The Industrial Screw
Compressor has found a home in the process gas, gas
lift and refrigeration fields. Good Screw Compressor
designs require special controller algorithms to allow
the compressor and its prime mover to operate at full
potential. Efficient Capacity Control synchronized
with Engine Load and proper Alarm Monitoring are key
ingredients to achieving maximum throughput and reducing
maintenance
costs. 
Micro-Design controllers are designed specifically
with this in mind. They incorporate all of the unique
features required, but never available, for the O
E M or Compressor Packager. Micro-Design has developed
this new standard for screw compressor control by
combining the power of the NP 60-microprocessor board,
which includes more than 96 I/O points on a single
board. This software is very comprehensive and includes
20 years of compressor control experience to allow
the user to configure the controller to fit most applications
by simply setting the set points and other start/stop
sequence parameters thus giving the end user the ability
to customize the compressor program to fit any particular
needs without having to Send for a new chip from the
factory”.
The standard NP-60 screw compressor controller comes
with a preloaded program. This program includes the
ability to address all set points, and to activate
or deactivate each point, as they relate to your particular
application. The standard preloaded software can be
configured to operate motor drives or engine drives.
The program includes the ability to load and unload
a compressor based on pressures, flows or time with
override for prime mover” overload via engine
manifold pressure or motor amp draw.
With Manifold override and our special “Spy-Features”
the operation of a package becomes trouble–free.
The NP- 60’s will keep you running even if minor
system upsets occur which can easily knock out the
controller on false alarms. Automatic Start/Stop can
be controlled either by Suction Pressure or remotely
by other equipment such as Plunger Lift controls,
SCADA Systems, etc. Governor control and Air-Fuel
Ratio are optional features that can be easily added
to the system.
All controllers include easy-toread digital displays.
The display continually scrolls to show user selected
screens. This feature allows quick and simple viewing
of all conditions and set points. Set point changes
are easy to enter via the front keypad. Set point
security can be set as required. The panel also includes
throttle control, and operating switches such as start,
stop, reset, manual, auto, test, etc.
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