Mydax, Inc. 1M9W-S Water Cooled Chiller
Lawrence Berkeley Laboratory
10
last history reset, the display reads "No Alarms". If alarms have occurred, the display shows them in sequence,
like the main display. The history can be cleared 3 ways:
1. Power Off/On
2. Press START Key when unit is stopped
3. Press 0 Key when viewing Test Panel 8
The second line of the display can be read when the chiller is stopped. It indicates the reason that the chiller
was last stopped: KEY, FATAL, RS232 or EXT. The right side of the second line indicates the elapsed run
time on the system in days (from 0 to 9999), hours, minutes and seconds. This system is equipped with a
battery which, if operational, saves the elapsed run time value when the system is stopped and restarted. The
elapsed run time is reset each time the system is restarted.
TEST PANEL #9:
This display provides run/event recorder data. The run/event recorder continuously records important
information into a non-volatile memory while the system is operating. Data is stored at one-second intervals
for the last 120 seconds of run time and it is also stored at two-minute intervals for the last 240 minutes of run
time.
The first line of this display indicates the run time in hours, minutes and seconds prior to the last system
shutdown, the output and setpoint temperatures of whichever recirculating channel was last selected at the Main
Display and the system-wide alarm history. The second line indicates which recirculating channel was last
selected at the Main Display, the evaporator, bypass, condenser and superheat RTD temperatures in °C, the
average superheat temperature from Test Panel 3 and the flow rate. Both the evaporator temperature and the
flow rate are specific to the recirculating channel being viewed. All freon circuit RTD temperatures are
truncated to the nearest 1°C for this display.
After the system is stopped and Test Panel 9 is selected, the memory is displayed at the last or most recent
second (T- 0: 0: 0). The downward arrow key can be used to decrement time into the past. There are 120 "1-
second slots" and 120 "2-minute slots". If the downward arrow key is held down, the time slots decrement at
the rate of two slots per second. The upward arrow key increments to more recent time slots. If the "Z" key
is depressed, the display goes to the oldest 1-second slot (T- 0: 1:59 if the actual run time was of at least that
duration). If the "9" key is depressed while viewing Test Panel 9, the display reverts back to "T- 0: 0: 0", the
stop time.
The alarm messages are accurate for the slot that is current. If the display is on the minutes slot, then the alarms
indicated are any which have occurred during that 2-minute interval. Alarm messages cycle or flash in an
identical fashion to those appearing in either the Main Display or in Test Panel
T- 0: 0: 0 20.02 20.0 No Alarms.....
Tank 1 4Ev 0By 37Cd 13Sh 14SA Gpm
Содержание 1M9W-S
Страница 20: ...This page is intentionally left blank...
