Liqtec" ("Liqtec Function"); Stop Function" ("Low-Flow Stop Function") - Grundfos CRE Notice D'installation Et De Fonctionnement

Detection delay
You can set a detection delay which ensures that the monitored
parameter stays above or below a set limit in a set time before the
function is activated.
Resetting delay
The resetting delay is the time from which the measured
parameter differs from the set limit including the set hysteresis
band and until the function is reset.
Example:
The function is to monitor the outlet pressure from a CRE pump.
If the pressure is below 5 bar for more than 5 seconds, a warning
must be given. If the outlet pressure is above 7 bar for more than
8 seconds, reset the limit exceeded warning.
1
2
4 4
A
5
Fig. 69 Limit exceeded (example)
Pos. Setting parameter
1 "Measured"
2 "Limit"
3 "Hysteresis band"
4 "Limit exceeded when"
5 "Detection delay"
6 "Resetting delay"
A "Limit exceeded function active" -
- "Action"
Factory setting
See section 10. Technical data.
3
Time [s]
6
Setting
Outlet pressure
5 bar
2 bar
Below limit
5 seconds
8 seconds
Warning

7.16 "LiqTec" ("LiqTec function")

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
You can enable the function of the LiqTec sensors in this display.
A LiqTec sensor protects the pump against dry running.
The function requires that a LiqTec sensor has been fitted and
connected to the pump.
When you have enabled the LiqTec function, it stops the pump if
dry running occurs. Restart the pump manually if it has been
stopped due to dry running.
"Dry running detection delay"
You can set a detection delay in order to make sure that the pump
is given a chance to start up before the LiqTec function stops the
pump due to dry running.
Range: 0-254 seconds.
Factory setting
See section 10. Technical data.

7.17 "Stop function" ("Low-flow stop function")

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
You can set the "Low-flow stop function" to these values:
"Not active"
•
• "Energy-optimal mode"
• "High-comfort mode"
• "User-defined mode" ("Customised operating mode").
When the low-flow stop function is active, the flow is monitored. If
the flow becomes lower than the set minimum flow (Q
pump changes from continuous operation at constant pressure to
start-stop operation and stops if the flow reaches zero.
"LiqTec"
("LiqTec function")
●
●
"Stop function"
("Low-flow stop
function")
●
●
), the
min
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