RWB II PLUS MICROPROCESSOR CONTROL
OPERATION
S70-200 OM
Page 10
Sensor Fault Failure - A “Sensor Fault” cutout was added
to the program to stop the compressor if a temperature or
pressure sensor is at its minimum or maximum limit for 5
seconds. The following channels and conditions will cause
this cutout:
Channel 1 - Suction Temp Low or High (-67 to 113
O
F)
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 or High Separator Temp (0 or 180
O
F)
Channel 6 - Low or High Oil Pressure (<0 g or 285 g)
Channel 8 -
Low or High Discharge Pressure (<0 g or 285 g)
Channel 9 - Low Suction Pressure (29 hg only)
Pulse Load Signal at 100% Slide Valve Position - This
new feature will stop loading the compressor when 100%
slide valve is displayed. The load signal will pulse for 2 sec-
onds every minute when the slide valve is at 100% and the
pressure is above setpoint.
TEMPERATURE-PRESSURE CONTROL
PROGRAM (OPTION)
NOTE: The following displays are provided only when
the Temperature-Pressure Control Program option has
been ordered with the RWB II Plus Rotary Screw Com-
pressor Unit.
SETPOINTS DISPLAY PAGE 1 *
SETPOINTS PAGE 1 Capacity Control=Press
C.C. CUTOUT ALARM PB DB CT
Press 25.3g 01.3g 05.3g 10 1.0 10
Temp +40.0F +32.0F +33.0F 10 0.5 10
offset-act
Sup Heat-Alarm-10F-no
Sep Cond-Alarm-10F-no
* Display for illustrative purposes only.
The Setpoints Display is accessed by pressing the
[CHANGE] key.
CONTROL - This setpoint is used to select either Pressure
Capacity Control or Temperature Capacity Control. NOTE:
There are only two setpoints, press for pressure capac-
ity control and temp for temperature capacity control.
CC - The capacity control setpoint is for normal operation,
not setback.
CUTOUT -This setpoint will stop the compressor if the suc-
tion pressure drops below the pressure setpoint for 90 sec-
onds or if the CC Temperature drops below the temperature
setpoint. There is no time delay on the temperature cutout.
ALARM - An alarm will be activated if the suction pressure
drops below the pressure setpoint or if the CC Temperature
drops below the temperature setpoint. There is no time de-
lay for either.
PB - The Proportional Band (PB) 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 or temperature is. The smaller the number, the more
load/unload will be sent. A PB of 10% is default. It is adjust-
able to 2, 5, 10, 15, 20, or 25 percent.
DB - The Dead Band (DB) is a + (plus) or - (minus) value
above or below the setpoint which the compressor will nei-
ther load nor unload. It is adjustable between .5 and 5.0
psig or degrees, in increments of .5 units.
CT - The Cycle Time (CT) setpoint is the amount of time
between the beginning of each load/unload response. It is
adjustable to 5, 10, 15, 20, 25, or 30 seconds.
Use the [STEP] key to step to the desired setpoint, then
press the [CHANGE] key to change the CC, PB, DB and CT
values. Enter the desire value for the remaining setpoints
and press [ENTER] when complete.
ADJUSTABLE SETPOINTS FORM
ADJUSTABLE SETPOINTS: ID = [ ] [ - - ]
Cap. Control ———[ ] Thu [ : : ]
Lo Suct Cutout ——[ ] Baud ———————[ ]
Lo Suct Alarm ———[ ]
Hi Disch Cutout ——[ ] Aux 1 [ ] [ ]
Hi Disch Alarm ——[ ] Aux 2 [ ] [ ]
M.L.C. Stop Load —[ ] CT Factor ———[ ]
M.L.C. Force Unld —[ ] Recy. Delay ——[ ]
Photocopy and fill in applicable data for your unit. Retain for reference if reentry is required.
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