
them from unstable, noisy operation and producing sufficient pressure to maintain cooling / lubricating oil
flow. A small amount of air is dispensed by
orifice (18
) to scavenge shaft seal challenge back into the
compressor inlet. See Section 9, page 70, for maintenance information.
·
During inlet modulation state: See the segment further down on Inlet Flow Modulation Hardware Option for
details of this sub-system. Note that this option is available only for Fixed Speed package variants.
·
Electric Motor (3) –
Drives the
compressor (4)
via a
belt drive assembly (5).
It is energized by the wye-delta-
type starter, which in turn is controlled by the ASG2 controller.
Oil Sump (6) –
This pressure vessel separates by inertial effects the bulk of the compressed air and injection oil
streams and serves as a sump for the latter.
Air/oil separator (7) -
Intercepts and coalesces the aerosol oil stream in the compressed air exiting the inertial
separation process within the oil sump.
Oil Filler Cap (8) –
Oil fill port on the oil sump.
Oil drain [valve and plug] (9)
– It is the low drainage point for the oil system. It is located at the bottom of the
sump and includes a flexible hose to route drained oil unto a suitable container.
Oil Level Indicator (10) -
This gauge is located on the oil sump and indicates the oil level. See
“Oil Level Gauge”
on Section 5, Page 53, for more details.
Oil Filter (11) -
Captures solid impurities in the oil entering the compressor injection port.
Oil Cooler (12) –
The air-cooled heat exchanger removes heat from the oil stream prior to injection.
Pressure Relief Valve (13)
– This device protects the pressure containing components of the compressor
package against high pressure exceeding 188.5 psig. Section 9, See page 70, for maintenance information.
Minimum Discharge Pressure/Check Valve (14) -
This device maintains minimum pressure (60psig) within the
air/oil sump, thus ensuring adequate lubricating oil injection flow to the compressor even when no air delivery into
the system is taking place. It also functions as a check valve to prevent reversed air flow from the system line
during compressor stoppage. See Section 9, page 70, for maintenance information.
Air cooler (15) –
The air-cooled heat exchanger removes heat from the air stream prior to exit from the package.
Scavenge line orifice (16) –
This orifice controls the amount of oil and compressed air that is returned from the
air/oil separator back into the compressor.
Thermal Mixing Valve (17) –
This device mixes hot oil from the oil sump and cooled oil from the oil cooler prior to
delivery to the oil filter and ultimate injection. See Section 9, page 70, for maintenance information.
Summary of Contents for APEX25-30B
Page 11: ...13 25 608 Page 10 Figure 1 2 COMPRESSOR ILLUSTRATION VARIABLE SPEED 304USC797 01 Ref Drawing...
Page 12: ...13 25 608 Page 11 Figure 1 3 COMPRESSOR ILLUSTRATION FIXED SPEED 305USC797 01 Ref Drawing...
Page 27: ...13 25 608 Page 26 Figure 4 2 WIRING DIAGRAM VS 230 VOLT 306USC546 01 Ref Drawing Page 1 of 4...
Page 28: ...13 25 608 Page 27 Figure 4 3 WIRING DIAGRAM VS 230 VOLT 306USC546 01 Ref Drawing Page 2 of 4...
Page 29: ...13 25 608 Page 28 Figure 4 3 WIRING DIAGRAM VS 230 VOLT 306USC546 01 Ref Drawing Page 3 of 4...
Page 30: ...13 25 608 Page 29 Figure 4 3 WIRING DIAGRAM VS 230 VOLT 306USC546 01 Ref Drawing Page 4 of 4...
Page 31: ...13 25 608 Page 30 Figure 4 3 WIRING DIAGRAM VS 575 VOLT 307USC546 02 Ref Drawing Page 1 of 4...
Page 32: ...13 25 608 Page 31 Figure 4 4 WIRING DIAGRAM VS 575 VOLT 307USC546 02 Ref Drawing Page 2 of 4...
Page 33: ...13 25 608 Page 32 Figure 4 4 WIRING DIAGRAM VS 575 VOLT 307USC546 02 Ref Drawing Page 3 of 4...
Page 34: ...13 25 608 Page 33 Figure 4 4 WIRING DIAGRAM VS 575 VOLT 307USC546 02 Ref Drawing Page 4 of 4...
Page 45: ...13 25 608 Page 44 Figure 4 7 WIRING DIAGRAM FS 575 VOLT 309USC546 01 Ref Drawing Page 1 of 3...
Page 46: ...13 25 608 Page 45 Figure 4 8 WIRING DIAGRAM FS 575 VOLT 309USC546 01 Ref Drawing Page 2 of 3...
Page 47: ...13 25 608 Page 46 Figure 4 8 WIRING DIAGRAM FS 575 VOLT 309USC546 01 Ref Drawing Page 3 of 3...
Page 51: ...13 25 608 Page 50 Figure 4 8 PIPING AND INSTRUMENTATION ILLUSTRATIONJ 301USC797 C Ref Drawing...
Page 86: ...NOTES...
Page 87: ...NOTES...