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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.
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.
User Manual LMS14...
6 The settings in detail
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CC1U7471en
28.01.2015
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