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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Line no. Operating line
Controller 1 Controller 2
5575 5585 On time min dT contr 1, 2
Two delta-T controllers are available, each of which can be configured and used
independently of the other.
The graphs and explanations below illustrate the operating lines of delta-T controller 1
(5570...5575). All the same principles apply to delta-T controller 2 as well (5580...5585).
Temperature overshoot
This function can be used to compare a freely selectable temperature value with an
adjustable limit value.
Sensor 2 dT controller 1 (5574) must be deactivated (setting: None).
In this case, the relay switches when the limit value is overshot.
7471d75/0114
Figure 83: Temperature overshoot
Key
5571 Temp diff off dT contr 1
5572 On temp min dT contr 1
5573 Sensor 1 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 1 dT controller 1 (5573) overshoots On temp min dT contr 1 (5572).
Relay dropout
Relay K21 drops out if the following condition is met:
Sensor 1 dT controller 1 (5573) undershoots 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.
On time min dT contr 1,
2
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