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14.20 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 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 14.13 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.
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. 70 Limit exceeded (example)
Factory setting
See section 31. Factory settings.
14.21 Pulse flowmeter setup
An external pulse flowmeter can be connected to one of the
digital inputs in order to register the actual and accumulated
flows. Based on this, the specific energy [kWh/m
3
] can also be
calculated.
To enable a pulse flowmeter, one of the digital inputs must be set
to "Accumulated flow" and the pumped volume per pulse must be
set. See section 14.11 Digital inputs.
Factory setting
See section 31. Factory settings.
Pump variant Limit-exceeded function
TPE3, TPE3 D -
TPE2, TPE2 D
TM06 4603 2515
Pos. Setting parameter Setting
1 Measured 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
Pump variant Pulse flowmeter setup
TPE3, TPE3 D -
TPE2, TPE2 D
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