Limit-Exceeded Function; Pulse Flowmeter Setup - Grundfos TPE2 D Manual Del Usuario

17.23 Limit-exceeded function

Pump variant
TPE3,TPE3 D
TPE2,TPE2 D
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 if you want 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 17.16 "Signal relay 1 and 2" (Relay
• "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 run at a speed set by the user.
• Alarm + Stop
An alarm is given and the pump stops.
• Alarm + Min.
An alarm is given and the pump decreases speed to minimum.
• Alarm + Max.
An alarm is given and the pump increases speed to maximum.
• Alarm + User-defined speed
An alarm is given and the pump 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.
48

Limit-exceeded function

●
●
outputs).
Example
The function is to monitor the outlet pressure of a pump. If the
pressure is below 72.5 psi (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.
1
2
4 4
A
5
Fig. 67 "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 35. Factory settings.

17.24 "Pulse flowmeter setup"

Pump variant
TPE3,TPE3 D
TPE2,TPE2 D
You can connect an external pulse flowmeter to one of the digital
inputs in order to register the actual and accumulated flows.
Based on this, you can also calculate the specific energy.
To enable a pulse flowmeter, set one of the digital-inputs to
Accumulated flow and set the pumped volume per pulse.
See section 17.13 Digital inputs.
Factory setting
See section 35. Factory settings.
3
Time [s]
6
Setting
Outlet pressure
72.5 psi (5 bar)
29 psi (2 bar)
Below limit
5 seconds
8 seconds
-
Warning

"Pulse flowmeter setup"

●
●