Dunham-Bush ACDX, Инструкции по установке, эксплуатации и обслуживанию

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2.3. Strip wires away from microcomputer to 2.6. Disconnect power to the NC25 when changing
prevent strands from falling on a chip on the board. Check to make sure that
components. pin 1 of chip is in upper-left corner and that the
2.4. Do not allow the component boards to get power.
wet.
2.7. Route ribbon cable and sensor wires away
2.5. Disconnect power to the NC25 when from control and power wires.
plugging in or unplugging a ribbon cable
connector.
2.8. Handle boards with care.
chip is inserted fully before reconnecting
3. Operation of LCD Display NC25-4 C. -- CURRENT -- --- TARGET ---
The following instructions are for operation of the VALUE VALUE VALUE VALUE
NC25-4 microcomputer with 2 x 40 character LCD
display.
The values under CURRENT and TARGET
3.1 To Display data from the menu and setpoints for different types of control
1. Press the MENU key. give current and target leaving water
2. Use the up or down arrow keys to select temperature and percent full load capacity.
the type of information desired. The main Fan type control points give the current
menu items are: analog value and target turn on and turn off
DATE & TIME SET DIGITAL SENSORS
ALARMS CONTROL POINTS
SETPOINTS A & B AUTHORIZATION
ANALOG SENSORS
3. Press the ENTER key.
4. Use the up or down arrow keys to select
the desired data. For control points,
additional data can be viewed with the
right and left arrow keys. Press the right
arrow key to sequence through the
following screens:
A. LAST ON/OFF - RUN T/Y - CYC
TIME TIME TIME TIME COUNT
LAST ON/OFF gives the time of day
that the control last turned on or off.
The last on time is not updated if a
screw compressor is started manually.
RUN T/Y gives the accumulated time
that the control point has been on
today (T) since midnight and the
accumulated run time during
yesterdays(Y) twenty-four hour period.
CYC gives the number of times that
the control point cycled off since
midnight. If a feedback digital input is
associated with a control point (EX:
compressor) the digital input cycles are
recorded.
B. TOTAL RUN TIME = COUNT
TOTAL CYCLES = COUNT
TOTAL RUN TIME gives the number of
hours the control point has been on
since memory clear was performed.
This records up to 65,000 hours.
TOTAL CYCLES gives the number of
cycles since a memory clear was
performed. This records up to 65,000
cycles.
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give different operating analog input values
points. Screw compressor control points
setpoints.
NOTE: When displaying analog sensors, the
PAGE MODE key can be pressed to display two
new analog inputs after each arrow key is
pressed. Press PAGE MODE again to return to
displaying one new analog input.
3.2 To Reset All Control Points to Computer control
1. Press the RESET key.The display will show
RESET ALL CPs to COM MODE? N Y
2. Press the right arrow key to select Y.
3. Press the ENTER key. The reset will not be
accepted if a lockout control point is active.
Resolve the problem and reset again.
3.3 To Display Alarms
1. Press the MENU key.
2. Use the up or down arrow to select
ALARMS.
3. Press ENTER.
4. The day, time, and alarm code is displayed.
Alarm 1 is the most recent alarm.
5. Press the down arrow to view previous
alarms.
6. Check the data label to obtain the name of
the alarm. If the data label is not available,
display the digital input that corresponds to
the alarm number. If the digital input name
is SPARE, then display the control point that
corresponds to the alarm number. EX: If
alarm code 29 has occurred then display
digital input 29 or control point 29 to
determine the failure.
3.4 To Become Authorized
1. Select AUTHORIZATION on the main menu.
Press ENTER.
2. The current status will show VIEW, press the
authorization code (64) on the number keys.