Monitor Program Data and Controls
58 Danfoss Turbocor Compressors Inc.
ECD-00007M Rev. 1
The graph, as shown in Figure 43, displays the saturated
discharge temperature (SDT) versus the evaporator
capacity. For a given evaporator capacity, the red lines
mapped on the graph represents the constant compressor
speed (in RPM) required to bring the saturated discharge
temperature to the desired level. The mapping outline
represents the compressor operational envelope, limited to
the left by the minimum operational capacity, and to the
right by the maximum operational capacity. The compressor
cannot operate for load capacities outside the operational
envelope. The blue dot on the compressor map represents
the current operating point.
The outputs section shows the estimated capacity and
performance of the compressor, given the set of inputs. The
inputs are generated automatically when the serial port
connection has been established (refer to 3.5 "Serial Port
Connection" on page 6).
However, if the compressor is offline (i.e. the serial port
connection has not been established), then it is possible to
calculate the estimated compressor capacity and
performance. To do so, input the following parameters in
the input section:
• Suction pressure [kPa/Psi]
• Suction temperature [ºC/ºF]
• Discharge pressure [kPa/Psi]
• Mains (3-phase AC) power input [kW]
• Shaft speed [RPM]
• Subcooling temperature [ºK/ºR]
If the metric values (kPa, ºC, ºK) were inputted, set the
“Check for Metric” checkbox. If imperial values (Psi, ºF,
ºR) were inputted, ensure the checkbox is clear.
Click on the “Calculate” button. The graph and “outputs”
section shows the estimated compressor capacity and
performance.
NOTE:
The measurement unit (metric/imperial) displayed depends
on the measurement unit previously set. To verify or change
the measurement unit, refer to section 6.3 "Compressor
Control" on page 23.
Figure 43 Compressor Map
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