Grundfos RADIOMODULE 2G4 - Stop at Min. Speed

• 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 Userdefined speed
An alarm is given and the pump runs at the speed set by the user.
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.
Example
The function is to monitor the outlet pressure from a CRE pump. If the pressure is below 5 bar for more than 5 seconds, a warning is indicated.
If the pressure is above 7 bar for more than 8 seconds, reset the limit-exceeded warning.
1
2
4 4
5 6
3
A
Y
X
TM070085
X: Time in seconds
Y: Pressure in bar
Pos.
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
6.17 "Stop at min. speed"
This stop function can be utilised in for example constant level applications where a boost of pressure is not needed. It is a different type of
stop function than low flow stop but the purpose is the same. The pump stops if there is no or low consumption.
This function monitors the speed of the pump. When the PI-controller has forced the speed of the pump to minimum according to the feedback
value, the pump stops after a set period of time. It remains stopped until the feedback value starts to drop and the PI-controller starts the pump
again.
• Enable Stop at min. speed
Enables the Stop at min. speed function.
• Delay
The delay time the pump must be running at minimum speed before it stops.
• Restart speed
Speed in percentage when the pump must start again, hysteresis. It must be set higher than the Minimum speed of the pump.
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English (GB)