RXF PLUS MICROPROCESSOR CONTROL PANEL S70-401 IOM
Page 13
ANALOG OFFSET DISPLAY, Page 4*
SUCT SPARE TEMP
+/ +/./ ///./F
DISCH OIL SEP TEMP
+0 +0 +2
All analog values can be offset + or - 5 units, depending on
which value is being adjusted. Use the [STEP] key to step
through the desired setpoint. Press the [CHANGE] key to
change the value of the offset by 1. The actual analog value
will be displayed under the word “PRESS” or “TEMP”.
COMMUNICATIONS DISPLAY*
COM IN:
## OUT:
COM IN - Displays character which the microprocessor has
received in the RS-422 communications port.
COM OUT - Displays the first 12 characters of information
which the microprocessor has transmitted out the RS-422
communications port.
## - Displays the number of characters the microprocessor
has received after a "#" character.
ADDITIONAL FEATURES
Compressor Differential Cutout - If the compressor runs for
5 consecutive minutes with a suction to discharge pressure
differential of 25 pounds or less, then the “Comp Differen-
tial” cutout occurs. The ability to run the compressor at a
low differential pressure required the following changes to
ensure oil flow at the main oil injection port.
a. The compressor will force unloaded to 50% slide valve
and display an “F Unload” message when the following
condition is true:
((suction pressure (PSIA) x 1.5) + 10) - 14.7 >= Oil
Pressure and slide valve >50%
b. The compressor will be prohibited from loading and
display a “Ld Inhib” message while the following condi-
tion is true:
((suction pressure (PSIA) x 1.5) + 15) - 14.7 <= Oil
Pressure
Sensor Fault Failure - A “Sensor Fault” cutout was added
to the program to stop the compressor if a temperature or
pressure sensor is determined to be at it’s minimum or maxi-
mum limit for 5 seconds. The following channels and condi-
tions can cause this cutout:
Channel 2 - Low or High Discharge Temp (32 or 212
O
F)
Channel 3 - Low or High Oil Temp (0 or 180
O
F)
Channel 4 - Low Separator Temp (0
O
F)
Channel 6 - Low or High Oil Pressure (<0g or 285g)
Channel 8 - Low or High Discharge Pressure (<0g or
285g)
Channel 9 - Low Suction Pressure (29
H
g
only)
Pulse Load at 100% slide valve position - A new feature
has been added which will stop loading the compressor at
the normal rate when 100% slide valve is displayed. The
load signal will then be pulsed for 2 seconds every minute
when the slide valve is displaying 100% and the pressure is
above the setpoint.
1 TO 4 STEP CONDENSER CONTROL
The following information pertains to the RXF PLUS micro
with the condenser control feature option. The SETBACK
feature is removed to allow for the addition of the condenser
control programming. Pressing [F3] will take the operator
directly to the condensers main operating status menu. The
condenser feature uses three menus.
CONDENSER PRES /// G
1-ON 2OFF 3OFF 4OFF
Main condenser status menu, first page.
ON /// DELAY /// SEC
OFF /// LEAD STEP 1
Condenser menu, second page.
ACTIVE WHEN RUNNING
ACTIVE STEPS 1-3
Condenser menu, third page.
The first condenser page displays the current discharge pres-
sure and the current output status of up to four possible
steps of condenser control. This menu displays status only
and does NOT have any programmable setpoints.
Page 2 has four setpoints:
ON 160 DELAY 030 SEC
OFF 150 LEAD STEP 1
This represents the setpoint at which the micro will sequence
on additional steps of condenser capacity.
ON 160 DELAY 030 SEC
OFF 150 LEAD STEP 1
This represents the setpoint at which the micro will sequence
off steps of condenser capacity.
ON 160 DELAY 030 SEC
OFF 150 LEAD STEP 1
This represents the setpoint which determines the time de-
lay to sequence steps of condenser capacity.
ON 160 DELAY 030 SEC
OFF 150 LEAD STEP 1
This setpoint allows the operator to program a given step as
the LEAD step.
Page 3 has two setpoints:
ACTIVE WHEN RUNNING
ACTIVE STEPS 1-3
This setpoint has three possible settings that determine when
the condenser control feature is active. They are: "ACTIVE
RUNNING", "ALWAYS", and "NEVER".
OPERATION
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