Section 5
ShopTek™ ST45, ST55, ST75 (U.S.A. & Mexico) Operation & Maintenance Manual
5: Operation
88292021-240 R01
Subject to EAR, ECCN EAR99 and related export control restrictions.
29
Operation
5.1
Compressor protection features
Your ShopTek™ compressor controller optimizes the per-
formance of your system by adding additional electronic
protection to the motor and air end.
5.1.1
Stop run-on timer
This stop run-on timer provides a soft stop function,
reducing the load on the air end before stopping the com-
pressor. When you press the Stop button, the compres-
sor will unload and then run for a period of time pre-set
by the factory, reducing the pressure in the separator
tank, before coming to a complete stop.
5.1.2
Emergency stop
Pressing the emergency stop (E-stop) button will stop the
compressor immediately.
You must pull out the E-stop button to release it before
the compressor can be restarted.
5.2
Starting the compressor for the
first time
1. Read the preceding pages of this manual
thoroughly.
2. If you are installing the compressor, confirm
you have followed all the requirements and
guidelines in
Section 4.3: Compressor instal-
lation
and
Section 4.4: Connection to the air
system
.
3. Perform all mechanical checks described in
Section 4.5
.
4. Open the isolation gate valve if it is installed.
5. If you are installing the compressor, perform
the motor rotation direction check described
in
Section 4.6.2
.
6. Switch on the mains power (if it is not
already on).
7. Press the Start button.
• The compressor will start and switch from
the Y start configuration to the delta run-
ning configuration as it reaches full speed.
8. Monitor the status of the compressor on the
controller display.
• Rising discharge air pressure and rising
operating temperature indicate correct
operation (see
Section 2.1: The air com-
pression cycle
on page 15).
• On reaching the preset operating pressure,
the controller will unload the compressor
and the discharge air pressure will stop ris-
ing. The compressor will continue to run,
but it will run unloaded.
9. Run the compressor through a number of
load/unload cycles (bleed air from the plant
air system, if necessary) and check for con-
sistent operation, leaks (air or fluid), and a
stable operating temperature (see
Section
2.5: Cooling system
on page 19).
NOTE
You should always use the Stop button to stop
the compressor under normal circumstances.
You should only use the E-stop button to stop
the compressor in an emergency.
NOTE
Also follow this procedure if the compressor has
been out of service for more than 60 days or you
have installed the compressor in a new location.
CAUTION
The compressor should always run smoothly. If
the compressor vibrates excessively while run-
ning, shut it down and contact your Sullair repre-
sentative immediately.
