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On time min dT contr 1,
2
374/617
Building Technologies Division
Line no.
Controller 1
Controller 2
5575
5585
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.
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.
User Manual LMS14...
6 The settings in detail
Operating line
On time min dT contr 1
, 2
CC1U7471en
28.01.2015
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