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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Differential temperature controller
This function can be used to compare two freely selectable temperature values with
one another. At the same time, an absolute minimum is monitored.
7471d77/0114
Figure 85: Differential temperature controller
Key
5570 Temp diff on dT contr 1
5571 Temp diff off dT contr 1
5572 On temp min dT contr 1
5573 Sensor 1 dT controller 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 both of the following conditions are met:
Sensor 1 dT controller 1 (5573) overshoots Sensor 2 dT controller 1 (5574) by more
than Temp diff on dT contr 1 (5570), and Sensor 1 dT controller 1 (5573) exceeds On
temp min dT contr 1 (5572) by more than Temp diff on dT contr 1 (5570) minus Temp
diff off dT contr 1 (5571).
Note!
For an illustration of this, see the final pickup point on the graph.
Relay dropout
Relay K21 drops out if at least one of the following two conditions is met:
Sensor 1 dT controller 1 (5573) is further away from Sensor 2 dT controller 1 (5574)
than Temp diff off dT contr 1 (5571) when approximated from above, or Sensor 1 dT
controller 1 (5573) drops below On temp min dT contr 1 (5572).
Note!
For an illustration of this, see the final dropout point on the graph.
If On time min dT contr 1 (5575) has been set, the relay waits at least until this time has
elapsed before dropping out.
Line no. Operating line
Controller 1 Controller 2
5577 5587 Pump/valve kick K21, K22
Off
On
Pump/valve kick K21,
K22
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