RXF PLUS MICROPROCESSOR CONTROL PANEL S70-401 IOM
Page 9
LPCO - The Low Suction Pressure Cutout, reported in
pounds per square inch gauge (G) or inches of mercury
(
H
g
)
,
will shut down the compressor if the suction pressure drops
to this limit or lower, for 90 seconds or longer.
LPA - The Low Suction Pressure Alarm, reported in pounds
per square inch gauge (G) or inches of mercury (
H
g
), will
trigger a prealarm if the suction pressure drops to this limit
or lower.
SETPOINT DISPLAYS, Page 3*
TEMP CC LTCO+///./F
+///./F LTA +///./F
CC - The capacity control setpoint is for normal temperature
control operation, not setback.
CCSP - The Capacity Control Setpoint, reported in
O
F, con-
trols the loading and unloading of the compressor when S.V.
is in the automatic (AUTO) mode and press control mode is
selected.
LTCO - This setpoint will stop the compressor if the CC Tem-
perature drops below the setpoint. There is no time delay
on the temperature cutout.
LTA - An alarm will be activated if the CC Temperature drops
below the setpoint. There is no time delay on the tempera-
ture alarm.
SETPOINT DISPLAYS, Page 4*
PRESS PB DB CT
// /./ //
SETPOINT DISPLAYS, Page 5*
TEMP PB DB CT
// /./ //
Deadband - This setpoint is a + (plus) or - (minus) value
above or below the setpoint at which the compressor will
neither load or unload. A “Dead band” of 1 is the default
value. It is adjustable between .5 lb to 5.0 lb in increments
of .5. Use the [Step] key to select this setpoint then press
the [Change] key to toggle through the available selections.
Proportional Band - This setpoint is used to determine the
amount of time the load/unload solenoid is energized, ac-
cording to how far away from the setpoint the actual control
pressure is. The smaller the number the longer a load/un-
load signal will be sent. A “Prop. Band” of 10% is the default
value. It is adjustable to 2, 5, 10, 15, 20, or 25 percent. Use
the [Step] key to select this setpoint then press the [Change]
key to toggle through the available selections.
Cycle Time - The cycle time setpoint is the amount of time
between the beginning of each load/unload response. A
“Cycle Time” of 10 sec is the default value. It is adjustable to
5, 10, 15, 20, 25, or 30 seconds. Use the [Step] key to se-
lect this setpoint then press the [Change] key to toggle
through the available selections.
SHUTDOWN DISPLAYS, Top Page*
SHUTDOWN: USE STEP
KEY TO CHANGE PAGES
The Shutdown Record display keeps a record of the last six
shutdowns (cutouts). This information will help troubleshoot
persistent operational problems. When a cutout occurs, all
information is moved down one page and the new cutout
appears at the top of page 2. When the display is full, the
oldest record is dropped off the last display and is not re-
tained in memory. The information presented is echoed from
the Annunciator display, providing the type of cutout, the
day, the date, and the time. NOTE: This information will
not be lost due to power failure.
FREEZE DISPLAYS, Top Page*
FREEZE: USE STEP
KEY TO CHANGE PAGES
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 dis-
play, 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 microprocessor.
CAUTION: Do not confuse the Freeze display with the
Operating display. In order to avoid confusion remem-
ber that the displayed information on the Operating dis-
play is constantly being updated and changed. The
Freeze display is fixed.
NOTE: The Freeze display pages will appear as blank
screens when power is initially furnished to the unit,
and it will return to a blank screen anytime power is
removed from the microprocessor.
SETPOINT DISPLAYS, Page 1*
CAPACITY CONTROL
MODE = ///////////
MODE - This setpoint is used to select either Pressure Ca-
pacity Control or Temperature Capacity Control. NOTE:
There are only two setpoints, "PRESSURE" for pressure
capacity control and "TEMPERATURE" for temperature
capacity control.
SETPOINT DISPLAYS, Page 2*
PRESS CC LPCO=//./G
///./G LPA =//./G
CCSP - The Capacity Control Setpoint, reported in pounds per
square inch gauge (G) or inches of mercury (
H
g
), controls the
loading and unloading of the compressor when S.V. is in the
automatic (AUTO) mode and press control mode is selected.
OPERATION
* Display for illustrative purposes only.
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