CSZ EZT-570S, Руководство пользователя

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EZT-570S User Manual
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Time Period - Adjusts the displayed time period for the graph. The allowable range is
from 4 to 1440 minutes (24 hours).
Maximum - The maximum value sets the maximum range of the vertical access with a
minimum value of -32,760 and a maximum of 32,760.
Minimum - The minimum value sets the minimum range of the vertical access with a
minimum value of -32,760 and a maximum of 32,760.
Automatic Scale - When on, the vertical axis will automatically adjust its zero and span as
needed to display the selected plot channels.
2.4 Alarm Monitor
The alarm screen displays any current and/or previously silenced alarms according to time and date
of occurrence. On each new alarm occurrence, the alarm icon in the menu bar will flash to notify the
user of a new alarm. Once the alarm is reset, the alarm icon will be hidden; however, the alarm
condition may still be present. The chamber will not restart until all alarms have been reset and the
alarm condition has cleared.
If the chamber does not restart upon reset of the alarm, verify that all manual reset safeties have
been reset and the alarm condition has been cleared by pressing the “Clear” button. This will remove
all alarms that have been reset from the list. If the alarm is still present, the alarm condition still exists
and must be corrected in order for the chamber to resume operation.
Figure 2-7 Alarm Monitor
2.4.1 Pumpdown
Chambers with large horsepower refrigeration systems have an automatic mode of operation called
“pumpdown”. The refrigeration system is in this mode whenever it is not running to cool or
dehumidify the chamber. In pumpdown mode, the system 1 compressor will automatically turn on
and off at preset pressures in order to force refrigerant into the high side of the system. This serves
as a means to protect the compressor on start-up.
If pumpdown was not used, refrigerant could migrate throughout the system and accumulate, typically
in the coldest location like the compressor crankcase. On start-up, this refrigerant could then enter
the compressor as a liquid and cause permanent damage to the compressor. In addition, a