Dunham-Bush ACDX, Инструкции по установке, эксплуатации и обслуживанию, Страница: 19 / 44

3. Press ENTER. The current status will change 3.7 To Set Date and Time
to PROG (program) if accepted. If no keys are
pressed for five minutes, or if the Authorization
screen is re-displayed, the authorization to
change setpoints is removed and the above
procedure must be repeated to log in.
3.5 To Alter Setpoint Data
1. You must be authorized and in the PROG
mode. See section 3.4.
2. Select SETPOINTS A & B on the main
menu. Press ENTER.
3. Use the up or down arrow keys to select
the setpoint to be changed. Press
ENTER. A cursor will flash over the
setpoint A value.
4. a) If you want to change setpoint A, press
in the desired new value and press
ENTER. If the new value is within limits, it
will be stored in memory. The cursor will
then move to setpoint B.
b) If you do not want to change setpoint
A, press ENTER.
5. Repeat Step 4 for Setpoint B.
3.6 To Calibrate Temperature and Pressure Sensors
NOTE: Pressure calibration should only be
done by a qualified refrigeration
technician. Calibrate amps with
potentiometer on filter board.
NOTE: For units with SI display option, the
critical temperature and pressure
calibration values are stored in the
setpoints corresonding to the sensor
names or numbers.
1. You must be authorized and in the PROG
mode. See Section 3.4.
2. Display the analog sensor to be calibrated
on the top line of the display.
3. Press ENTER to show ZERO CALI-
BRATION value.
4. Use an accurate gauge to measure the
analog value when it is stable and near de-
sign conditions.
5. Determine the revised zero calibration
required as follows: Meter Reading - AI
D Zero Calibration = New Zero
Calibration. The new zero calibration must
be rounded to the nearest whole number.
6. Press ENTER to place the cursor on the
zero calibration value.
7. Enter the new value from Step 5. Negative
values are entered by pressing LOWER
FU/- before the number.
8. Press ENTER to store the revised zero
calibration.
For example, if a suction pressure gauge
shows 58 psig and the computer displays
60.3 psig with a zero calibration of -1, then
new calibration would be 58 - 60.3 + (-1) =
-3.3 (-3). So the zero calibration should be
changed to -3.
1. You must be authorized. See Section 3.4.
2. Select DATE & TIME SET on the main
menu. Press ENTER to display current
date and time.
3. Press ENTER key to move cursor to each
date/time item.
4. As each item flashes, use the number keys
to enter revised data if necessary. The day
of week, SUNday through SATurday, is
selected by number keys 1 through 7,
respectively.
5. Press ENTER to continue. The last
ENTER will store the new date and time.
WARNING: Setting the clock will cause a
system reset. The entire unit will shut
down and start over again. If the change
was started inadvertently, press MENU key
before completing the change.
3.8 To Display Data without Accessing Menu
1. Press LOWER FUNCTION.
2. Press function desired (blue sub-script)
3. Press item number to be displayed.
4. Press ENTER.
EX: To display analog input #5, press
LOWER FUNCTION, ANALOG INPUT, 5,
ENTER.
3.9. To Revise Unit Schedule of Operation (Optional)
If a seven day time schedule of unit operation is
desired, the internal real time clock of the
microcomputer can be used. When the
SCHEDULE control point is ON, the unit is
allowed to operate. The following procedure is
used to modify the operating schedule.
1. Perform the authorization procedure (See
3.4).
2. Press MENU key.
3. Use Up and Down to select CONTROL
POINTS.
4. Press ENTER.
5. Use Up and Down to select SCHEDULE
control point.
6. Use
6
to display the first schedule. The
standard display screen would show:
CP 17 SCHEDULE GRP:1 SCH:1 0000
2400 DAYS: *** ALL DAYS ***
This indicates that control point 17 named
SCHEDULE is controlled by schedule group
(GRP) #1. The first schedule (SCH:1) turns
on at 0000 hours and off at 2400 hours
(military time) every day of the week. Thus
it is on all the time.
7. To change this schedule, press ENTER.
The cursor will flash over the turn-on time.
To move to the next schedule, press the
right arrow key.
8. Use the number keys (0-9) to enter the
revised turn-on time using military format.
9. Press ENTER. The cursor will move over to
the turn-off time.
10. Use the number keys to enter the turn-off
time in military format.
11. Press ENTER. The cursor will move to
DAYS during which this schedule is active.
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