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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Temperature undershoot
This function can be used to compare a freely selectable temperature value with an
adjustable limit value.
Sensor 1 dT controller 1 (5573) must be deactivated (setting: None).
In this case, the relay switches when the limit value is undershot.
7471d76.des
Figure 84: Temperature undershoot
Key
5571 Temp diff off dT contr 1
5572 On temp min dT contr 1
5574 Sensor 2 dT controller 1
5575 On time min dT contr 1
K21 Relay
t Time
T Temperature
Relay pickup
Relay K21 picks up if the following condition is met:
Sensor 2 dT controller 1 (5574) undershoots On temp min dT contr 1 (5572).
Relay dropout
Relay K21 drops out if the following condition is met:
Sensor 2 dT controller 1 (5574) overshoots On temp min dT contr 1 (5572) by more
than Temp diff off dT contr 1 (5571).
If On time min dT contr 1 (5575) has been set, the relay waits at least until this time has
elapsed before dropping out.
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