SECTION 4500P-7500 USER MANUAL
21
keys. For example, to change language from normal
view, press the Up arrow pad once, press the Enter
key , select your language, and press Enter
again. The number of displays varies with
compressor model, but will follow this pattern.
The Emergency Stop button located near the
controller overrides all electronic functions to turn off
the control devices. The controller senses this, and
will display E-stop. To reset, twist and pull out the
Emergency Stop button, then press the Stop pad to
reset the WS Controller.
2.9 LED LIGHTS
The four LED lights indicate the general condition of
the machine.
The green Power indicator indicates power is
applied to the controller. It will blink at a noticeably
slow rate if the WS Controller is set up to
automatically restart after power failure.
The green Run mode indicator indicates
compressor operation is enabled. It lights steadily if
the motor is running. If the motor stops while in
Automatic mode, this LED will blink to indicate that
the motor may restart.
The yellow Maintenance indicator comes on
whenever there is recommended maintenance or a
warning. The text display will periodically indicate the
recommended actions or the cause of the warning.
The red Fault indicator indicates that a
compressor fault has occurred and needs to be
repaired before further operation. The text display
will indicate the cause of the fault.
The PC support program for the WS Controller
provides additional information about compressor
operation and advanced setup adjustments to
optimize operation.
Software part numbers are shown in the display
following a power interruption or other interruption of
communication with the controller. The P/N remains
on the display until satisfactory communications are
established with the Input/Output module.
2.10 VARIABLE SPEED DRIVE
(VSD) COMPONENTS
The VSD, located in the machine’s electrical
enclosure, works in concert with the WS Controller to
allow the compressor to match its output to the
current demand on the system. The drive’s heat sink
extends through the back of the enclosure, and is
cooled by air flowing through the compressor
enclosure.
2.11 VSD CONTROL SYSTEM -
FUNCTIONAL DESCRIPTION
Refer to Figure 2-5. The controls consist of:
• a VSD
• a solenoid valve
• a regulating valve
• and an inlet valve.
Depending on the model, a compressor can be
operated at a setpoint pressure from 60 to 175 psig
(4.1 to 12.1 bar). The WS Controller automatically
sets the frequency range based on the selected
pressure. (The compressor’s operating range is on
its nameplate.)
The following paragraphs apply to a compressor with
a 100 psig (6.9) operating pressure and a 6 psi (0.4
bar) load delta setting.
Compressors with different pressure operating
ranges perform in the same manner.
START MODE - 0 TO 50 PSIG (0 TO 3.5 BAR)
Pressing the WS Controller START button (1) signals
the VSD to accelerate the motor to full speed,
causing the receiver tank pressure to rise from 0 to
50 psig (0 to 3.4 bar). At this time both the pressure
regulator and solenoid valves are closed; the inlet
valve is fully open and the air-end provides a full flow
to the receiver tank. A minimum pressure valve set at
approximately 50 psig (3.4 bar) isolates the rising
compressor air pressure from the service line.
FULL LOAD MODE - 50 TO 100 PSIG (3.4 TO
6.9 BAR)
When the compressed air pressure rises above 50
NOTE
Sections 2-10 and 2-11 apply only to
compressors equipped with a Variable Speed
Drive.
NOTE
The load delta default setting is 10 psi (0.7 bar).
Sullair recommends a setting of 6 psi (0.4) for the
most efficient operation.
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