RT-SVP011E-EN 39
TD7 Display
Data Graphs
Data graphs allow users to view trend logs from the controller in graphical format on the TD7
Display. Up to eight standard data graphs can be viewed. Custom graphs are user defined and can
be edited by changing the scale on the left and right Y-axis and choosing the line color.
Touch the Da
ta Graphs button in the bottom display area to view
the Data Graphs screen
(Figure 28). The Data Graphs screen contains eight buttons that allow you to view one of eight
standard graphs. Some standard graphs may not exist for your unit.
High Discharge Sat Temp Capacity
Limit
This circuit-level feature applies when the discharge saturated temperature
approaches
the compressor operating map limit for high discharge saturated
temperature. Limit control action modifies the normal capacity modulation to
decrease capacity by reducing compressor speed. The objective is to maximum
the capacity within the compressor operating map design limit.
High Discharge Sat Temp Speed
Li
mit
This
circuit-level feature applies when the discharge saturated temperature
approaches
the compressor operating map limits. Limit control action modifies
the allowable compressor speed range. The objective is to maximize the
allowable speed range.
High Suction Saturated Temp Inhibit
1A
Protection for when the suction saturated temperature
nears the operating map
design limit. Mode displayed if the limit control integral trips and the inhibit
command becomes active.
High Suction Saturated Temp Limit
1A
Protection for when the suction saturated temperature
nears the operating map
design limit. Mode displayed if the suction saturated temperature is in the unload
region and the variable speed compressor is running.
Low Compressor Suction Pressure
Limit
This func
tion shall prevent the addition of circuit capacity any time the circuit is
running and Com
pressor Suction Refrigerant Pressure CktX is less than (1.4 *
Low Compressor Suction Pressure Cutout Normal CktX).
Low Suction Saturated Temp Speed
Limit
This
circuit-level feature applies when the suction saturated temperature
approaches
the compressor operating map limits. Limit control action modifies
the allowable compressor speed range so the unit operates within the map limits.
Table 15. Circuit operation-top level mode - shutting down
Circuit Description
Top Level Mode
Shutting Down The circuit is preparing to de-energize the compressor.
Preparing Shutdown Sub
Modes
Diagnostic Shutdown – Manual Reset The circuit has been shutdown on a latching diagnostic.
Front Panel Circuit Lockout
The circuit is manually locked out by the circuit lockout setting – the nonvolatile
lockout setti
ng is accessible through either the TD7 Display or TU.
Starting is Inhibited by Low Ambient
Tem pe ra
tu re
The Outdoor Air Temperature Active has fallen below the Low Ambient Lockout
Setpoint.
Table 14. Circuit operation-top level mode - running-limit (continued)
Circuit Description
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