Dryer Set Points And Alarms; Adjusting Set Points; Alarms And Their Functions - Ingersoll Rand Nirvana NVC2000 A400 Manual Del Operador

7.6.3

DRYER SET POINTS AND ALARMS

The Microprocessor Control has several user adjustable set
points that are displayed at the end of the display parameter
list. These set points allow the user to configure the dryer to
operate according to site conditions. The controller is shipped
from the factory with each parameter having its own default
value. The following chart summarizes the parameters that
may be adjusted by the user:
Display
Description
SETPOINT
Chiller Off Temperature CHLLR TEMP
7.6.4

ADJUSTING SET POINTS

Accessing and manipulating each of the set points in the
CUSTOMER MODE is accomplished as follows. The
parameter is selected using the SELECT DISPLAY button.
After scrolling through the displays, the "Cust Set Points"
screen is displayed. The parameters after this screen may be
adjusted by the user.
displayed, depressing the "+/-" button changes the set point.
Once the new set point is displayed, depressing ENTER
saves the set point. Exiting the Customer Set Point routine is
accomplished by depressing the SELECT DISPLAY button
until the END CUST SET PTS screen is displayed. The
following example illustrate the keystrokes required to change
the Chiller Temperature Set Point from 36 F to 38 F.
SELECT
CHLLR TEMP:
DISPLAY
Pressing SELECT DISPLAY will increment the display through the
available display parameters.
SELECT
Cust Set Points
DISPLAY
Continue pressing SELECT DISPLAY until the Customer Set point
screen is displayed. The parameters that follow are the User
Adjustable Parameters for the controller.
SELECT
CHLLR TEMP:36
DISPLAY
Press SELECT DISPLAY until "CHLLR TEMP" is displayed.
CHLLR TEMP:38
+
-
Depress " + / -" as required to change the CHLLR TEMP to 38
degrees.
CHLLR TEMP:38
ENTER
Pressing "ENTER" saves the set point.
8
7.0 PRINCIPLES OF OPERATION
Parameter Factory Setpoint
Range Nirvana
Cycling
32°F - 50°F; 1 °F increments 34°F
Once the desired parameter is
36
Nirvana Cycling Refrigerated Dryer Models 2000-2400
ingersollrandproducts.com
SELECT
End Cust Set Pts
DISPLAY
Press SELECT DISPLAY as necessary to display the End
Customer Set points Screen.
SELECT
CHLLR TEMP:
DISPLAY
Press SELECT DISPLAY
Microprocessor Control to the desired display parameter.
7.6.5

ALARMS AND THEIR FUNCTIONS

There are several alarms detected by the Microprocessor
Control to alert the user of an out of tolerance condition. Once
each alarm is detected, a description of the alarm will appear
in the screen and the remote alarm contact will close. Note
that during the alarm condition, the SELECT DISPLAY button
may be depressed to scroll through the available parameters.
After approximately 30 seconds, the alarm screen will
reappear, provided the alarm condition persists.
Alarm
Display
HIGH PRESSURE CUTOUT HI PRESS CO
LOW PRESSURE CUTOUT LO PRESS CO
HIGH TEMPERATURE ALARM HITEMP ALRM
LOW TEMPERATURE ALARM LOTEMP ALRM
The alarm names and a brief description of each are described in detail
below.
HIGH TEMPERATURE ALARM (HITEMP ALARM)
When the thermal mass (glycol) temperature in a Nirvana™ Cycling
dryer reaches the factory alarm set point, after an alarm delay, the
alarm will be activated. This alarm condition may not necessarily
damage the dryer when subjected to long-term exposure. It may,
however, have a significant impact on downstream processes and thus
should be investigated upon detection. Note that this alarm will not
shut down the dryer. This alarm will activate the remote alarm contact
and reset automatically once the alarm condition is rectified.
LOW TEMPERATURE SAFETY ALARM (LOWTEMP ALARM)
If the dryer chiller temperature falls to or below the factory set point and
remains at or below this set point for the factory delay time, the alarm
routine will activate. This alarm condition may cause damage to the
dryer when subjected to continuous or long-term exposure. Note that
this alarm will shut down the dryer after a response time delay. This
alarm will activate the remote alarm contact and reset automatically
once the alarm condition is rectified.
HIGH PRESSURE CUTOUT ALARM (HPCO ALARM)
If the discharge pressure of the refrigerant is determined to be above
the set point, the alarm routine will activate. This alarm condition may
cause damage to the dryer when subjected to continuous or long-term
exposure. Note that this alarm will shut down the dryer after a
response time delay. The operator must depress the RESET button in
order to clear the alarm and restart the refrigeration system.
36
as necessary to return
Alarm Set Point
See Table 1
See Table 1
55 °F
30 °F
the