Instruction Manual
W32- Series Medium-Vertical Compressors
Page I - 10.
I – 8. Description of Controls
Compressor Controls : The W32 Series compressor
may operate with the following two controls :
1. Automatic Start – Stop Control : This is the
standard control type for all
single pressure
compressor
systems. With this type of control, once the
compressor is manually started, it will run till it reaches
the high set pressure where is will automatically stop
(the pressure where the motor will cut-out); after the
pressure drops to the low set-pressure (the pressure
where the motor will cut in), it will automatically re-
start. This control system is standard on all
single
pressure
compressors.
2. Manual Start – Automatic Stop Control: This
control is used on compressors with
dual pressure
controls. The dual pressure systems have two cut out
pressures (at which level the motor will be stopped) :
One is the low cut-out pressure (for example at this
mode, the compressor will stop at 3200 psi), the other
is the high vut-out pressure (for example 4500 psi).
With this type of control, the compressor will always
have to be started manually; there is a valve on the
filling panel which allows the operator to select
between low and high pressure cylinder filling
depending on the type of cylinders being filled. If the
lever is at the “high pressure” mode, the pressure
switch wil sense the high pressure and will cut out at
that pressure (for example at 4500 psi). When the
lever is set to the low pressure mode, an electro-
pneumatic valve will be activated, enabling the low cut-
out pressure circuit of the pressure switch to control
the system; when the low cut out pressure (in this
example 3200 psi) is reached, the pressure switch will
cut out the motor.
In the illustration on the right hand side, the red
needle indicates the high cut out pressure control hand
(showing 340 bars), and the black indicates the low
pressure cut our pressure control hand (showing 230
bars).
Pressure Swtichgage : The W32 series compressors
are controlled by a pressure switch that cuts off the
motor control line when the operating set pressure is
reached; it cuts in when the pressure drops below the
pre set low pressure limit, starting the motor again. On
diesel engine driven compressors, a constant speed
control system is added to the package; this includes
head and discharge unloaders for the compressor unit,
and an unloading system which allows the compressor
to run without compressed air.
100
300
200
400
0
Fig. 6 Pressure switch gage
Instrument & Control Panel – The instrument panel layout is shown in the following illustration.
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O N L Y Q U A L IF IE D P E R S O N N E L
S H O U L D B E A L L O W E D T O
O P E R AT E A N D /O R M A I N T A I N
T H I S C O M P R E S S O R
R E A D T H E I N S T R U C T I O N S
M A N U A L B E F O R E IN S T A L L IN G ,
O P E R AT IN G A N D M A IN T A IN IN G
T H IS C O M P R E S S O R
B E W A R E O F E L E C T R IC A L
S H O C K , H O T S U R F A C E S ,
M E C H A N I C A L IN JU R Y, H I G H
A I R P R E S S U R E
D O N O T O P E R AT E T H I S
M A C H IN E W I T H O U T T H E
E N C L O S U R E
O N -O F F S W IT C H
O
M A IN S W IT C H
0 0 0 0 0
0 0
h
l e g ra n d
H O U R M E T E R
E M E R G E N C Y
S T O P
0
0
10
10
ba r
ba r
0
0
60
40 0
ba r
ba r
100
300
400
200
0
GAGE
GAGE
GAGE
GAGE
GAGE
BUTTON
PRESSURE
SWITCH
PRESSURE
PRESSURE
OIL
PRESSURE
2nd STAGE
1st STAGE
MAIN
SWITCH
HOURMETER
PRESSURE
STOP
SWITCH
3rd STAGE
EMERGENCY
ON-OFF
VALVES
FILLING
#7895
Fig. 7
Instrument & Control panel
