Sullair TS32 Series, Руководство оператора и список запасных частей

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Section 5
COMPRESSOR SYSTEMS
24
WA R N I N G
!
DO NOT remove caps, plugs, and/or other com-
ponents when compressor is running or pressur-
ized.
Stop compressor and relieve all internal pres-
sure before doing so.
Fluid is added to the sump via a capped fluid filler
opening, placed low on the receiver tank to prevent
overfilling of the sump. A sight glass enables the
operator to visually monitor the sump fluid level.
5.7 CONTROL SYSTEM, FUNCTIONAL DESCRIP-
TION
R e f e r t o F i g u r e s 5 --- 8 a n d 5 --- 9 . T h e p u r p o s e o f t h e
compressor control system is to regulate the
amount of air being compressed to match the
amount of compressed air being used.
The capacity control system consists of a spiral
valve and an inlet butterfly valve. The functional de-
scription of the control system is described below
in 4 distinct phases of compressor operation. The
following applies to all TS---32 Series compressors
ranging from 200 through 600HP/150 through
450KW models. For explanatory purposes, this de-
scription applies to any compressor with an operat-
ing range of 100 to 110 PSIG (6.9 to 7.6 bar). A com-
pressor with any other pressure range would oper-
ate in the same manner except for the stated pres-
sures.
START MODE --- 0 TO 50 PSIG (0 TO 3.4 bar)
When the compressor ON/OFF pad is depressed,
the sump pressure will quickly rise from 0 to 50
PSIG (0 to 3.4 bar). During this period, both of the
pressure regulators and the solenoid valve are
closed and the Sullicon Control and spiral valve are
inoperative. The spring on the control holds the
butterfly valve fully open while the spiral valve is ful-
ly closed (maximum) position and the compressor
pumps at full rated capacity. The rising compressor
air pressure is isolated from the service line in this
phase by the minimum pressure valve set at ap-
proximately 50 PSIG (3.4 bar).
FULL LOAD MODE --- 50 TO 100 PSIG (3.4 TO 6.9
bar)
When the compressed air pressure in the sump
rises above 50 PSIG (3.4 bar), the minimum pres-
sure valve opens, allowing compressed air to flow
into the service line. From this point on, the line air
pressure is continually monitored by the Supervi-
sor. The pressure regulators and the solenoid valve
remain closed during this phase, keeping the Sulli-
con Control and spiral valve inactive. Both the spi-
ral valve as well as the inlet butterfly valve remain in
the full load position as long as the compressor is
running at 100 PSIG (6.9 bar) or below.
MODULATION --- 100 to 110 PSIG (6.9 TO 7.6
bar)
As air demand drops below the rated capacity of
the compressor, the line pressure will rise above
100 PSIG (6.9 bar). As a result, the differential pres-
sure regulator for the spiral valve gradually opens,
applying air pressure to the spiral valve actuator. Air
pressure at the actuator expands the diaphragm.
The rack, in turn, engages with the pinion mounted
on the spiral valve shaft assembly. This results in a
rotary motion. As the spiral valve rotates, it starts
opening the bypass ports gradually. Excess air is
then being returned back internally to suction end
of compressor unit. Now the compressor is fully
compressing only that amount of air which is being
used. As air demand keeps dropping further, the
spiral valve keeps opening more and more until all
the bypass ports are fully open. At this point, the
spiral valve has moved into the unload (minimum)
position.
The spiral valve provides a modulation range from
100 to 50%. During this period, the pressure rises
approximately from 100 to 108 PSIG (6.9 to 7.4
bar). As the air pressure exceeds 108 PSIG (7.4
bar), the differential pressure regulator controlling
the Sullicon Control opens. This allows the air pres-
sure to expand the diaphragm chamber of the Sul-
licon Control, which starts partially closing the inlet
butterfly valve. The inlet butterfly valve provides
modulation range from 50 to 40%. During this pe-
riod, the pressure rises approximately from 108 to
110 PSIG (7.4 to 7.6 bar). During this range, the spi-
ral valve remains in the unload position.
UNLOAD MODE --- IN EXCESS OF 110 PSIG (7.6
bar)
When a relatively small amount or no air is being
used, the service line pressure continues to rise.
When it exceeds 110 PSIG (7.6 bar), Supervisor
de---energizes the solenoid valve allowing line
pressure to be supplied directly to the Sullicon dia-
phragm keeping the inlet butterfly closed; the spiral
valve is in the fully open (minimum) position. Simul-
tateously, the solenoid valve sends a pneumatic
signal to the blowdown valve. The blowdown valve
opens the sump to the atmosphere. This reduces
the sump pressure to approximately 30 (water---
cooled) to 50 (air---cooled) PSIG (2.1 to 3.4 bar)
which results in low horsepower consumption. The
check valve in the air service line prevents line pres-
sure from returning to sump while the compressor
is running in the unloaded mode. Both the spiral
valve and the butterfly valve remain in the unload
position.
When the line pressure drops back to 100 PSIG
(6.9 bar) due to an increase in the air demand, Su-
pervisor energizes the solenoid valve allowing the
air pressure behind the Sullicon Control to be
vented through the solenoid valve exhaust port.
The blowdown valve closes, and the inlet butterfly
valve opens. Also the air pressure at the spiral valve
actuator diaphragm is reduced through a vent hole
at the spiral valve differential pressure regulator,