Applications Guide Tracer Graphical Programming - Trane

®
Summary-question answers
Figure 189: Equip Room Exhaust Fan program with a modification
7. Delete the ON constant block. Connect the output of the Fail block to
both the Relay Control and Normally Open ports of the Switch block
(Figure 189).
Figure 190: Feedback Alarm block substitution
Chapter 4, “Cooling tower with
two-speed fan example”
1. The Latch block may be configured in timed or manual mode. In manual
mode, it does not provide for a time-interval input.
2. Omit the Delay on Start block and its associated Constant block.
Chapter 5, “Cooling tower with
variable-speed fan example”
1. The Feedback Alarm block is a combination of the XOR, Delay on
Start, and Latch blocks. The sequence of operation might read as follows:
Compare Request to Status. If Request does not equal Status for
a period of 30 seconds, initiate an alarm. The alarm must be resettable.
See Figure 190 for the possible substitution.
2. See Figure 191 on page 237 for an example of how you could automatically
reset the alarm reset without using a Switch block. Each time
the program runs, the Alarm Reset is set to off.
236 CNT-APG001-EN