RXB PLUS ROTARY SCREW COMPRESSOR UNITSS70-101 IOM
Page 20
OPERATION
Compressor Differential Cutout - The differential cutout
has been lowered from 55 lb to 25 lb. Cutout will occur after
five minutes. To allow operation at low differential pressures,
the micro will take the following steps:
A. Force unload the compressor to 50% and display an "F
Unload" when the oil pressure is within 10 lb of the main oil
injection port pressure and the slide valve position is greater
than 50%.
B. Prohibit the compressor from loading and display a "Ld
Inhib" message when the differential is within 15 lb of the
main oil injection port pressure.
Oil Pressure Alarm and cutout - Prelube and Cycling Oil
Pump version when pump is not running. Alarm will occur if
oil pressure is 25 lb below discharge pressure or within 10
lb of suction pressure for 30 seconds. Cutout occurs if oil
pressure is 30 lb below discharge pressure or if oil pressure
is within 7 lb of suction pressure for 10 seconds and alarm
has already been set.
Full Lube and Cycling Oil Pump version when oil pump is
running. Alarm occurs if oil pressure is within 10 lb of dis-
charge pressure for 30 seconds. Cutout occurs when oil
pressure is within 5 lb of discharge pressure for 10 seconds
and oil pressure alarm has been set.
Cycling Oil Pump Control - The oil pump will cut off when
differential pressure between suction and discharge pres-
sure is 55 lb or greater. Upon pump termination the above
cutout logic (pump not running) is utilized. Pump cut-in oc-
curs when the differential pressure between suction and dis-
charge is 45 lb or less. Oil pressure alarm and cutout logic
(pump running) begins after a 30 second delay which al-
lows the oil pump to build pressure.
Prealarms are self-clearing. At this time the alarm will stop
flashing, but the time of the first occurrence will still be re-
corded to the right of the alarm. Pressing the [CLEAR] key
while at the Annunciator display will clear all alarms and/or
cutouts.
In order to restore the Annunciator display and resume nor-
mal operation it will be necessary to go through the follow-
ing steps:
1. Correct the conditions causing the alarm.
2. Press the [ALARM SILENCE] key. (This action may pre-
cede correcting the conditions causing the alarm).
3. To clear or reset the Annunciator pages, press the
[CLEAR] key. This will also clear the ALARM or CUTOUT
indicator from the Operating display.
4. Press [F1] to call up the Operating display. If the condi-
tions causing the alarm have not been corrected or a new
fault has occurred, a new ALARM or CUTOUT message
will appear.
NOTE: Use of the Emergency Stop Button may trip one
or more alarm setpoints.
SHUTDOWN RECORD DISPLAY *
SHUTDOWN RECORD P1 Thu 03-01-89 15:33:36
Hi Oil Temp Cutout *********************
Hi Oil Temp Cutout *********************
Low Temp Cutout *********************
*Display for illustrative purposes only.
SHUTDOWN RECORD P2 Thu 03-01-89 15:33:36
Low Temp Cutout *********************
Disch. Temp Cutout *********************
Disch. Temp Cutout *********************
The Shutdown Record display keeps a record of the last six
shutdowns (cutouts). This information will help troubleshoot
persistent operational problems. The most recent cutout will
appear on the top line of page 1 of the display with the old-
est appearing on the last or bottom line of page 2. When a
cutout occurs, all information is moved down one line and
the new cutout appears at the top of page 1. When the dis-
play is full, the oldest record is dropped off the display and
is not retained in memory. The information presented is ech-
oed from the Annunciator display, providing the type of cut-
out, the day, the date, and the time. NOTE: This informa-
tion will not be lost due to power failure.
FREEZE DISPLAY *
FREEZE DISPLAY P1 Thu 03-01-89 15:33:36
Suction Disch Oil CUTOUT Compressor
14.3 hg 120 g 060 g OFF Mode
-040 F 135 F 135 F
FREEZE DISPLAY P2 Thu 03-01-89 15:33:36
V Ratio SV Pos Pump %FLA Sep 132
O
F
2.2 000% off 000% HTR off
Auto Auto L
The Freeze display has the same appearance and contains
the same information as the Operating display. (For a de-
scription of the information presented by the Freeze display,
refer to the Operating display.) The Freeze display freezes
the information of the Operating display AT THE MOMENT
OF A COMPRESSOR CUTOUT. The information on the
Freeze display can help the operator to identify the cause of
a fault which occurred when no one was present. The Freeze
display will retain the information generated by a cutout until
a new cutout occurs or power is removed from the micro-
processor.
Do not confuse the Freeze display
with the Operating display. In or-
der to avoid confusion remember
that the displayed information on the Operating display
is constantly being updated and changed. The Freeze
display is fixed and FREEZE DISPLAY appears in the
upper left hand corner of the display.
NOTE: The Freeze display will appear as a blank screen
when power is initially furnished to the unit, and it will
return to a blank screen anytime power is removed from
the microprocessor.
SECURITY DISPLAY *
SECURITY DISPLAY Press F2 To Exit
Setpoints Access ---- [Enabled ] Keyboard
Enter Access Code - [*****]
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