Detection Of Slowly Evolving Problems; Figure 5.1: Ltc Differential Set Point Operation - Advanced Power technologies TTC-1000 Instruction & Operation Manual

5.1 Detection of Slowly Evolving Problems

Figure 5.1 illustrates how the LTC differential set point operates for detection of
slowly evolving problems.
Temperature
Top Oil Temperature
LTC Tank Temperature
LTC DIFF Pickup
LTC DIFF Drop Out
LTC Tank Temp - Top Oil Temp
LTC Pickup Timer
LTC Set Point

Figure 5.1: LTC Differential Set Point Operation

The TTC-1000 uses an LTC pickup timer settable from zero to 999 minutes to
supervise the LTC set point. The above example shows that the differential set
points do not pickup until after the timer is complete. If the differential
temperature drops down below the pick up temperature while the timer is in
progress, the timer will reset. This timer allows the differential temperature set
points to "ride" through daylight heating and hence permits a more sensitive
setting. The above example shows that the LTC set point does not drop out
because the difference between the LTC Tank temperature and the Top Oil
temperature does not drop down to the LTCDIFF1 or 2 drop out temperature set
point.
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