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7.15 Limit-exceeded function
The "Limit-exceeded 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 up 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 which is to be monitored
by the "Limit-exceeded function".
Limit
Here you set the limit which activates the "Limit-exceeded
function".
Hysteresis band
Here you set the hysteresis band.
Limit exceeded when
Here you can set if you want the "Limit-exceeded function" to
activate 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
7.9 Signal relays 1 and 2 (Relay outputs)
.
• Warning/alarm
A warning is raised.
• 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
"Limit-exceeded 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 "Limit-exceeded function" is to monitor the discharge
pressure from a CRE pump. If the pressure is below 5 bar for
more than 5 seconds, a warning must be given. If the discharge
pressure is above 7 bar for more than 8 seconds, the limit
exceeded warning must be reset.
Fig. 37 Limit exceeded (example)
Factory setting
See section
16. Factory settings
.
7.16 LiqTec (LiqTec function)
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 will stop the pump
if dry running occurs. Restart the pump manually if it has been
stopped due to dry running.
Factory setting
See section
16. Factory settings
.
Pump variant Limit-exceeded function
CME ●
CRE, CRIE, CRNE, SPKE, MTRE ●
TM
06 46
03 251
5
Pos. Setting parameter Setting
1 "Measured" Discharge 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
LiqTec
(LiqTec function)
CME -
CRE, CRIE, CRNE, SPKE, MTRE ●
1
2
4 4
5 6
3
A
Time (s)