7.18 Limit-exceeded function
Pump variant Limit-exceeded function
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with
Delta ρ sensor
●
Use this function to 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 up to
four limit-exceeded functions, meaning that you can monitor four
different parameters or two to four limits of the same parameter
simultaneously.
Note that, if using Limit 1-3 exceeded in a multipump system, the
selected action will have an impact on the system, e.g. if Action is
set to Stop, then the system will stop.
Limit 4 exceeded in a multipump system will be a local function.
The selected action will only have an impact on the single pump,
e.g. if Action is set to Stop, then only the single pump will stop.
For Limit 4 exceeded in a multipump system, the action
will always lead to a pump stop, alarm and stop or a
warning.
The function requires setting of the following parameters:
Measured
Set the measured parameter to be monitored.
Limit
Set the limit which activates the function.
Hysteresis band
Set the hysteresis band for when the function must be deactivated
again.
Limit exceeded when
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 set an action. The following
actions are available:
• Not active
The pump remains in its current state. Use this setting if you
only want to activate a signal relay output when the limit is
reached.
• Stop
The pump stops.
• Min.
The pump reduces the speed to minimum speed.
• Max.
The pump increases the speed to maximum speed.
• User-defined speed
The pump runs at a speed set by the user.
• Alarm and Stop
An alarm is given, and the pump stops.
• Alarm and Min
An alarm is given, and the pump decreases the speed to a
minimum.
• Alarm and Max
An alarm is given, and the pump increases the speed to
maximum.
• Alarm and User-defined speed
An alarm is given, and the pump runs at the speed set by the
user.
Alarm and Warning text
The Limit-exceeded function will automatically define a relevant
alarm/warning text based on the Measured parameter and Limit
exceeded when functions.
The auto defined text can be overwritten by selecting the alarm/
warning text option Limit X exceeded.
The following list shows the auto defined texts:
• Limit X exceeded
• Low inlet pressure
• High discharge pressure
• High pressure
• Low pressure
• High temperature
• Low temperature
• High flow
• Low flow
• High level
• Low level
• High diff. pressure
• Low diff. pressure
• High conductivity
Detection in Stop
Enable this function to prevent the pump from monitoring the limit
while the pump is in the Stop state.
Use the Detection delay function to allow the pump to
start up and bring the value above the limit before
detecting.
Detection delay
Setting the detection delay 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 when the measured parameter
differs from the set limit, including the set hysteresis band, and until
the function is reset.
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