Applications Guide Tracer Graphical Programming - Trane

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Summary questions
Summary questions
Answer the following questions to review the skills, concepts, and definitions
you learned in this chapter. The answers to these questions are on
page 243.
1. The SCC profile contains a variable called nviEmergOverride. This
variable contains an enumerated value. It may be used to communicate
an emergency shutdown to the Tracer MP580/581 controller.
How would you use this variable in the fan control program to control
the supply fan?
2. The SCC profile contains a variable called nviValveOverride of type
SNVT_hvac_overrid. This variable contains a structure made up of
three elements. The first of which is the override mode. The Tracer
Summit system is capable of communicating the following values as
the override mode to the Tracer MP580/581 controller:
• 0 (Override Off)
• 4 (Override Open)
• 5 (Override Close)
Incorporate logic in the discharge air control program to accommodate
the valve override for both the cooling and heating valves.
3. You constructed a number of programs that incorporated alarm management
and reset. In many cases, the alarm reset variable was automatically
set to off after the operator turned it on to reset an alarm.
How would you accomplish the same functionality from the building
automation system (Tracer Summit)? Hint: A CPL program is
required.
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