Controls; Basic User Interface - Ingersoll Rand Nirvana 1000 Manual Del Operador

7.6 CONTROLS

Ingersoll Rand 2000-2400 Refrigerated Compressed Air Dryers
are equipped with the Microprocessor Control. This advanced
microprocessor-based controller has been engineered by
Ingersoll Rand exclusively for use with Ingersoll Rand
Compressed Air Dryers.
The Microprocessor Control cycles the refrigeration system
based on the dryer's Chiller Temperature. A temperature
sensor samples the thermal mass temperature as it enters
the chiller exchanger. The Chiller Temperature Set point is a
user adjustable set point that is used to set the Refrigeration
Compressor Off temperature. Once the Chiller Temperature has
fallen below the Chiller Temperature Set point, the refrigeration
compressor will de-energize. The Operating Temperature
Differential is factory set at 4 °F above the Chiller Temperature
Set point. Therefore, if a user adjusts the Chiller Temperature at
36 °F, the Refrigeration Compressor On temperature will be 40
°F.
In addition to the operation of the Nirvana™ Cycling dryers
as described above, the Microprocessor Control permits
monitoring of dryer parameters and enunciation of alarm
conditions.
The list below summarize the features the Microprocessor
Control:
•
2 X 16 Character Backlit LCD Display - Easy-to-read display
provides continuous indication of dryer default parameter.
Standard backlight permits viewing of critical information in
low light environments.
•
Remote Start / Stop: Microprocessor Control-equipped
dryers offer a unique remote start / stop feature. This feature
allows the dryer to be operated via a remote user-supplied
switch.
•
Remote Alarm Contact: Microprocessor Control-equipped
dryers include a remote alarm contact to provide indication
of any of the dryers alarms described later in this manual.
Contact rated for 2A / 120V max.
The Microprocessor Control features three levels of access. The
default level CUSTOMER MODE permits adjustment of dryer
parameters to address seasonal variations for drain timing and
pressure dew point temperature. A protected TECHNICIAN
MODE permits access to and manipulation of additional
parameters. A password protected FACTORY MODE is also
included for use with Ingersoll Rand Service Personnel for
troubleshooting the dryer.
The Microprocessor Control includes a digital readout for
monitoring the discharge pressure of the refrigerant gas
exiting the compressor. This reading will vary dependent upon
condenser type as indicated below:
•
For air-cooled applications, condensing fans are cycled
on and off by the DPC based on the refrigerant discharge
pressure. The primary fan is cycled on at 235 psig and off at
195 psig. Should the discharge pressure continue to climb
8
7.0 PRINCIPLES OF OPERATION
•
7.6.1
Nirvana Cycling Refrigerated Dryer Models 1000-1600
ingersollrandproducts.com
above 265 psig, the secondary condensing fan will cycle
on. As discharge pressure is reduced below 210 psig, the
secondary fan will cycle off.
Water cooled condensers utilize a water regulating valve
(Note Figure 2). The water regulating valve comes pre-
adjusted from the factory at 250 psig discharge pressure.
To compensate for water temperature variation, it may be
necessary to adjust the water regulating valve to maintain
a 250 psig discharge pressure. Adjustment can be done
by rotating the adjusting screw counterclockwise for an
increase in discharge pressure. For conditions where low
water temperature and/or high water pressure are expected
it is advisable to install a water pressure regulator ahead of
the condenser.
ADJUSTMENT
SCREW
FIGURE 2
WATER REGULATING VALVE

BASIC USER INTERFACE

The Microprocessor Control display provides the
user with the operating parameters and their
corresponding values. When power is supplied to the
dryer, the Microprocessor Control will illuminate and
default to the "Standby" mode, displaying the "Press
ON" prompt.
The following illustration summarizes the keypad
functions: