RWB II PLUS MICROPROCESSOR CONTROL
OPERATION
S70-200 OM
Page 6
Cycle Time - Cycle time is the amount of time between the
beginning of each load/unload response. Ten seconds is
the default value. “Cycle Time” is adjustable between 5 and
30 seconds in 5 second intervals. The “Step” key is used to
select a setpoint; then press the “Change” key to toggle
through the selections.
Low % FLA - This setpoint is used to determine if the cou-
pling has broken. 20% is the default value. It is adjustable
from 0 to 100% FLA. Use the “Step” key to select a setpoint;
then enter the desired setpoint and press the “Enter” key.
TO CHANGE THE ADJUSTABLE SETPOINTS:
Adjustable Setpoints are stored in RAM (random access
memory) and are easily changed in the field.
Adjustable Setpoints are lost if
power is interrupted and the battery
is not fully charged. To facilitate re-
entry, we suggest that a list of Adjustable Setpoints be
affixed to one end of the microprocessor cabinet for
reference. For your convenience, a blank Adjustable set-
points display which may be photocopied has been provided
(See page 10).
NOTE: The following procedure also applies to the chang-
ing of the Security, Setback, and Auto Cycle display set-
points.
1. Press the [CHANGE] key to rotate the display to the Ad-
justable Setpoints display.
2. Press the [STEP] key to move or step a set of flashing
brackets through the various setpoints. A setpoint is selected
for change or update when it is enclosed by the flashing
brackets.
NOTE: The DAY indicator, itself, will flash when selected
for change or update.
3. Having selected the setpoint to be changed, the [NU-
MERIC KEYPAD] may be used to enter the new setpoint.
NOTE: All digits must be entered, including zeros. For
example, (01.0).
NOTE: The DAY, AUX 1, and AUX 2 setpoints, once selected,
are changed or updated by pressing the [CHANGE] key.
NOTE: Certain setpoints may be reported in either pounds
per square inch gauge (g) or inches of mercury (hg). To
toggle between (g) and (hg), having selected the setpoint,
press the [+/-] key to toggle between (g) and (hg).
4. In the event that an incorrect setpoint is keyed in all or
part, press the [CLEAR] key to restore the original setpoint.
Pressing the [CLEAR] key a second time will eliminate the
flashing brackets.
5. Having keyed the desired setpoint, press the [ENTER]
key. The new setpoint will be entered and the flashing brack-
ets will move or step to the next setpoint.
NOTE: A setpoint entry outside the parameters of the
Adjustable Setpoint display will be refused and the origi-
nal Adjustable setpoint will be restored.
NOTE: To clear any time values [STEP] to the desired
setpoint, press [CHANGE] and then press [CLEAR].
ID - The ID number is a programmable identification code
used in telecommunications to access a specific compres-
sor.
DATE - The Date displays the current date in the following
format: Month - Day - Year.
DAY - Day will display the current day of the week.
TIME - The Time displays the current time in the following
format: Hours - Minutes - Seconds. The time is in 24:00:00
hour clock format.
BAUD - Shows the baud rate of the RS422 communication
ports 1 and 2. Both ports are configured as follows: word = 8
bit, parity = none or even, stop = 1 bit. The communications
ports are programmable from 300 to 19200 baud.
AUX 1 and AUX 2 - May be configured for either an alarm or
shutdown and with either a normally closed (NC) or nor-
mally open (NO) contact.
CT FACTOR - The Current Transformer Factor records the
proper current transformer factor to match the compressor
motor FLA rating to the current transformer primary rating.
The CTF factor is programmable and its correct value is
determined by the following formula:
CTF =
1024 x FLA (Full Load Amps)
10 x CT (Current Transformer Primary Amps)
EXAMPLE: FLA = 230 Amps
CT = 300 (300:5)
CTF =
1024x 230 = 78 (Round to whole number)
10 x 300
RECY. DELAY - The Recycle Delay displays the current
recycle delay setpoint in minutes. NOTE: Consult motor
manufacturer for recommended setpoint.
ADJUSTABLE SETPOINTS PAGE 2 *
ADJUSTABLE SETPOINTS Page 2:
Start Diff Press--[100g]
Dead Band--[1.0#]
Prop. Band-[10 %]
Cycle Time-[10 sec]
Low % FLA--[020 %]
Dead Band - This is a + (plus) or - (minus) value above or
below the setpoint at which the compressor will neither load
nor unload. A dead band of 1 is the default value. It is
adjustable between .5 lbs. to 5 lbs. in increments of .5. The
“Step” key is used to select this setpoint; then press the
“Change” key to toggle through the selections.
Proportional Band - This setpoint is used to determine the
amount of time the load/unload solenoid is energized, ac-
cording to how far from the setpoint the actual control pres-
sure is. The smaller the number, the longer a load/unload
signal will be sent. 10% is the default value. Selections are
2, 5, 10, 15, 20, or 25%. The “Step” key is used to select this
setpoint; then press the “Change” key to toggle through the
selections.
*Display for illustrative purposes only.
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