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5.0 START-UP AND CONTROL PANEL
5.3.6 COMPRESSOR PROTECTION
The operating limits (hereafter defined as envelope) of the compressors are
controlled. This control cannot be disabled in order to prevent the compressor
from working outside of the safety limits dictated by the manufacturer. All of
the compressors inserted thus contain the envelope data.
Besides the operating limits specified by the manufacturer, there is the
possibility of customizing the maximum condensation (
Ca18
) and minimum
evaporation (
Ca17
) thresholds. These thresholds are considered only if they are
more restrictive than the operating limits.
The description of the work zones of a generic envelope are shown below:
Zone
Par.
Description
1
Zone inside the operating limits (prevention is anyway active to avoid going outside limits)
2
Max compression ratio
3
Max condensation pressure
3 Custom
Ca18
Max condensing pressure custom threshold
5
Max evaporating pressure
6
Min compression ratio
7
Min differential pressure
8
Min condensation pressure
9
Min evaporating pressure
9 Custom
Ca17
Min evaporating pressure custom threshold
When the operating condition is outside of the envelope, the alarm delay starts counting: if the operating condition remains outside of the
envelope when the delay has elapsed, a specific alarm is activated, which stops the compressor; if, on the other hand, the operating condition
returns within the envelope limits, the alarm delay counter is reset.
The condensation high pressure limit is determined from the minimum between:
-
the nominal compressor threshold
-
the threshold that can be set by Service (
Ca18
)
The evaporation high pressure limit is determined from the minimum between:
-
the nominal compressor threshold
-
the set MOP threshold (
B020
- CH o
B022
- HP)
The evaporation low-pressure limit for prevention is determined from the maximum of:
-
the nominal compressor threshold
-
the threshold that can be set by Service (
Ca17
)
-
the antifreeze limit depends on the mode (
A039
)
It is necessary to have an in-depth knowledge of operation and the methods of use of the microprocessor system. Abnormal operations, which
do not comply with the description and with the subsequent adjustment phases could seriously damage the equipment and all of the machine.
It is essential to have read and understood the information contained so far before operating on the system, or contact highly specialised
technicians. In the event of queries,
contact the Manufacturer’s
Technical Assistance Office.
Condensing
temperature
Evaporating
temperature
