Grundfos TPE Series - Limit-Exceeded Function

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13.17 Limit-exceeded function
This function can monitor a measured parameter or
one of the internal values such as speed, motor load
or motor current. If a set limit is reached, a selected
action can take place. You can set two
limit-exceeded functions meaning that you can
monitor two parameters or two limits of the same
parameter simultaneously.
The function requires setting of the following:
Measured
Here you set the measured parameter to be
monitored.
"Limit"
Here you set the limit which activates the function.
"Hysteresis band"
Here you set the hysteresis band.
"Limit exceeded when"
Here you can set the function to be activated when
the selected parameter exceeds or drops below the
set limit.
• "Above limit"
The function is activated if the measured
parameter exceeds the set limit.
• "Below limit"
The function is activated if the measured
parameter drops below the set limit.
Action
If the value exceeds a limit, you can define an action.
You can select the following actions:
• "No action"
The pump remains in its current state. Use this
setting if you only want to have a relay output
when the limit is reached. See section
13.12 "Signal relays 1 and 2" (Relay outputs).
• "Warning/alarm"
There is a warning.
•Stop
The pump stops.
•Min.
The pump reduces speed to minimum.
•Max.
The pump increases speed to maximum.
• "User-defined speed"
The pumps runs at a speed set by the user.
"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 of a
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,
you must reset the warning.
Fig. 51 "Limit exceeded" (example)
Factory setting
See section 30. Factory settings.
Pump variant
Limit-exceeded
function
TPE, TPED, NBE,
NBGE, NKE, NKGE
●
TPE, TPED, NBE, NKE
Series 2000
●
TM06 4603 2515
Pos. Setting parameter Setting
1Measured
"Outlet
pressure"
2 "Limit" 5 bar
3 "Hysteresis band" 2 bar
4 "Limit exceeded when" "Below limit"
5 "Detection delay" 5 seconds
6 "Resetting delay" 8 seconds
A
Limit-exceeded function
active
-
- "Action" "Warning"
1
2
4 4
5 6
3
A
Time [s]